Buying guide · 12 min read

The complete used-car checklist (2026)

Buying a used car is 90% inspection, 10% negotiation. If you know what to look at — and in what order — you'll spot the £500 problems before they become £5,000 problems. This is the checklist we use ourselves, split into six passes you can do in about 45 minutes.

Written by the VehicleFaults Research Team

1. Paperwork first (before you touch the car)

Half of used-car scams collapse before you turn a wheel. Do these five things while you're still on the phone or standing next to the vehicle.

  • V5C logbook: registered keeper's name and address must match the seller and their photo ID.
  • MOT history at gov.uk/check-mot-history — look for repeat advisories on the same component.
  • HPI / vehicle history check for outstanding finance, write-off markers and mileage discrepancies.
  • Service book stamps or digital service history — gaps over 12k miles are a red flag.
  • VIN on the V5C matches the VIN on the dashboard plate and the engine bay plate.

2. Cold-start check (arrive early)

Ask the seller not to warm the car up before you arrive. A cold start hides nothing.

  • Engine turns over cleanly on the first crank, no extended cranking.
  • No blue, black or white smoke from the exhaust on start-up.
  • Idle settles within 30 seconds and stays smooth.
  • No warning lights left on after the bulb check completes.
  • Listen for tapping, ticking or knocking from the top end.

3. Walk-around exterior

Do this in daylight, not under showroom lights. Panel gaps and paintwork tell you the accident history the seller won't.

  • Panel gaps even and consistent front-to-back on both sides.
  • Paint finish matches across every panel — mismatched shades = respray = repair history.
  • Tyres: 3mm+ tread, no cracks, matched brands on the same axle, matching sizes to the V5C.
  • Windscreen: no chips in the driver's line of sight, no long cracks.
  • Lights: all working, lenses not fogged or cracked.
  • Underneath: no fresh oil, coolant or fuel drips on the ground.

4. Interior & electronics

Modern cars die from electrical faults, not mechanical ones. Test every switch.

  • Every window up and down, both from driver's door and individual switches.
  • Air-con blows cold within 60 seconds, heater blows hot after 3 minutes.
  • All seatbelts extend and retract smoothly.
  • Infotainment boots without errors, reversing camera works if fitted.
  • Steering wheel controls, cruise control and indicator stalks all functional.
  • Interior wear matches the mileage — worn seat bolster on a 30k car = clocked.

5. The test drive

20 minutes minimum, mixed roads. You're looking for how the car behaves, not just whether it goes.

  • Cold clutch bite point normal, no juddering, no slipping under load.
  • Gearbox: every gear engages cleanly, no crunching or notchiness.
  • Brakes pull up straight, no pulsing through the pedal, no squealing.
  • Steering wheel is centred on a straight road, no vibration at 50-70 mph.
  • Suspension quiet over potholes — no knocks or clunks.
  • Warning lights stay off through the whole drive.
  • Re-check for smoke on a hard acceleration from low revs.

6. Model-specific known faults

Every model has 2-3 signature problems. Look them up before you go. Our library covers 120+ popular models — check the common faults page for the exact make and model, then verify each known issue during your walk-around.

7. Negotiate from evidence, not opinion

Every defect you found is worth money off. Total the estimated repair cost, add 20% for what you didn't spot, and open there. Walk if the seller won't move on genuine faults — there's always another car.

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Frequently asked questions

How long should a used-car inspection take?

Budget 45-60 minutes for the checklist plus a 20-minute test drive. Anything shorter and you're missing steps. A dealer trying to rush you is a red flag on its own.

Should I pay for a professional pre-purchase inspection?

For cars over £8,000 or high-mileage examples, yes — an AA or RAC inspection costs £200-£280 and regularly saves buyers ten times that. For cheaper cars, this checklist plus an HPI check covers 90% of the risk.

What's the single most missed check?

The cold start. Sellers warm the car up before viewings to hide smoky starts, rough idle and glow-plug issues on diesels. Insist on hearing it cold.

How do I check for hidden accident damage?

Look at panel gaps first — they should be even and symmetrical. Then check paintwork under natural light for mismatched shades or orange-peel texture. A paint depth gauge (£20) confirms it in 30 seconds.

Is a full service history worth paying extra for?

Yes — a documented, gap-free service history typically adds 10-15% to a car's resale value and is the single strongest signal that the previous owner cared about maintenance.

Can I use this checklist for buying from a dealer?

Absolutely. Dealer cars come with consumer protection but plenty still have undisclosed faults. Run the same checklist and use anything you find as leverage on price or warranty terms.