"Clocking" is the practice of winding back a car's odometer to make it appear to have covered fewer miles than it really has. A lower reading inflates the price and hides wear, so it costs unsuspecting buyers hundreds or even thousands of pounds. Here is how to recognise a clocked car and confirm your suspicions before you hand over any money.

Quick answer: Compare the seller's odometer reading against the car's recorded MOT mileage history on gov.uk. If the miles ever drop between tests, jump unusually, or don't match the reading in front of you, the car may have been clocked. A full history check confirms it against additional data sources.

What clocking is — and why it's illegal

Modern digital odometers can be altered in minutes with cheap tools sold online, so clocking is no longer limited to older mechanical dials. Adjusting a reading is not itself an offence, but selling a car without disclosing that the mileage is incorrect is. Under the Consumer Protection from Unfair Trading Regulations 2008, knowingly misrepresenting mileage is fraud, and a seller who does it can face prosecution. The problem is that the alteration leaves no visible trace — the dashboard simply shows a lower number.

How common is it?

Mileage fraud has risen sharply alongside the growth of car finance, because some owners wind back the clock to stay within contract mileage limits and avoid excess-mileage penalties. Industry estimates suggest that a meaningful share of used cars on the market carry an incorrect reading. With the average motorist covering roughly 7,000 to 9,000 miles a year, even a modest wind-back of 30,000 miles can add hundreds of pounds to a car's apparent value.

Warning signs of a clocked car

No single clue is proof on its own, but several together should make you cautious:

  • Mileage vs MOT history mismatch. The single strongest signal. If a recorded MOT reading is higher than a later one, the odometer has gone backwards — which is physically impossible without tampering.
  • Wear that doesn't match the miles. A worn steering wheel, shiny gear knob, sagging driver's seat or heavily worn pedal rubbers on a car claiming very low mileage is a classic giveaway.
  • Gaps in the service book. Missing stamps, or service intervals that don't line up with the mileage shown, can indicate records have been removed or the reading altered.
  • Unusually low miles for the age. A ten-year-old car showing 25,000 miles is possible but rare — treat it as a prompt to check, not a bargain to grab.
  • Fresh or replacement dashboard. A newer-looking instrument cluster, or screws and trim that show signs of removal, can point to tampering.

How to check for mileage fraud, step by step

  1. Check the MOT history on gov.uk. Enter the registration on the government's free MOT history service. Every test records the odometer reading, so you can build a timeline of the car's mileage over the years and spot any reading that falls or leaps unexpectedly.
  2. Compare against the car in front of you. The current odometer reading should be higher than the most recent MOT figure, and consistent with the miles covered since that test.
  3. Run a full history and mileage-anomaly check. The MOT record only covers tests, so it can miss wind-backs between them. A mileage check cross-references readings from finance companies, previous sales and the national mileage register to flag anomalies the MOT data alone won't show. GuruCarCheck includes a mileage-anomaly check in its full report from £7.99.
  4. Inspect the physical condition. Match the wear on the pedals, wheel, seats and gearstick to the claimed mileage, and ask to see a complete service history with invoices.

What to do if you suspect a car has been clocked

If the readings don't add up, do not proceed with the purchase. Raise the discrepancy with the seller and ask them to explain it in writing — a genuine dealer will have documentation. If you have already bought the car and later discover it was clocked, you may have grounds to reject it and claim a refund, and you can report the seller to your local Trading Standards office via the Citizens Advice consumer service. Keep all adverts, receipts and correspondence as evidence.

The bottom line

Clocking is easy to do and impossible to see, but it is not impossible to catch. The MOT history gives you a free timeline of readings, and a full vehicle check confirms the picture against data the MOT record can't see. Spending a few pounds and ten minutes before you buy is the surest way to avoid paying over the odds for a car that has covered far more miles than the dashboard admits.