How to tell if a used car's mileage is genuine

A car's mileage is the single number that moves its price the most, so it is also the number most worth checking yourself. The good news is that you do not have to take anyone's word for it. Every MOT test writes the mileage down, and that trail is public.

What does it mean when a car has been "clocked"?

Clocked means the odometer has been wound back so the car looks like it has covered fewer miles than it really has. Fewer miles usually means a higher asking price, and that is the only reason anyone bothers. Digital dashboards have not stopped it, because a display can be altered with a laptop and a cable. What they have not changed is that the mileage gets written down by somebody else once a year.

Where can I check a car's mileage history for free?

On GOV.UK, in about two minutes, using only the registration number. Anyone can check a vehicle's MOT history free on GOV.UK with its registration number: each test's result, the advisories and failures, and the mileage recorded at that test. That is a dated list of readings taken by a tester rather than by a seller, which is exactly what you want. Do it before you set off to view the car, not after.

In England and Wales a car needs its first MOT by the third anniversary of its registration and then every year. So any car over three years old should have a trail of readings behind it, and the longer the trail, the harder it is to fake convincingly.

What should the MOT mileage record look like?

It should climb, every year, and never go backwards. Read the list from the oldest test to the newest and ask three things:

• Does every reading sit higher than the one before it?
• Are the yearly jumps roughly similar, or is there one suspiciously small year?
• Does the newest MOT reading line up with what the dashboard shows now, allowing for the miles driven since that test?

A reading that dips is the obvious red flag. A reading that stays almost still for a year while every other year shows ten thousand miles is the quieter one. Neither proves anything on its own — a car can genuinely sit on a drive for a year — but both need an explanation that makes sense.

What are the warning signs on the car itself?

Wear that does not match the number on the dashboard. Look at the parts a driver touches thousands of times: the shine on the steering wheel, the rubber on the brake and clutch pedals, the driver's seat bolster, the gear knob, the carpet under the driver's heel. A car showing modest miles with a polished wheel and worn-through pedal rubbers is telling you something the dashboard is not. Check the dashboard itself too — scratches round the instrument binnacle or screws that look disturbed are worth asking about.

What should the paperwork show?

Dated entries that agree with the MOT trail. A service book stamped by garages, old MOT certificates, and repair or tyre invoices all carry dates and often mileages, and they should slot neatly between the MOT readings. When a car changes hands the seller tells the DVLA, and the new keeper receives a new V5C log book in the post, so ask to see the current V5C and check the car's details match it.

Is very low mileage always a good thing?

No. A car that has covered a modest, steady number of miles with a full history is usually a better buy than one with an unusually low total and nothing to back it up. Low miles with short journeys can also be harder on an engine and exhaust than steady longer runs. Judge the mileage alongside the condition and the history, not instead of them.

Is clocking against the law?

Hiding something that matters from a buyer is prohibited. Under the Digital Markets, Competition and Consumers Act 2024 Part 4, unfair commercial practices, including misleading omissions, are prohibited. This page is general information about what to check, not advice about a particular car or sale.

How can I see the mileage trail on a ONECARS car?

It is already on the page. Every ONECARS car page old enough to have been tested shows its MOT history from the DVSA, test by test, with the mileage recorded at each test — so you can read the same trail we can without typing a registration into anything. Every ONECARS car page has the car's photographs, its full spec and its MOT history, and anything that needs doing is done by ONEFIX before the car is handed over.

Every ONECARS car is also checked on 34 points by ONEFIX, our own workshop on the same site at Plas Acton, Wrexham — the list is published at /how-we-check-our-cars. A car with work outstanding from its check is not handed over to its buyer until ONEFIX has put it right; the rule sits in our system rather than in a promise. And once the car is yours, ONEFIX next door services, repairs and MOTs it, so the people who checked it are the people who look after it.

An older car with a long MOT record is the easiest kind to read, because there is more of it to read. The 2012 Vauxhall Astra 1.7 Club Ecoflex at £1,295 is a fair example: more than a decade of tests, each with its own mileage, all on one page.

What if I want time to check before I commit?

A reservation holds an ONECARS car for fourteen days; within those fourteen days it can be cancelled for any reason and the fee is refunded in full, and if you go ahead it comes off the price. That is enough room to read an MOT trail properly and ask questions.

A checklist before you buy

• Pull the MOT history on GOV.UK from the registration.
• Read the mileages oldest to newest; check each one is higher than the last.
• Compare the newest MOT reading with the dashboard today.
• Match the service book, invoices and old certificates to those dates.
• Look at the wheel, pedals, seat and carpet for wear that disagrees.
• Check the V5C details match the car in front of you.
• Ask about anything that does not add up, and expect a straight answer.

Where should I look next?

Our guide to how to check a used car's MOT history walks through reading the record itself, and what to check when you view a used car covers the walk-round. If you would rather ask a person, we are at Plas Acton Garage, 282 Chester Road, Wrexham LL12 8DU, with a second forecourt at Ruyton near Shrewsbury, open Monday to Friday 9 to 5 and Saturday 10 to 4 for viewings by appointment. The office number is 01978 356983, or use /contact. You can browse everything we have at /used-cars.