How to check if a car has been clocked using MOT mileage history

"Clocking" means winding back a car's odometer so it shows fewer miles than it has really done. It makes a car look less worn and adds hundreds or even thousands of pounds to its price. With modern digital dashboards it can be done in minutes with a laptop, leaving no visible trace.

Every MOT in Great Britain records the odometer reading, and those readings are public. Used properly, they're the most powerful free tool you have for spotting a clocked car. For scale, the average car at its 2023 MOT had covered 73,145 miles.

Why MOT mileage records are so useful

Each year, a different tester types the current mileage into the DVSA system. A clocker can change what the dashboard shows today, but they can't go back and change readings that are already on the national record. If a car showed 78,000 miles at its MOT two years ago and 52,000 miles now, something's wrong.

Records go back to 2005, so most cars have years of readings to compare.

Step by step: checking a car's mileage history

1. Get the registration from the advert or the seller.
2. Run a free mileage check. Our car mileage check lists every reading, puts them on a chart and flags any that go down.
3. Look at the overall shape. Mileage should rise steadily, test after test.
4. Look for any reading lower than the one before. This is the key warning sign.
5. Compare the latest reading with the advert. Add a sensible amount for the time since the last MOT.
6. Compare with the service history. Invoices and stamps usually record mileage too.
7. Compare with the dashboard when you view the car.
8. Ask about anything that doesn't fit, and get the answer in writing.

Worked examples

A normal history

The car covers between 7,000 and 9,000 miles a year, quite close to the UK average of roughly 7,000. Nothing to worry about.

A clear warning sign

Between 2023 and 2024 the reading drops by more than 22,000 miles, and afterwards the car apparently covers far fewer miles than before. That's the classic pattern of clocking. Unless the seller has documented proof of an instrument cluster replacement, walk away.

A probable typing error

The 2023 reading is missing a digit (68,400 was probably intended), and the next reading returns to the expected trend. This is likely a tester's mistake. It's still worth asking, but it isn't the pattern of clocking.

Other warning signs

MOT readings are the strongest evidence, but look for these too:

• A sudden change in yearly mileage. A car that did 15,000 miles a year and then only 3,000 a year might have been parked up, or might have been clocked.
• Wear that doesn't match the mileage. A shiny steering wheel, worn gear knob, sagging driver's seat bolster or worn pedal rubbers on a "low-mileage" car don't add up.
• Gaps in the service history around the time of a suspicious reading.
• Service invoices that disagree with the MOT readings.
• A new or replaced instrument cluster with no paperwork.
• A price that's too good to be true for the advertised mileage.

Innocent explanations

Not every drop means fraud. Common honest reasons include:

A legitimate seller should be able to explain a drop and show you documents. A vague answer ("it's always been like that") isn't good enough.

Digital dashboards and electric cars

Older cars had mechanical odometers, and tampering often left scratches or misaligned numbers. Modern cars store mileage electronically, sometimes in several control units. That doesn't stop clocking, but it does mean a main dealer or specialist can sometimes read the mileage stored in other modules and compare it with the dashboard. If you're spending serious money, it's worth asking.

What to do if you suspect clocking

Before you buy

Don't buy until you're satisfied. Ask for a written explanation and supporting documents. Consider a paid history check, as some providers combine extra mileage sources such as dealer and service records. If in doubt, walk away. There are plenty of other cars, and you can compare two cars' mileage records side by side to find a better one.

After you've bought

If you've already bought a car that turns out to have false mileage:

1. Gather evidence: the advert, receipts, the MOT history and any messages with the seller.
2. If you bought from a trader, you have strong rights under consumer law. Contact the seller in writing first.
3. Contact Citizens Advice, which can refer the case to Trading Standards.
4. If you paid by credit card or finance, the lender may share responsibility.
5. If you bought privately, your rights are more limited, but you may still have a claim if the seller misdescribed the car.

Imported and older cars

Mileage checks are harder on some vehicles, so take extra care with:

• Imports. Miles covered abroad before the car arrived in Great Britain won't appear in the MOT history. The first British MOT can show a low reading that isn't the full story. Ask for foreign service records and registration documents.
• Cars under three years old. They haven't had an MOT yet, so there are no independent readings. Rely on service records, which for a new car should be from the dealer network.
• Cars that were off the road. A long gap with no MOT means no readings for that period. Ask where the car was and why.
• Cars with a replaced engine or gearbox. These don't change the odometer, but they can explain wear that seems out of line with the mileage.

Selling? Get ahead of questions

If your own car has an odd reading in its history, perhaps from a typo years ago, check it before you advertise. Mention it in the advert with an explanation, and keep any proof. Buyers who find an unexplained drop will usually walk away, so dealing with it up front protects your sale.

Summary

Run the registration through a mileage check before you view any used car. Look for steady growth and any reading that goes backwards. Compare the latest figure with the advert, the dashboard and the service history. Treat any unexplained drop as a reason to walk away. Ten minutes of checking can save you from paying thousands for miles the car has already done.

For a wider look at a car's record, read our guide to reading MOT history before buying, and confirm the vehicle details match the paperwork with a reg check.