What clocking is
Clocking is winding back a vehicle's odometer to make it appear to have covered fewer miles than it really has. A lower reading means a higher price (often thousands of pounds on a family car) and hides how worn the engine, gearbox, clutch and suspension really are. Ironically, digital odometers made the fraud easier: cheap “mileage correction” tools can rewrite a modern cluster in minutes, and they are legal to own. What is illegal is selling a vehicle with a false mileage without declaring it.
The MOT record is your best defence
At every MOT test, the tester records the odometer reading, and the DVSA keeps every reading permanently. A seller can rewind the dashboard, but they cannot rewrite the government's test history. That makes the free MOT mileage trail the fastest clocking check available:
- Run a free mileage check and read the mileage column from oldest test to newest.
- Readings should only ever climb. Any drop between tests means the odometer was altered or a cluster was swapped.
- Compare the newest MOT reading with the dashboard. If the car shows fewer miles today than at a past MOT, walk away.
- Watch the rate, not just the direction. A car that covered 12,000 miles a year for five years and then suddenly 500 a year, right before sale, deserves hard questions.
Other signs of a clocked car
- Wear that doesn't match the miles: a shiny, smooth steering wheel, sagging driver's seat bolster, or brake pedal rubber worn through on a “40,000-mile” car.
- Service history gaps, missing stamps, or invoices showing higher mileages than the odometer.
- Windscreen service reminders or garage stickers with mileages above the current reading.
- A price meaningfully below similar cars: clocked cars are often priced to sell fast.
What to do if you spot it
If the history shows a discrepancy, don't buy. There is no safe way to price a car whose true mileage is unknown. If you already bought a car that turns out to be clocked, you have rights: report the seller to Trading Standards via Citizens Advice, and pursue the dealer under the Consumer Rights Act 2015 if you bought from a trade seller. Clocking a car for sale is a criminal offence of fraud.
Mileage is only one part of a used car's story. Before viewing anything, work through the full buying checklist and read how to read an MOT history.