Checking a Used Car’s MOT History Before You Buy (and How to Spot a Clocked Car)

Buying a used car is one of the biggest purchases most people make, yet thousands of buyers hand over the cash without doing the one free check that could save them thousands: reading the car’s full MOT history. Every MOT test a car has ever had in England, Scotland and Wales is recorded by the DVSA — including the mileage logged at each test. That record is public, free, and it tells you things no seller ever will.

Here’s exactly what to look for, and the red flags that should make you walk away.

Why the MOT history matters so much

A car’s MOT history is effectively its medical record. It shows you:

• Mileage at every test — the single best way to spot a “clocked” car (one with the odometer wound back).
• Every pass, fail and advisory — recurring problems, neglected faults, and what’s likely to go wrong next.
• Whether the seller is telling the truth — about mileage, service history and the car’s general condition.

Red flag 1: Mileage that doesn’t add up (clocking)

“Clocking” — winding back the odometer to make a car look less used — is illegal to sell on, but shockingly common. With digital dashboards it can be done in minutes with cheap equipment, and it can add thousands to a car’s price. The MOT history is your best defence.

Every MOT test records the mileage on the day. Plot those numbers in order and they should only ever go up, by a sensible amount each year (the UK average is around 7,000–9,000 miles a year). Watch for:

• Mileage that drops between two tests — a near-certain sign of clocking. A car cannot un-drive miles.
• A sudden flat spot — e.g. 15,000 miles a year for four years, then only 1,000 miles a year right before sale.
• A big jump then a stall — sometimes used to disguise a wind-back further back in the history.

Red flag 2: The same advisory, year after year

Advisories are the tester’s way of saying “this passed today, but keep an eye on it.” One or two is normal. But the same advisory appearing three years running tells you the owner has been ignoring a known problem. Common examples:

• “Brake disc worn, pitted or scored” appearing repeatedly — expensive brake work has been put off.
• “Oil leak, but not excessive” every year — a leak that’s slowly getting worse.
• “Corrosion” advisories — rust never improves on its own, and structural corrosion can be a future MOT failure or a write-off.

Red flag 3: A pattern of fails and re-tests

The odd MOT fail is normal — even well-kept cars fail on a blown bulb. What you’re looking for is a pattern: multiple major failures, or the same component failing more than once. That points to a car that’s been run on a shoestring.

Red flag 4: Gaps in the MOT history

If a car has missing years with no MOT recorded, ask why. It might have been declared SORN (off the road) for a good reason — or it might have been sitting unused, deteriorating, or rebuilt after damage. A gap isn’t automatically bad, but it’s always worth a question.

How to check a used car’s MOT history (step by step)

1. Get the registration plate from the advert or the seller.
2. Enter it into the MOTMate vehicle checker.
3. Read down the mileage column — confirm it only ever rises, by sensible amounts.
4. Open each test and read the advisories and failures — look for repeats and anything safety-related.
5. Cross-check the make, model, colour and fuel type against the actual car and the advert.
6. Check the current tax and MOT expiry dates so you know what you’ll need to sort on day one.

What the MOT history won’t tell you

The MOT history is powerful, but it isn’t everything. It won’t show:

• Outstanding finance — whether money is still owed on the car (use a paid HPI-style check for this).
• Insurance write-offs (Cat S/N) — again, a specialist provenance check covers this.
• Service history — ask for stamped service records or digital service history separately.

Treat the free MOT check as your first filter: it weeds out the obvious bad buys before you spend money on a deeper provenance check or waste a Saturday viewing a clocked car.

The bottom line

Five minutes and zero cost can save you from a clocked, neglected or unsafe car. Always check the MOT history before you view, take the printout (or your phone) with you, and ask the seller about anything that doesn’t add up. If they get cagey, that’s your answer.

You can check any UK car’s full MOT history, mileage record and tax status free on MOTMate — no signup, instant results.