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P2080 Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1
P2080 Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1 is a generic OBD-II diagnostic trouble code indicating that the Engine Control Module (ECM/PCM) has detected a problem with the range or performance of the Exhaust Gas Temperature (EGT) sensor circuit for Bank 1 Sensor 1.
In simple terms, the engine computer is receiving an exhaust-temperature signal that is outside the expected range, implausible, or not responding as expected to changes in engine operating conditions.
The EGT sensor measures the temperature of exhaust gases and sends information to the ECM. Depending on the vehicle, this information can be used for:
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Engine protection
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Turbocharger protection
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Catalytic-converter protection
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Diesel particulate filter (DPF) regeneration
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Gasoline particulate filter (GPF) management
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Exhaust aftertreatment control
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Emissions management
When the signal from Bank 1 Sensor 1 does not match the expected temperature range or response pattern, the ECM may store P2080 and illuminate the Check Engine Light.
The exact location of Bank 1 Sensor 1 varies between manufacturers. It may be positioned near the exhaust manifold, turbocharger, catalytic converter, diesel oxidation catalyst, DPF, or another exhaust aftertreatment component.
What Does P2080 Mean?
The code description contains several important terms.
Exhaust Gas Temperature Sensor
An Exhaust Gas Temperature sensor measures the temperature of exhaust gases.
Many EGT sensors use a temperature-sensitive electrical element whose resistance changes as temperature changes. The ECM monitors this electrical characteristic and calculates an estimated exhaust temperature.
The temperature information may be used to determine whether the exhaust system is operating within a safe range.
Circuit Range/Performance
The "Range/Performance" portion of P2080 means the ECM believes the EGT sensor signal is not behaving within its expected operating parameters.
This does not necessarily mean the circuit is completely open or shorted.
The ECM may determine that:
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The temperature is too high for the current engine conditions.
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The temperature is too low for the current engine conditions.
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The temperature does not change when it should.
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The signal changes too slowly.
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The signal changes too quickly.
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The temperature is inconsistent with other sensors.
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The signal does not correspond to engine load, airflow, or exhaust conditions.
Therefore, P2080 does not automatically mean that the EGT sensor itself is defective.
Bank 1
Bank 1 is the engine bank containing cylinder number one.
On a V-type engine:
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Bank 1 = side containing cylinder #1
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Bank 2 = opposite side
Inline engines normally have only one cylinder bank.
Sensor 1
Sensor 1 identifies the sensor's position within the manufacturer's exhaust-system configuration.
It is important not to automatically assume that EGT Sensor 1 has exactly the same meaning as Sensor 1 for an oxygen sensor.
Depending on the vehicle, Bank 1 Sensor 1 may be located near:
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Exhaust manifold
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Turbocharger
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Catalytic converter
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Diesel oxidation catalyst
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DPF
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Other exhaust aftertreatment components
Always use vehicle-specific service information to determine the exact location.
How Does an EGT Sensor Work?
A typical EGT monitoring system works as follows:
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Exhaust gases heat the EGT sensor.
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The sensor's electrical characteristics change with temperature.
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The ECM monitors the sensor circuit.
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The ECM calculates an estimated exhaust temperature.
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The temperature is compared with expected values.
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The ECM may compare it with other temperature sensors.
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The information is used for engine protection and emissions management.
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If the reading becomes implausible or falls outside the expected operating behavior, P2080 may be stored.
EGT sensors operate in an extremely harsh environment.
They are exposed to:
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High exhaust temperatures
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Rapid thermal cycling
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Exhaust pressure
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Vibration
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Soot
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Moisture
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Corrosion
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Thermal expansion and contraction
These conditions can eventually damage the sensor or its electrical circuit.
Symptoms of P2080
Symptoms depend on the vehicle and the function assigned to Bank 1 Sensor 1.
Check Engine Light
The most common symptom is the Check Engine Light.
The vehicle may otherwise appear to operate normally.
Reduced Engine Performance
Some vehicles may activate a protective strategy when the ECM cannot rely on the EGT reading.
Possible symptoms include:
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Reduced engine power
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Reduced turbo boost
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Slower acceleration
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Limited engine speed
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Limp mode
These symptoms are not present on every vehicle.
Poor Fuel Economy
An incorrect EGT signal can interfere with engine or emissions-management strategies and may contribute to increased fuel consumption.
DPF Regeneration Problems
On diesel vehicles, EGT sensors can be critical for DPF regeneration.
The ECM needs to know whether the exhaust has reached the required temperature.
A faulty temperature signal can cause:
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Delayed regeneration
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Interrupted regeneration
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Failed regeneration
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Increased soot accumulation
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DPF warning messages
Turbocharger Protection Problems
Turbocharged engines may use EGT information to protect the turbocharger from excessive exhaust temperature.
An unreliable signal may cause the ECM to modify boost or activate a protective strategy.
Increased Emissions
Incorrect exhaust-temperature information can interfere with emissions-control strategies.
The vehicle may also fail an applicable emissions inspection while the fault remains active.
Abnormal EGT Readings
A scan tool may show:
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Extremely high temperature
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Extremely low temperature
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A fixed temperature
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Slow temperature changes
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Sudden temperature changes
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A reading inconsistent with other sensors
No Noticeable Symptoms
P2080 can sometimes occur without obvious drivability problems.
The only symptom may be an illuminated Check Engine Light.
Common Causes of P2080
Faulty EGT Sensor
A defective EGT sensor is a common cause.
Possible sensor problems include:
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Incorrect resistance
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Signal drift
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Slow response
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Internal electrical failure
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Incorrect temperature output
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Aging sensor performance
Damaged EGT Sensor Wiring
The wiring near the exhaust is exposed to extreme heat and vibration.
Possible problems include:
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Melted insulation
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Brittle insulation
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Broken conductors
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Chafing
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Pinched wires
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Wiring touching the exhaust
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Poor previous repairs
Heat-Damaged Wiring
Repeated exposure to high temperatures can damage the insulation and electrical conductors.
This can change circuit resistance and cause the ECM to interpret the temperature incorrectly.
Corroded Connector
Moisture, road spray, road salt, and condensation can cause connector corrosion.
This can increase electrical resistance and alter the sensor signal.
Loose Connector
A connector that is not fully secured can create an unstable electrical connection.
Poor Terminal Contact
A terminal may look clean but still have insufficient contact tension.
This can create:
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High resistance
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Signal instability
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Incorrect EGT readings
Open or High-Resistance Circuit
An open circuit or excessive resistance can cause the ECM to calculate an incorrect exhaust temperature.
Short to Ground
A short to ground can alter the sensor signal and cause an implausible reading.
Exhaust Leak
An exhaust leak can change exhaust conditions around the sensor and affect temperature measurements.
Excessive Exhaust Temperature
P2080 can sometimes be associated with a sensor that is correctly reporting a genuinely abnormal exhaust temperature.
Possible causes include:
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Engine misfire
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Rich mixture
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Lean mixture
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Incorrect ignition timing
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Incorrect injection timing
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Fuel injector problems
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Turbocharger problems
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Exhaust restriction
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DPF regeneration problems
This distinction is extremely important.
The sensor may be working correctly while reporting a real exhaust-temperature problem.
Engine Misfire
A misfire can send unburned fuel into the exhaust and cause a significant increase in exhaust temperature.
This can potentially damage:
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EGT sensor
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Catalytic converter
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DPF
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Turbocharger
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Other exhaust components
Fuel Injector Problems
A leaking, stuck, or incorrectly operating fuel injector can alter combustion and exhaust temperature.
Exhaust Restriction
A restricted:
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Catalytic converter
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DPF
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GPF
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Exhaust pipe
can change exhaust pressure and temperature.
DPF Problems
On diesel vehicles, excessive DPF loading or abnormal regeneration can produce unusual exhaust-temperature conditions.
Turbocharger Problems
Turbocharger or boost-control problems can change airflow, combustion, and exhaust temperature.
Possible causes include:
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Wastegate problems
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Variable-geometry turbo problems
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Boost-control faults
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Turbocharger damage
ECM/PCM Problem
An ECM/PCM input problem is possible, but it is generally less common than a sensor, wiring, or connector problem.
Software or Calibration Problem
Some vehicles may have manufacturer-specific software or calibration issues affecting EGT monitoring.
A software or calibration update may be available.
Vehicles Commonly Affected by P2080
P2080 can occur on vehicles equipped with EGT sensors and multi-bank exhaust or aftertreatment systems.
Examples include:
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Ford F-150
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Ford Super Duty
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Ford Explorer
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Ford Expedition
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Chevrolet Silverado
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Chevrolet Tahoe
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Chevrolet Suburban
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GMC Sierra
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GMC Yukon
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Ram 1500
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Ram 2500
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Ram 3500
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Jeep Grand Cherokee
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Jeep Wrangler
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BMW X5
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BMW X6
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Mercedes-Benz GLE
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Mercedes-Benz G-Class
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Audi Q7
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Volkswagen Touareg
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Porsche Cayenne
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Land Rover Discovery
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Range Rover
This list is not exhaustive.
P2080 can occur on different engines and exhaust configurations, and the exact function and location of Bank 1 Sensor 1 depend on the manufacturer.
How Is P2080 Diagnosed?
A proper diagnosis should determine whether the fault is caused by:
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A defective EGT sensor,
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A wiring or connector problem, or
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A genuine abnormal exhaust temperature.
The EGT sensor should not automatically be replaced simply because P2080 is stored.
Step 1: Scan for Additional Trouble Codes
Use a suitable diagnostic scan tool and record:
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Stored codes
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Pending codes
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History codes
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Manufacturer-specific codes
Look for related codes involving:
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EGT sensors
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DPF
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Catalytic converter
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Exhaust pressure
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Turbocharger
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Fuel system
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Misfires
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Air-fuel mixture
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Aftertreatment
Additional codes can help identify the root cause.
Step 2: Check Freeze-Frame Data
Review the operating conditions when P2080 was stored.
Important information may include:
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Engine RPM
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Engine load
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Vehicle speed
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Coolant temperature
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Intake air temperature
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Battery voltage
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EGT temperature
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DPF status
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Regeneration status
Determine whether the fault occurred during:
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Cold start
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Warm-up
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Cruising
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Acceleration
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Heavy engine load
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Deceleration
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DPF regeneration
Step 3: Identify Bank 1 Sensor 1
Use manufacturer-specific service information to determine the exact physical location.
Verify:
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Sensor position
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Connector
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Wiring
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Circuit designation
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Sensor type
Do not assume the location is identical between different manufacturers.
Step 4: Monitor Live EGT Data
Use a scan tool to monitor Bank 1 Sensor 1.
Look for:
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Implausibly high readings
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Implausibly low readings
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Fixed readings
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Slow response
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Sudden changes
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Readings inconsistent with engine conditions
Step 5: Compare Other EGT Sensors
If the vehicle has multiple EGT sensors, compare their readings under similar operating conditions.
A major unexplained difference can help identify a sensor or circuit problem.
However, EGT sensors located at different points in the exhaust system can legitimately show different temperatures.
Use manufacturer specifications when determining whether the difference is abnormal.
Step 6: Inspect the EGT Sensor
Inspect Bank 1 Sensor 1 for:
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Physical damage
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Burn marks
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Cracks
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Corrosion
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Contamination
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Loose installation
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Heat damage
Step 7: Inspect the Connector
Check for:
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Corrosion
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Bent pins
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Loose terminals
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Spread terminals
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Backed-out terminals
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Water intrusion
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Melted housing
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Broken locking tabs
Step 8: Inspect the Wiring Harness
Trace the EGT sensor wiring toward the ECM.
Look for:
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Melted insulation
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Brittle insulation
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Chafing
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Broken wires
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Pinched wiring
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Loose harness clips
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Wiring touching hot exhaust components
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Poor previous repairs
Pay particular attention around:
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Exhaust manifold
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Turbocharger
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Catalytic converter
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DPF
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Exhaust pipe
Step 9: Check Circuit Resistance
Depending on the sensor design, measure circuit resistance according to the manufacturer's procedure.
High resistance can cause the ECM to calculate an incorrect exhaust temperature.
Step 10: Check Sensor Resistance
If specified by the manufacturer, measure the sensor's resistance at a known temperature.
Compare the result with the manufacturer's specifications.
There is no single universal EGT sensor resistance value for every vehicle.
Step 11: Check Circuit Continuity
Test the circuit for:
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Open circuits
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High resistance
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Short circuits
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Poor connections
Use the vehicle-specific wiring diagram.
Step 12: Check Reference or Supply Voltage
Depending on the sensor design, verify the expected reference or supply voltage.
Do not assume that every EGT sensor uses the same electrical configuration.
Step 13: Check Ground or Return Circuit
Where applicable, verify:
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Ground/return continuity
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Voltage drop
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Circuit integrity
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Connector condition
Step 14: Check the Signal Circuit
Monitor the EGT signal while exhaust temperature changes.
The signal should respond predictably according to the manufacturer's specifications.
A signal that changes abnormally without a corresponding physical temperature change can indicate a sensor or circuit problem.
Step 15: Check Cold-Start Plausibility
When the engine is completely cold, compare the Bank 1 Sensor 1 reading with:
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Ambient temperature
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Intake air temperature
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Coolant temperature
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Other relevant temperature sensors
A major unexplained discrepancy can indicate a sensor or circuit problem.
Step 16: Check for Heat-Related Problems
Some EGT range/performance faults only appear when the exhaust system becomes hot.
Compare sensor behavior:
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Cold
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During warm-up
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At operating temperature
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After heat soak
If the reading becomes abnormal only when hot, inspect the sensor and wiring around the exhaust.
Step 17: Determine Whether Exhaust Temperature Is Actually Abnormal
If the electrical circuit checks out, investigate whether the exhaust temperature is genuinely abnormal.
Possible causes include:
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Engine misfire
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Fuel injector problems
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Fuel pressure problems
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Rich mixture
-
Lean mixture
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Ignition timing problems
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Injection timing problems
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Turbocharger faults
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Exhaust restriction
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DPF regeneration problems
Step 18: Check DPF and Aftertreatment
On applicable diesel vehicles, inspect:
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DPF loading
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Regeneration status
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Regeneration history
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Differential pressure
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EGT readings
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Related aftertreatment codes
Step 19: Inspect the Exhaust System
Check for:
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Exhaust leaks
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Damaged exhaust pipes
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Restricted catalytic converter
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Restricted DPF
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Damaged GPF
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Turbocharger-related exhaust problems
Step 20: Check Manufacturer Service Information
Look for:
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Technical Service Bulletins
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Known EGT sensor failures
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Wiring harness problems
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Connector issues
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Heat-related failures
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ECM software updates
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Calibration updates
Step 21: Perform Required Adaptation or Relearn
Some vehicles may require an adaptation reset or relearn after replacing an EGT sensor.
Follow the manufacturer's service procedure.
How to Fix P2080
The correct repair depends on the actual cause of the fault.
Replace the Faulty EGT Sensor
If testing confirms that Bank 1 Sensor 1 is defective, replace it with the correct sensor specified for the vehicle.
Repair Damaged Wiring
Repair or replace wiring damaged by:
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Heat
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Chafing
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Vibration
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Corrosion
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Broken conductors
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Poor previous repairs
The repaired harness should be routed and secured away from excessive exhaust heat.
Repair or Replace the Connector
If the connector has:
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Corroded terminals
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Loose terminals
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Poor terminal tension
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Melted housing
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Water intrusion
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Broken locking hardware
repair or replace the affected components.
Repair Exhaust Leaks
Repair exhaust leaks that affect the sensor or contribute to abnormal exhaust conditions.
Correct Excessive Exhaust Temperature
If the exhaust temperature is genuinely too high, repair the underlying cause.
Possible causes include:
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Engine misfire
-
Fuel injector failure
-
Incorrect fuel pressure
-
Rich or lean operation
-
Ignition timing problems
-
Injection timing problems
-
Turbocharger faults
-
Exhaust restriction
Repair DPF or Aftertreatment Problems
On applicable diesel vehicles, repair faults involving:
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DPF regeneration
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Excessive DPF loading
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Differential pressure
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Exhaust temperature management
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Aftertreatment components
Repair Turbocharger Problems
If a turbocharger or boost-control fault is responsible for abnormal exhaust temperatures, repair the underlying problem.
Update or Reprogram the ECM
If manufacturer service information identifies a software or calibration issue, perform the applicable update.
Replace the ECM/PCM
ECM/PCM replacement should generally be the last step.
Before replacing the module, verify:
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EGT sensor
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Sensor connector
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Wiring
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Reference/supply circuit
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Ground/return circuit
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Signal circuit
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Resistance
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Continuity
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Exhaust condition
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Engine operation
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DPF/aftertreatment operation
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Software/calibration
What Happens If P2080 Is Ignored?
Ignoring P2080 can lead to:
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Check Engine Light remaining illuminated
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Incorrect exhaust-temperature monitoring
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Increased emissions
-
Poor fuel economy
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Reduced engine performance
-
Limp mode on some vehicles
-
DPF regeneration problems
-
Increased DPF soot loading
-
Aftertreatment problems
-
Reduced turbocharger protection
If the EGT sensor is reporting an incorrect temperature, the ECM may not be able to apply the correct protection strategy.
If the exhaust is genuinely too hot, continued operation can potentially damage:
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Turbocharger
-
Catalytic converter
-
DPF
-
GPF
-
Other exhaust components
Can You Drive With P2080?
Short-term driving may be possible if the vehicle operates normally and the Check Engine Light is steady, but P2080 should be diagnosed promptly.
The vehicle may initially drive normally even when the EGT signal is incorrect.
Extra caution is appropriate on diesel vehicles where EGT sensors are involved in DPF regeneration or aftertreatment control.
Avoid continued driving if the vehicle develops:
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Severe power loss
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Limp mode
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Excessive smoke
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Strong exhaust smell
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Abnormal turbocharger noise
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Severe misfire
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Overheating
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Flashing Check Engine Light
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Other serious warning lights
A flashing Check Engine Light or severe engine-running problem should be treated as an urgent condition.
Is P2080 a Serious Code?
P2080 is generally considered a moderate-severity diagnostic trouble code, but its actual seriousness depends on the underlying cause.
A defective sensor, damaged wire, or connector problem may be relatively straightforward to repair.
However, if P2080 is caused by:
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Excessive exhaust temperature
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DPF restriction
-
Turbocharger problems
-
Severe misfire
-
Fuel-system problems
-
Exhaust aftertreatment faults
the underlying problem can be considerably more serious.
P2080 vs. Related EGT Codes
| Code | General Description |
|---|---|
| P2080 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1 |
| P2081 | Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 1 |
| P2082 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1 |
| P2083 | Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 1 |
| P2084 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2 |
| P2085 | Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 2 |
| P2086 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2 |
| P2087 | Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 2 |
The important distinction is that P2080 identifies a range/performance problem, while P2081 identifies an intermittent circuit problem involving the same Bank 1 Sensor 1 EGT sensor.
Similarly, P2082/P2083 concern Bank 2 Sensor 1, while P2084/P2085 and P2086/P2087 concern the respective Sensor 2 positions.
Important: Exact EGT sensor locations, sensor types, electrical specifications, and diagnostic strategies vary by manufacturer. Vehicle-specific service information should always be used before testing or replacing the sensor.
How to Prevent P2080
Regular maintenance can reduce the risk of EGT sensor and exhaust-system problems.
Recommended practices include:
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Maintain the engine according to manufacturer recommendations.
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Use the correct engine oil and filters.
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Maintain the fuel system properly.
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Repair engine misfires immediately.
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Repair exhaust leaks promptly.
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Keep EGT sensor wiring away from excessive heat.
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Ensure the exhaust harness is correctly secured.
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Keep electrical connectors clean and dry.
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Maintain DPF and aftertreatment systems where applicable.
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Address turbocharger problems promptly.
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Avoid unauthorized exhaust modifications.
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Avoid poorly installed tuning modifications.
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Keep ECM software updated when applicable.
-
Address recurring Check Engine Light warnings promptly.
Final Thoughts
The P2080 Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1 diagnostic trouble code indicates that the ECM/PCM has detected that the EGT sensor signal from Bank 1 Sensor 1 is outside its expected operating range or is not behaving correctly.
Common causes include:
-
Faulty EGT sensor
-
Damaged wiring
-
Heat-damaged wiring
-
Corroded connector
-
Loose terminals
-
High circuit resistance
-
Open or shorted circuit
-
Exhaust leaks
-
Genuine excessive exhaust temperature
-
Engine misfire
-
Fuel-system problems
-
Turbocharger problems
-
DPF or aftertreatment problems
-
ECM/software issues
The most important diagnostic question is whether Bank 1 Sensor 1 is reporting an incorrect temperature or the exhaust temperature is genuinely abnormal.
A proper diagnosis should begin with stored and pending trouble codes, freeze-frame data, live EGT readings, sensor inspection, connector inspection, wiring tests, and comparison with other relevant temperature sensors.
If the electrical circuit is healthy, the engine and exhaust system should then be checked for genuine temperature abnormalities.
P2080 should not be diagnosed simply by replacing the EGT sensor without testing. A misfire, fuel-system fault, turbocharger problem, exhaust restriction, or DPF regeneration issue may be the actual cause and could result in more serious damage if ignored.
