Guide
How to Spot a Clocked Car From the MOT History
Updated July 2026
The seller says “genuine low mileage, one careful owner.” The dashboard reads 48,000 miles. But is that number real? Clocking — winding back an odometer to make a car look less used — is one of the oldest tricks in the used-car trade, and it still catches thousands of UK buyers every year. The good news: the MOT history usually gives it away in under a minute.
Why this matters
Roughly 1 in 16 used cars in the UK has a mileage discrepancy, according to industry checks. A clocked car isn’t just worth less than you paid — higher real mileage means more wear on the engine, gearbox and clutch, and a much higher chance of expensive repairs soon after you buy.
The reason clocking is so easy to catch is simple: every MOT test records the car’s mileage on the day. From a car’s third birthday it’s tested every year, so the MOT history builds a year-by-year trail of odometer readings the seller can’t edit.
How to read the mileage trail
Line up the mileage from each MOT test in date order and look for two things:
- Mileage should only ever go up. A reading that drops and STAYS below the earlier trend on every later test points to a wound-back odometer. But a single dip that later readings rejoin is usually a keying error at the test centre — far more common than fraud, and worth verifying against the service history rather than panicking over.
- The yearly jump should be believable. The UK average is around 7,000–8,000 miles a year. A car doing 12,000 miles a year for five years that suddenly does 1,500 right before sale deserves a hard second look.
You don’t need to trust the seller’s word or the dashboard. The MOT history is the receipt they can’t rewrite.
What clocking looks like in practice
Imagine a car with this MOT mileage trail:
- 2020 — 31,200 miles
- 2021 — 44,800 miles
- 2022 — 58,100 miles
- 2023 — 39,500 miles
The 2023 reading is lower than 2022 — now the next test decides what it means. If later readings continue from the LOWER figure (2024 — 41,300), the whole trail has stepped down: a strong sign the odometer was wound back. If instead the next test jumps back above the old trend (2024 — 71,900), the 2023 reading was almost certainly mistyped at the test centre — a recording error, not clocking. Either way you have a question for the seller, and this is exactly the pattern our AI separates automatically.
⚑ Red flags checklist
- An MOT reading that drops and stays below the earlier trend on later tests
- A sudden collapse in annual mileage just before the car is sold
- Dashboard mileage that doesn’t match the latest MOT reading
- A gap in the MOT history where a reading is missing
- Very low recorded mileage on a car with heavy interior, seat or pedal wear
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