Used Car Inspection Checklist Before Buying in

Buying a used car in the UK should be straightforward. It rarely is. Sellers describe cars as "well-maintained" and "driving beautifully", but the data tells a different story.

According to an analysis of 57 million DVSA test records, roughly one in five cars fails its MOT. That is approximately 12.5 million individual defects identified across the UK fleet in a single year: worn tyres, failing brakes, corroded bodywork, and more. Many of those cars are sitting on forecourts and driveways right now, waiting for a buyer who skipped the inspection.

A pre-purchase car inspection changes that. It puts a professional set of eyes on the vehicle before your money changes hands. This checklist walks you through exactly what to check, when to book a vehicle MOT inspection, and how to use the results to negotiate or walk away with confidence.

1. Start With the Vehicle's MOT History Before You Even View It

The DVSA publishes a free online MOT history tool at check-mot.service.gov.uk. You only need the registration number.

Here is what to look for:

Test dates and mileage at each test — a sudden drop in recorded mileage between tests is a red flag for clocking
Failure reasons — one failed brake test is worth noting; three in a row tells you something about how the car has been maintained
Advisories — items that were not severe enough to fail the car but were flagged as needing attention. If the same advisory appears across two or three consecutive years, it has likely never been fixed
Gaps in the test record — long periods without an MOT often mean the car was declared off-road (SORN) or was driven without a valid certificate

This step costs nothing and takes three minutes. Do it before you arrange a viewing.

2. Run a DVLA and History Check

A DVLA check confirms the car's make, model, year, and whether it is taxed or SORN. Cross-reference those details against the advert. If the seller says it is a 2018 model but the DVLA record shows 2016, ask questions before you go further.

Beyond the DVLA, a paid history check from a service such as Experian Autocheck or HPI reveals:

Outstanding finance (you inherit the debt if you buy without checking)
Write-off status (Category A, B, S, or N)
Whether the car has been reported stolen
Number of previous keepers

Some inspection providers cross-reference data from insurance companies, the police, and the DVLA as part of a pre-purchase inspection report.

3. Inspect the Bodywork in Daylight

Never view a used car in the dark or in wet weather that masks paint defects. Park the car on level ground and walk around it slowly.

Check for:

Uneven panel gaps — misaligned doors, bonnet, or boot lid can indicate accident repair
Paint colour mismatches — compare each panel to its neighbour in direct sunlight
Filler — run your hand over the bodywork and feel for ripples or soft spots
Rust — check the wheel arches, sills, door bottoms, and the area around the boot seal
Glass — chips and cracks in the windscreen can fail an MOT if they fall in the driver's line of sight

During a vehicle MOT inspection, the body structure and chassis are inspected for signs of corrosion, damage, and structural integrity. Load-bearing parts within a 30cm radius of each mounting point are examined closely for rust and other damage.

4. Check Under the Bonnet

You do not need to be a mechanic to spot warning signs under the bonnet. Open it and look.

Oil dipstick — pull it, wipe it, reinsert it, and pull again. Clean, honey-coloured oil is good. Black, gritty oil suggests it has not been changed in a long time. Creamy or frothy oil is a serious sign of a head gasket problem.

Coolant reservoir — the fluid should be at the correct level and a clean green, blue, or pink colour. Oily or rusty coolant raises concerns.

Battery terminals — look for white or blue corrosion around the terminals.

Fluid leaks — check the ground under the car for fresh oil, coolant, or brake fluid stains.

An MOT is not the same as a car service. A service checks the overall mechanical health of the engine, gearbox, and fluids. An MOT checks whether the car is safe and roadworthy right now against a fixed set of legal standards. A pre-purchase car inspection covers both areas, which is why it goes further than an MOT certificate alone.

5. Test the Tyres

Tyres are the single most common reason cars fail their MOT. Tyre tread below the legal limit is the most frequently logged defect across all MOT failures, accounting for just over 8% of all failure items.

Check each tyre for:

Tread depth — the legal minimum in the UK is 1.6mm across the central three-quarters of the tyre. Insert a 20p coin into the main grooves. If the outer rim of the coin is visible, the tyre is at or below the limit
Uneven wear — heavy wear on one edge points to suspension or alignment issues
Cuts, bulges, or cracks in the sidewall
Matching types — all four tyres should ideally be the same brand and specification. Mismatched tyres on the same axle are an MOT failure point

Do not forget the spare. A missing or flat spare is not an MOT failure, but it leaves you stranded.