What do they check in a car inspection? A Complete Guide

A car inspection checks brakes, tyres, lights, engine fluids, emissions, battery, and safety components to confirm the vehicle is roadworthy and compliant.

Most people do not know what to expect before their car goes in for inspection. Whether it is your first time or you just want to be prepared, knowing what gets checked helps you avoid surprises, understand your results, and reduce the chance of a failed test.

This guide covers what they check for in a car inspection, what happens if something fails, how long the process takes, and how much it typically costs. We also look at how AI is changing the way vehicle inspections work, particularly for insurance and fleet use cases.

Quick Car Inspection Checklist

• Brakes
• Tyres
• Lights
• Engine fluids
• Battery
• Emissions
• Suspension
• Interior safety

If you need a detailed breakdown of every component inspected across all vehicle types, view our 222-point vehicle inspection checklist. 

Types of Car Inspections

Not all car inspections are the same. The type of inspection you need depends on your situation: buying a used car, renewing your insurance, passing a legal test, or checking in a fleet vehicle.

In the UK, the MOT test is mandatory for any car that’s over three years old. In the US, requirements vary state to state, with some states requiring annual safety and emissions checks and others requiring neither. For vehicle inspection for insurance purposes, insurers typically require a photo or physical inspection before issuing coverage on a used car or a lapsed policy.

What Do They Check in a Car Inspection?

A standard safety inspection covers eight main areas. Here is what an inspector looks at in each one.

1. Brakes - The inspector checks brake pad depth, rotor or drum condition, and brake fluid level. They also test how the brakes respond under pressure. Worn pads, scored rotors, or a spongy brake pedal are common reasons for a failed test. Most safety standards require a minimum pad depth of 2mm, though anything under 3mm is considered worn.
2. Tyres - When inspecting tyres, they check for tread depth, sidewall condition, and inflation pressure. In the UK, the legal minimum tread depth is 1.6mm across the central three-quarters of the tyre. The requirements vary for every state in the USA, but most states use the same 2/32 inch (1.6mm) standard. Bulges, cuts, or uneven wear will typically result in a fail.
3. Lights - Headlights, brake lights, indicators, reverse lights, and hazard lights i.e., every external light is inspected. A single fused bulb is enough to fail an MOT in the UK. The inspector also checks that headlights are aimed correctly and not misaligned, which can dazzle oncoming drivers.
4. Engine Fluids - Engine oil, coolant, brake fluid, power steering fluid, and windscreen washer fluid are all checked for level and visible contamination. Low or dirty fluids do not always cause an immediate fail, but they indicate a maintenance problem that may affect other inspected components.
5. Battery - The battery is tested for charge, voltage output, and its physical condition. A battery that cannot hold charge is at risk of breaking down and may affect internal electronic components. Most inspections flag batteries when they are below a minimum voltage threshold or have visible corrosion on the terminals.
6. Emissions - An OBD-II scan checks whether the engine management system is reporting any fault codes related to emissions. For older vehicles, a tailpipe test measures the actual exhaust output against the legal limit. Diesel vehicles are also tested for particulate matter. Failing the emissions test is one of the most common reasons for a rejection in states and countries with mandatory emissions checks.
7. Suspension and Steering - The inspector checks for worn bushings, damaged shock absorbers, and play in the steering column. A vehicle with worn suspension will handle poorly and may pull to one side under braking. Excessive play in the steering wheel is also a common fail point.
8. Interior Safety - Interior safety includes testing the Seat belts for secure fastening and retraction, the horn for proper function, and the windscreen for chips or cracks in the driver's line of sight. The inspector also checks if the wipers clear the screen and that the mirrors are intact and correctly positioned.

What Happens If Your Car Fails Inspection?

Failing a car inspection does not mean the car is immediately off the road in most cases. The process is straightforward.

1. You receive a list of the specific items that failed.
2. You arrange for the necessary repairs at a garage of your choice.
3. You return for a re-test, either at the same centre or a different one.
4. A pass certificate is issued once all failed items are resolved.

Analysis of over 57 million DVSA test records by MOT Data UK shows that roughly 1 in 5 cars fail their MOT on the first attempt. Lighting faults are the single most common reason, accounting for around 1 in 5 failed tests according to DVSA data cited by Car.co.uk. A quick check of all exterior lights before your appointment can prevent the most avoidable retest in the list.

Re-inspection fees vary by location. In the UK, retests after an MOT failure are often offered at a lowerrate by the same testing centre if done within a pre-defined timeframe. In the US, state inspection retests typically cost the same as the original test or are free for a limited window.

How Long Does a Car Inspection Take?

The time varies depending on what type of inspection you need. A basic safety check is faster than a combined safety and emissions test, and a pre-purchase inspection on a used car takes significantly longer.

As a general guide: a basic safety inspection takes 30 to 45 minutes, an emissions test adds 15 to 30 minutes on top of that, and a full pre-purchase inspection on a used car can take 1 to 3 hours. If you are using an AI-powered digital inspection for insurance or fleet purposes, the vehicle capture process takes 2 to 3 minutes and a condition report is generated in approximately 90 seconds.

How Much Does a Car Inspection Cost?

Costs vary by inspection type, location, and whether the check is mandatory or privately arranged.

AI-powered inspections for insurance and fleet use cases cost a fraction of the cost of a physical field visit. Inspektlabs data shows that AI-powered vehicle inspection reduces cost per inspection by up to 90% compared to sending a field inspector. For insurers and fleet operators running high volumes, this difference has a significant effect on annual operating costs.

How to Prepare Your Car for Inspection

A few simple checks before your appointment can save you the time and cost of a failed test.

• Check all exterior lights. Walk around the car at night and confirm headlights, brake lights, indicators, and reverse lights are working. A blown bulb is one of the most common and avoidable fail reasons.
• Top up engine fluids. Check engine oil, coolant, brake fluid, and windscreen washer fluid. Low washer fluid will not cause a fail in most jurisdictions, but low brake fluid or coolant may flag a deeper issue.
• Check tyre pressure. Set tyre pressure to the manufacturer's recommended level, which you can find on a sticker inside the driver's door frame or in the owner's manual. Incorrect pressure affects handling and can indicate a slow puncture.
• Check for dashboard warning lights. If any warning lights are active when the engine is running, the inspector will see them. Common culprits include the engine management light, the tyre pressure warning, and the battery light.
• Clean the number plate and windscreen. A plate that cannot be read clearly may trigger a fail in some jurisdictions. Chips or cracks in the windscreen in the driver's direct line of sight are also a common fail point.
• Bring the right documents. For most inspections, you will need your vehicle registration document and a valid ID. For insurance inspections, have your policy details ready too.

How AI Is Changing Car Inspections

Traditional vehicle inspections come with a few persistent problems. For example, Human inspectors vary in thoroughness; scheduling and travel add time; and paper reports get lost or disputed. For insurers and fleet operators managing hundreds or thousands of vehicles, these problems multiply quickly.

AI-powered vehicle inspection addresses each of these directly.

External damage detection. Inspektlabs' AI is trained on over 10 million vehicle images. It identifies dents, scratches, panel misalignment, and paint defects from photos and video captured on a smartphone. The AI applies the same detection criteria to every submission, removing the variability that comes with different human inspectors.

Hidden damage prediction. Beyond surface damage, the AI also analyses panel alignment and other visual indicators to flag areas that may have underlying structural damage often missed by the naked eye. This is particularly relevant for post-accident inspections and pre-purchase assessments.

Instant report generation. A full condition report is generated in approximately 90 seconds from the point of media submission. The report is timestamped, tamper-proof, and includes damage classification and estimated repair costs. There is no waiting for a physical inspector to write up their notes.

In practice, this is how the technology is being used:

• Insurance pre-coverage inspection. Instead of scheduling a field inspector for break-in renewals or high-risk profiles, insurers send the customer a guided capture link. The customer photographs the vehicle in 2 to 3 minutes. The insurer receives a verified condition report almost immediately.
• Fleet check-in and check-out. Fleet operators use AI-powered vehicle inspections to track vehicle condition at the start and end of every trip. Any damage that occurs during the trip is flagged automatically, creating a clear record for accountability and maintenance scheduling.
• Pre-purchase inspection for used cars. Buyers and lenders use AI-generated reports to verify a vehicle's condition remotely before committing to a purchase or loan. The report serves as a verifiable baseline that both parties can reference.

If you manage vehicles at scale, see how Inspektlabs automates vehicle inspection for insurers and fleet managers on the Inspektlabs damage detection page.

A car inspection is not something to worry about if you know what to expect. The checks cover the components that matter most for safety and roadworthiness: brakes, tyres, lights, engine fluids, suspension, and emissions. A few basic checks before your appointment can prevent most common fails.

For insurers, fleet operators, and dealers who need to run inspections at scale, AI-powered inspection is changing both the speed and the reliability of the process. What used to take days now takes minutes, with a consistent and auditable output every time.

For more on how digital inspection works in practice, visit inspektlabs.com or get in touch with the team.

Frequently Asked Questions

1. What do they check in a car inspection?
   A standard car inspection checks brakes, tyres, lights, engine fluids, battery, emissions, suspension, and interior safety components including seat belts, wipers, and horn. The exact checklist depends on the type of inspection and the jurisdiction, but these eight areas are covered in most standard roadworthiness tests.
2. Do they check the battery during a car inspection?
   Yes. The battery is tested for charge level, voltage output, and physical condition. A battery that cannot hold adequate charge, or one with heavy corrosion on the terminals, may be flagged during the inspection. It will not always result in a fail, but it indicates a vehicle that is at risk of breaking down.
3. What happens if my car fails inspection?
   You receive a written list of the items that failed. You arrange for the necessary repairs, then return for a re-test. Most testing centres offer a reduced retest fee if you return within a set number of days. Brake issues, blown lights, and emissions failures are the most common reasons for a fail.
4. Does a car inspection check the engine?
   Inspectors check engine fluids, the engine management warning light, and emissions output from the engine. They do not dismantle the engine or carry out a mechanical rebuild assessment. A pre-purchase inspection by a specialist mechanic is the appropriate option if you need a detailed assessment of engine internals.
5. Is a car inspection the same as a service?
   No. A car inspection assesses whether the vehicle meets roadworthiness or insurance standards. A service replaces consumable parts like oil, filters, and spark plugs to maintain the vehicle's mechanical health. A car can pass an inspection and still be overdue for a service.
6. How long does a car inspection take?
   A basic safety inspection takes 30 to 45 minutes. Adding an emissions test brings the total to 45 to 75 minutes. A comprehensive pre-purchase inspection on a used car takes 1 to 3 hours. An AI-powered digital inspection for insurance or fleet purposes takes under 5 minutes from the vehicle owner's side.
7. What do they check for in a car insurance inspection?
   A vehicle inspection for insurance focuses on documenting the vehicle's existing condition before a policy is issued. The inspector or AI system checks for visible external damage, records the vehicle's mileage and identification details, and confirms the vehicle matches the description provided at the point of application. The goal is to establish a verified baseline that protects both the insurer and the policyholder.