How to spot a clocked car from the MOT history

Why clocking still happens

Lower mileage means a higher price, a longer perceived life and, for a car coming off a lease or PCP, no excess-mileage charge. Mileage adjustment services are not themselves illegal — an odometer can legitimately be corrected after a cluster replacement — but selling a car on a false mileage is fraud. That gap is where the trade in clocked cars lives.

Read the timeline, not the number

A single odometer reading tells you nothing. What matters is the shape of the whole history. Plot every MOT reading in date order and look at how the line behaves.

• A reading lower than an earlier one. The clearest signal there is. Odometers do not go backwards; sometimes it is a keying error at the test station, often it is not.
• A flat stretch. Two or three years with almost no mileage added, then normal use resuming, usually means the readings on either side do not belong to the same story.
• An abrupt change of pace. 18,000 miles a year for five years, then 4,000 a year in the two years before sale, is the classic pre-sale wind-back pattern.
• A gap in testing. Missing years remove the evidence. Ask what the car was doing and look for service records covering the gap.
• Mileage that contradicts the car. 40,000 miles with a polished steering wheel, shiny pedal rubbers, a sagging driver's seat bolster and three sets of tyres does not add up.

Corroborate with everything else that records a number

• Service book stamps and, better, the invoices behind them — garages record mileage on every job.
• Tyre and brake invoices, cambelt work, and the sticker in the door shut or under the bonnet from the last belt or service.
• The stored mileage in the car's own modules. Many vehicles hold service-interval or module mileage that a basic dash reset misses, and a diagnostic scan can surface it.
• MOT advisories about worn tyres or corrosion at a mileage that supposedly is barely run in.
• The number of previous keepers, and the dates of keeper changes, against the pattern of use.

What to do when the numbers do not line up

Ask the seller directly and listen to the explanation. A replaced instrument cluster is a real thing and usually comes with an invoice and a documented reading. An adjustment carried out and properly disclosed will have paperwork too. Vagueness, irritation or a story that changes is your cue to leave.

If you have already bought a car and then find the mileage was misrepresented, keep the advert, the receipt and the history, and take it up with the seller — a trader selling to a consumer is on the wrong side of both consumer protection and misleading-price rules. Report the seller to Trading Standards; patterns of clocking are usually commercial rather than one-off.

The cheap version of this check

Our free check shows the full DVSA MOT history with the recorded mileage at every test, so you can read the timeline before you spend anything or drive anywhere. The full report adds the mileage-anomaly record held by the finance industry, which draws on readings from sources beyond the MOT — including finance settlements, auctions and service networks.