How do you spot a clocked car?
By checking the recorded mileage history against the odometer and against the vehicle's physical condition — and mileage adjustment is easier than it has ever been, because digital odometers are altered with a widely available tool in minutes.
Why it happens. Value falls steeply with mileage, so reducing a reading by a substantial amount can add thousands to a sale price. It is not itself a criminal offence to adjust an odometer, but selling a vehicle without disclosing it is fraud — which is why the practice persists in a grey area.
It also happens legitimately, where an instrument cluster is replaced — and that should be documented and disclosed.
The single most effective check: the MOT history. Freely available online by registration, it records the mileage at every test. A reading that decreases, or that shows an implausible jump, is immediately visible. This one check defeats most clocking, and it takes a minute.
What else to check:
Service history — stamps, invoices and digital records all carry mileages.
A paid history check, which aggregates mileage records from insurers, finance companies and other sources, and catches discrepancies between tests.
Physical wear against the claimed mileage. This is where judgement matters:
The steering wheel, gear knob and pedal rubbers — these wear in a way that is difficult to disguise and expensive to replace convincingly. A worn wheel on a low-mileage car is a strong signal.
The driver's seat bolster, which collapses with use.
Wear on frequently touched controls and the door handle.
Tyres — a low-mileage car on its fourth set of tyres has done more than claimed.
Stone chipping and windscreen pitting, which accumulate with motorway miles.
Cambelt and service items replaced at intervals inconsistent with the reading.
What to do:
Check MOT history before viewing, since it costs nothing and eliminates most vehicles remotely.
Ask directly and get the answer in writing, which converts a lie into a documented misrepresentation.
Buy from someone traceable, since redress against a private seller who has moved on is close to worthless.
If you discover it after buying, you may have claims against the seller and — where bought on finance — against the finance provider.