Check a car's mileage on the GOV.UK MOT history service. Read the odometer readings test by test: if any reading drops, or a year shows an implausibly small jump, the mileage may have been clocked.
Last reviewed: June 2026
How the MOT History Records Mileage
A car mileage check using free MOT history data is the quickest way to spot a clocked odometer. Whenever a vehicle is presented for its annual MOT, the tester enters the odometer reading into the DVSA system as part of the test record. That single number, captured once a year, is what turns the MOT history into a usable mileage timeline. Because the reading is logged at the moment of testing and cannot easily be altered afterwards, the sequence of MOT readings forms an independent trail that sits outside the seller's control.
- DVSA records the odometer reading at every MOT test, and the GOV.UK check MOT history service displays that sequence free of charge.
- A recorded mileage that falls between one test and a later test is physically impossible on a working odometer and is the clearest sign of tampering.
- The first MOT is due on the third anniversary of registration for most vehicles, so a car may have no recorded MOT mileage in its first three years.
- Adjusting an odometer is not itself a criminal offence, but selling a vehicle without disclosing that the mileage is incorrect can breach the Consumer Protection from Unfair Trading Regulations 2008.
- MOT history is published by DVSA and covers tests in England, Scotland and Wales; readings can be cross-checked against service invoices and the V5C.
The readings are published through the GOV.UK check MOT history service. Entering a registration number returns each test date, the result, any advisory or failure items, and the odometer reading recorded on that date. Stepping through the list from the earliest test to the most recent produces a year-by-year picture of how far the car has travelled. On a genuine vehicle, the numbers rise steadily, and the annual increase usually sits somewhere in a believable range for the way the car has been used.
Reading the Sequence to Spot Clocking
The single most important rule is simple: an odometer reading should never go down. A working odometer only counts upward, so if the MOT history shows a later test with a lower reading than an earlier one, the mileage has almost certainly been wound back. This is the clearest evidence of clocking that the public record can give, and it requires no special knowledge to spot.
The second warning sign is an implausible jump. A car that adds 12,000 miles a year for several years and then suddenly records only 1,000 miles in a single twelve-month gap deserves scrutiny, especially if the low-mileage year coincides with a change of keeper or a sale. Equally, an enormous jump followed by suspiciously low figures can suggest the reading was corrected or that the displayed mileage no longer reflects the true distance travelled. The point is not that any single irregular gap proves clocking, but that the pattern should make sense for a car that has genuinely covered the stated distance.
| Warning sign in the history | What it can indicate |
|---|---|
| A later reading lower than an earlier one | Odometer wound back: strongest evidence of clocking |
| A year with an unusually small mileage jump | Possible rollback masked across a sale or keeper change |
| A sudden large jump then very low figures | Replaced or corrected cluster, or inconsistent recording |
| Reading flat across two tests | Possible off-road period, or a stalled or tampered odometer |
| Dashboard mileage lower than last MOT reading | Mileage altered since the most recent test |
What Clocking Is and Why It Happens
Clocking is the practice of altering a vehicle's recorded mileage to make it appear that the car has travelled fewer miles than it actually has. On older vehicles this meant physically winding back a mechanical odometer; on modern cars it is done electronically, with equipment that rewrites the figure stored in the instrument cluster. The result is the same: a buyer is shown a number that understates the genuine wear on the engine, transmission and other costly components.
The motive is money. Lower mileage raises a car's apparent value, so a clocked vehicle can be sold for more than its true condition justifies. A car shown with a falsely low reading may also hide the fact that major service intervals are overdue. Mileage adjustment can be carried out for legitimate reasons too, such as fitting a replacement instrument cluster, but in those cases the change should be documented and disclosed. The danger arises when a wound-back figure is presented to a buyer as if it were genuine.
Mileage Adjustment Law and What Is Legal
Adjusting an odometer is not in itself a criminal act in the United Kingdom, and companies that offer mileage correction services operate openly. What the law targets is deception. Under the Consumer Protection from Unfair Trading Regulations 2008, a trader who sells a vehicle while representing a false mileage as genuine, or who fails to disclose that the recorded mileage is incorrect, can commit an offence. Misrepresenting mileage can also amount to fraud and can give a buyer civil remedies against a seller.
In practical terms, this means a legitimate mileage adjustment must be recorded and made clear to any future buyer. A reputable seller will explain a cluster replacement and provide paperwork showing the true distance covered. Where no such explanation exists and the MOT history shows a reading that has gone backwards, the prudent assumption is that something is wrong. The legal framework protects buyers, but only those who check the record before they commit.
What to Do If a Reading Looks Wrong
If the MOT history shows an impossible or suspicious reading, the first step is to compare it against every other source available. Look at the seller's service invoices, the stamps in any service book, the readings noted on old MOT certificates, and the figure currently showing on the dashboard. A genuine car's paperwork will agree with the MOT timeline; a clocked car will show contradictions between these sources.
Raise any discrepancy with the seller before money changes hands and ask for a documented explanation. If the explanation is unconvincing or absent, walking away costs nothing. Where a vehicle has already been bought and the mileage later proves false, a buyer can report the matter to a local Trading Standards service via the consumer advice route on GOV.UK and seek independent legal advice about their rights. Checking the MOT mileage trail before purchase remains the simplest protection.
It also helps to weigh whether the recorded mileage matches the physical condition of the car. A vehicle showing very low miles but with a heavily worn driver's seat, shiny pedal rubbers, a polished steering wheel and tired carpets is sending a contradictory message. Wear like this builds up with use, so a cabin that looks far older than the odometer suggests is another prompt to scrutinise the MOT timeline closely. Genuine low-mileage cars usually look the part inside as well as on the dashboard, and a mismatch between the two is worth treating as a warning sign rather than a coincidence.
Frequently Asked Questions
How do I check a car's mileage history?
Use the GOV.UK check MOT history service and enter the registration number. The results list each MOT test with the odometer reading recorded on that date. Reading those figures in order gives a year-by-year mileage timeline that you can compare against the dashboard and the service records.
Can MOT history show if a car has been clocked?
It often can. Because DVSA logs the odometer reading at every test, a reading that drops between an earlier and a later test points strongly to clocking. An implausibly small annual jump, especially around a sale, is a further warning sign worth investigating before you buy.
What is car clocking?
Clocking is altering a vehicle's recorded mileage to make it look as though the car has covered fewer miles than it really has. It can be done by winding back a mechanical odometer or by electronically rewriting the figure stored in a modern instrument cluster. The aim is usually to inflate the car's apparent value.
What should I do if a car's mileage looks wrong?
Compare the MOT history against the service invoices, old certificates and the current dashboard reading, and ask the seller for a documented explanation. If the figures contradict each other and no clear reason is offered, it is sensible to walk away. After a purchase, you can report a false mileage to Trading Standards through GOV.UK.
Is clocking a car illegal?
Adjusting an odometer is not itself a criminal offence in the United Kingdom. However, selling a vehicle while presenting a false mileage as genuine, or failing to disclose that the mileage is incorrect, can breach the Consumer Protection from Unfair Trading Regulations 2008 and may amount to fraud.
