What to Do Before a Vehicle Inspection

A vehicle inspection is designed to make sure that a car is safe to drive and meets the basic technical and environmental requirements set by the relevant authorities. Although inspection rules differ from one country to another, many of the items checked during an inspection are similar around the world.

A vehicle can fail inspection for something as simple as a defective light, worn tire, damaged windshield, excessive exhaust emissions, or a problem with the braking system. For this reason, spending a little time checking the vehicle before the inspection can prevent unnecessary delays and the need for a second inspection.

Check the Vehicle's Lights

Lighting is one of the easiest things to check before an inspection and one of the most common areas where problems can occur.

Check that all exterior lights are working properly, including:

• Low-beam headlights

• High beams

• Front and rear turn signals

• Brake lights

• Tail lights

• Rear fog light, where applicable

• Reverse lights

• License plate lights

• Hazard warning lights

Also check whether any headlight lens is severely cloudy, cracked, damaged, or allowing moisture to enter.

A headlight may still illuminate even when its beam pattern is incorrect. Therefore, if the headlights have recently been replaced, adjusted, modified, or repaired, checking their alignment can also be worthwhile.

Inspect the Tires

Tires are a major safety component and are commonly inspected.

Check the tread depth and look for obvious signs of damage such as:

• Cracks

• Bulges

• Cuts

• Uneven wear

• Exposed cords

• Severe sidewall damage

Make sure the tires are inflated to the manufacturer's recommended pressure.

Do not forget the spare tire if the vehicle is equipped with one. Depending on the country and inspection regulations, the condition of the spare tire or the presence of required tire equipment may also be checked.

If your vehicle uses different tire sizes on the front and rear, make sure the dimensions and specifications are appropriate for the vehicle.

Check the Braking System

Brakes are among the most important components examined during a vehicle inspection.

Before the inspection, pay attention to how the brake pedal feels. A pedal that feels unusually soft, spongy, or sinks excessively can indicate a problem with the braking system.

Also listen for unusual sounds such as grinding or severe metal-on-metal noises.

If the vehicle pulls strongly to one side when braking, this should also be investigated.

Check the visible condition of the brake discs and pads if possible. Excessive disc corrosion, severely worn pads, or damaged components can cause inspection problems as well as safety risks.

The parking brake should also operate correctly and hold the vehicle securely.

Check the Windshield and Other Glass

Inspect the windshield carefully for cracks and stone chips.

A small chip away from the driver's field of vision may not be a problem in some countries, while a crack in a critical area can result in an inspection failure.

Also check the side and rear windows for damage.

Make sure the windshield wipers operate correctly and that the rubber blades are not badly worn.

The windshield washer system should also work properly and provide adequate fluid to the glass.

Check the Wipers and Washer Fluid

Windshield visibility is essential for safe driving, which is why wipers and washers are commonly included in vehicle inspections.

Turn the wipers on at different speeds and make sure they move smoothly across the windshield.

Worn blades may leave:

• Streaks

• Unclean areas

• Water lines

• Large sections of untouched glass

Replace damaged or worn blades before the inspection.

Also make sure the windshield washer reservoir contains sufficient fluid and that the washer jets are not blocked.

Inspect the Mirrors

Check the interior rear-view mirror and exterior side mirrors.

They should be securely mounted and provide a clear view behind and beside the vehicle.

Cracked, severely damaged, or loose mirrors may create a safety problem and can result in an inspection failure depending on local regulations.

Check the Horn

The horn is easy to overlook because it is rarely used during normal driving.

Press the horn and make sure it works properly.

If there is no sound or the horn only works intermittently, have the electrical circuit, fuse, relay, or horn unit inspected.

Check the Seat Belts

Make sure every seat belt operates correctly.

Pull the belt out and check that it extends and retracts normally. Fasten it and verify that the buckle locks securely.

Inspect the belt webbing for cuts, severe fraying, burns, or other damage.

The seat belt warning system, where fitted and required, should also function correctly.

Never ignore a damaged seat belt simply because it still appears to lock. A damaged belt may not provide proper protection in a crash.

Check the Airbag Warning Light

Turn the ignition on and observe the dashboard warning lights.

The airbag or SRS warning light should normally illuminate briefly as part of the system self-check and then go out after the engine starts.

If the airbag warning light remains illuminated, the system may have detected a fault.

Do not attempt to hide or disable a warning light before an inspection. A persistent SRS warning can indicate a genuine safety problem that should be diagnosed properly.

Look for Dashboard Warning Lights

The same principle applies to other warning lights.

Before the inspection, check whether the dashboard shows warnings related to:

• Engine management

• ABS

• Electronic stability control

• Airbags

• Brake system

• Steering

• Tire pressure

• Charging system

• Oil pressure

A warning light does not automatically mean the vehicle will fail inspection everywhere, because regulations differ between countries. However, an illuminated safety-related warning should never be ignored.

If a warning light appeared recently, have the underlying problem diagnosed rather than simply clearing the fault code.

Check the Engine for Fluid Leaks

Look underneath the vehicle for signs of leaking fluid.

Common leaks include:

• Engine oil

• Coolant

• Transmission fluid

• Brake fluid

• Power steering fluid

• Fuel

A small stain does not necessarily mean that a vehicle will fail inspection, but significant leaks can create safety and environmental problems.

If you find a fresh or unexplained leak, determine its source before the inspection.

Check the Exhaust System

The exhaust system is important for both safety and emissions.

Listen for unusual exhaust noises and inspect the visible exhaust components for obvious damage, holes, loose parts, or excessive corrosion.

An exhaust leak can increase noise and may allow dangerous gases to enter the passenger compartment under certain conditions.

The catalytic converter and other emissions-control components should also be present and functioning as required.

Do not remove or bypass emissions-control equipment simply to prepare for an inspection.

Check Exhaust Emissions

Emissions testing is part of vehicle inspections in many countries.

A vehicle may produce excessive emissions because of problems involving:

• Oxygen sensors

• Fuel injectors

• Spark plugs

• Air-fuel mixture

• Catalytic converter

• EGR system

• Diesel particulate filter

• Engine management system

• Air intake leaks

If the vehicle has recently developed poor fuel economy, rough idling, excessive smoke, or a check-engine light, it is better to diagnose the problem before the inspection.

For diesel vehicles, excessive black, blue, or white smoke can also indicate an underlying mechanical or emissions-related problem.

Check the Suspension and Steering

Suspension and steering components play a major role in vehicle stability.

Pay attention to symptoms such as:

• Excessive bouncing

• Knocking noises

• Uneven tire wear

• Steering wheel vibration

• Excessive steering play

• Vehicle pulling to one side

• Difficulty keeping the vehicle straight

Worn shock absorbers, ball joints, tie rods, control-arm bushings, wheel bearings, and other suspension components may be identified during an inspection.

If you hear a new knocking sound from the suspension, have it checked before the inspection rather than waiting for the inspection center to identify it.

Check the License Plates

Make sure the license plates are securely mounted, clearly visible, and not excessively damaged.

They should not be covered by dirt, accessories, frames, or other objects that make the registration information difficult to read.

The exact requirements for plate size, location, font, mounting, and condition vary by country.

Check the VIN and Vehicle Identification Information

The vehicle identification number, commonly known as the VIN, is an important part of vehicle identification.

Make sure the VIN and other identification information are present and readable in the locations specified by the vehicle manufacturer.

Do not attempt to modify, repaint, remove, or interfere with identification markings.

Remove Unnecessary Modifications

Aftermarket modifications can create inspection problems if they affect safety, emissions, visibility, or vehicle identification.

Depending on local regulations, modifications involving the following areas may require particular attention:

• Window tint

• Headlights

• Exhaust systems

• Suspension height

• Wheels and tires

• Exterior body modifications

• Additional lighting

• Steering components

• Engine modifications

A modification that is legal in one country may not be permitted in another. If a vehicle has been heavily modified, check the local requirements before taking it for inspection.

Check the Fuel Cap

On many modern vehicles, the fuel cap and fuel system are part of the emissions-control system.

Make sure the fuel cap is installed correctly and seals properly.

A damaged or missing fuel cap can cause fuel vapors to escape and may trigger an emissions-related fault on some vehicles.

Make Sure the Required Equipment Is Present

Inspection requirements vary considerably around the world, but some countries require specific safety equipment to be carried in the vehicle.

Depending on local regulations, this may include items such as:

• Warning triangle

• First-aid kit

• Fire extinguisher

• Reflective vest

• Spare wheel

• Jack

• Wheel wrench

• Emergency equipment

Do not assume that equipment required in another country is also mandatory in your country. Check the applicable inspection rules for your vehicle and location.

Do Not Clear Fault Codes Just Before the Inspection

Using an OBD scanner to erase fault codes may make the dashboard warning light disappear temporarily, but it does not necessarily repair the underlying problem.

Modern vehicles use readiness monitors to determine whether certain emissions-related systems have completed their self-tests.

If fault codes are erased shortly before an emissions inspection, some monitors may show as incomplete. This can create another problem during testing.

The correct approach is to repair the underlying fault and allow the vehicle to complete the necessary drive cycles rather than simply clearing the codes.

Give the Vehicle a Basic Service If Necessary

If the vehicle is approaching its scheduled maintenance interval, it may be sensible to service it before the inspection.

An inspection is not the same thing as a routine service. However, checking the vehicle during a service can reveal problems that could otherwise cause an inspection failure.

Depending on the vehicle's condition, this may include checking:

• Engine oil

• Filters

• Brake components

• Suspension

• Steering

• Lights

• Tires

• Fluid levels

• Battery and charging system

Take the Vehicle for a Short Test Drive

A short test drive before the inspection can reveal problems that are difficult to notice while the vehicle is parked.

Pay attention to:

• Brake performance

• Steering response

• Suspension noises

• Gear changes

• Engine performance

• Warning lights

• Tire vibration

• Exhaust smoke

• Unusual sounds or smells

If something feels different from normal, investigate it before the inspection appointment.

Clean the Vehicle Before the Inspection

Cleaning the vehicle is not just about appearance.

A clean vehicle makes it easier to identify leaks, damaged components, worn tires, cracked lights, and other problems.

Clean the license plates, headlights, mirrors, windows, and exterior lighting.

Also remove unnecessary objects from the vehicle so that the inspection can be performed more easily.

What Should You Do the Day Before the Inspection?

The day before the inspection, perform a final basic check.

Make sure the tires have the correct pressure, all lights work, the windshield is in good condition, the wipers operate properly, the horn works, the seat belts function, and there are no obvious fluid leaks.

Check the dashboard for warning lights and make sure the required vehicle documents and equipment are available.

If the inspection includes an emissions test, avoid trying to solve a long-standing engine problem at the last minute. A proper diagnosis is much more useful than simply clearing fault codes or replacing random components.

The Best Way to Prepare for a Vehicle Inspection

Preparing for a vehicle inspection does not require replacing every component or performing an expensive service.

The most important thing is to identify obvious safety and maintenance problems before arriving at the inspection center.

Lights, tires, brakes, windshield, wipers, seat belts, warning lights, suspension, steering, exhaust, emissions, and fluid leaks deserve particular attention.

Inspection regulations are different from country to country, but the underlying principle is universal: a vehicle should arrive at the inspection center in a safe, properly maintained, and legally compliant condition.

A few minutes of checking before the appointment can save time, prevent an unnecessary inspection failure, and, more importantly, help ensure that the vehicle is safe for everyone on the road.