How to check if a car has been clocked (mileage tampering)

"Clocking" — winding back or tampering with a car's mileage — sounds like a problem from the era of mechanical odometers. It isn't. Digital odometers can be reprogrammed too, and doing so knowingly and selling the car without disclosing it is illegal in the UK under consumer protection law. It still happens because higher mileage lowers a car's value and can hide the true wear on things like the engine, gearbox and suspension.

Why someone would clock a car

Mileage is one of the biggest factors buyers use to judge a car's condition and remaining life. Rolling it back — even by a modest amount — can meaningfully increase what a seller can ask for, and can disguise a car that's had genuinely heavy use, like an ex-taxi or high-mileage motorway car, as something gentler.

Signs worth checking yourself

• Wear versus mileage. Does the pedal rubber, steering wheel, seat bolsters and general interior wear match the number on the clock? A "40,000 mile" car with a heavily worn driver's seat and shiny pedals is worth questioning.
• Service book and receipts. Look for the mileage recorded at each service or MOT — it should climb steadily. Gaps, or a mileage that's lower than a previous entry, are a clear warning sign.
• Tyres and general condition. Original tyres on a car claiming very low mileage, or a worn cambelt/service sticker suggesting more miles than shown, are worth asking about directly.

What a proper mileage check adds

Beyond a visual inspection, a mileage history check compares the figure on the clock against mileage readings recorded at official test points over the car's life — MOT tests, mainly — and flags it if the numbers ever go backwards or jump in a way that doesn't add up. This is the single most reliable way to catch clocking, since it's based on independently recorded readings rather than anything the current seller tells you.

If something doesn't add up

• Ask the seller directly for an explanation — a genuine clerical error at an MOT test does happen occasionally, and a seller with nothing to hide should be able to explain it.
• Don't proceed on a verbal assurance alone if the mileage history shows a real discrepancy — walk away or get it independently verified first.
• If you've already bought a car and later discover it was clocked, keep every document — it's the basis of a legal claim against the seller.