Clocking - rolling back a car's odometer to show a lower mileage than the vehicle has actually covered - is one of the most common forms of used car fraud in the UK. Industry research consistently puts the number of clocked vehicles on UK roads in the hundreds of thousands, and at any given moment there's a real chance one of the cars on your shortlist has a manipulated odometer.
The good news: there's a free government tool that catches most cases in under two minutes. Here's exactly how to use it.
Why Mileage Fraud Is So Profitable
A used car's mileage is one of the single biggest drivers of its value. The difference between 40,000 miles and 80,000 miles on a typical five-year-old family car can be £2,000-5,000. Wind the clock back 40,000 miles and you've just created that difference out of thin air.
Modern digital odometers are harder to clock than old mechanical ones, but it's still possible with specialist equipment that's readily available. The only reliable paper trail that catches it is the official MOT history.
The Free Check: DVSA MOT History
Every vehicle that has had an MOT in the UK has its mileage recorded at the time of the test. This data is held by the DVSA and is publicly available for free at gov.uk/check-mot-history.
To check a vehicle:
- Go to gov.uk/check-mot-history
- Enter the vehicle registration
- The full MOT history is displayed - every test, the result, any advisories, and the recorded mileage at each test
It takes 90 seconds. Do it for every car you're seriously considering, without exception.
How to Read the MOT History for Clocking
The history is displayed in reverse chronological order - newest test at the top. You're looking for the mileage progression across tests.
In a legitimate vehicle, mileage should increase with every successive test. The only exception is a very lightly used car where the increase between two close-together tests is genuinely tiny.
Example: Obvious Clocking
| Test date | Result | Mileage recorded |
|---|---|---|
| September 2024 | PASS | 62,400 |
| September 2023 | PASS | 84,100 |
| September 2022 | PASS | 71,300 |
In this example: the car went from 71,300 miles in 2022 to 84,100 in 2023 (normal). Then it somehow lost 21,700 miles between 2023 and 2024. That's a clocked car. Walk away.
Example: Subtle Clocking
| Test date | Result | Mileage recorded |
|---|---|---|
| March 2025 | PASS | 48,200 |
| March 2024 | PASS | 46,100 |
| March 2023 | PASS | 44,800 |
| March 2022 | PASS | 43,500 |
This looks fine at first glance - mileage is going up. But the car is allegedly covering only 1,300-2,100 miles per year over three years. For a typical private car, that's suspicious. Cross-check against the seller's story. If they claim it was a daily driver, something doesn't add up.
Other Clocking Red Flags
The MOT history catches most cases, but some clocked cars have had their MOT history partially obscured too (re-registered, history gaps). Combine the digital check with physical inspection:
Wear and tear vs claimed mileage
- Steering wheel - A 30,000-mile car should have very little wear on the leather or grip surface. Heavy wear suggests much higher mileage.
- Driver's seat bolster - The outer edge of the driver's seat wears distinctively. A well-worn bolster on a "low mileage" car is a red flag.
- Pedal rubbers - Accelerator and brake pedal rubbers show genuine wear patterns. New pedal rubbers on an older car might mean the seller has replaced them.
- Gear lever surround - Heavy wear on the gear knob or surround suggests high usage.
Service history gaps
A genuine low-mileage car tends to have proportionally fewer services, with stamps spread over more years. A clocked car often has a service history that doesn't quite match the claimed mileage. Look for stamps from two different time periods that don't add up.
Suspicious mileage for the age
The UK average is around 7,000-8,000 miles per year for private cars (lower than many people expect). A 10-year-old car with 28,000 miles is worth questioning - it's not impossible, but understand why the mileage is that low before you pay a premium for it.
High-Risk Vehicle Types
Clocking isn't evenly distributed. Certain categories of vehicle carry a disproportionate risk:
- Ex-taxis and private hire vehicles - These cover enormous mileage in service. Clocking brings the odometer back to something more palatable for retail sale.
- Ex-fleet vehicles - High-mileage fleet cars are often clocked before being sold through less reputable dealers.
- Commercial vehicles - Vans and pickups that have done heavy work mileage.
- Prestige German cars - BMW, Mercedes, and Audi see disproportionate clocking because their resale values are so sensitive to mileage.
- Online private sales - Private sellers have less accountability than dealers, and some deliberately obfuscate or omit service history.
What to Do If You Suspect Clocking
If the MOT history shows a mileage drop, don't engage with the seller's explanation. There is no legitimate explanation. The data is recorded by an independent test station - it's not a mistake.
If the history looks plausible but physical inspection raises doubts:
- Ask the seller directly why certain wear patterns don't match the claimed mileage
- Walk away if they can't satisfactorily explain it
- You can report suspected clocking to the DVSA if you believe it was deliberate fraud
How CarMate Checks This Automatically
Every CarMate report pulls the full DVSA MOT history for the vehicle and automatically scans for mileage discrepancies - both between consecutive MOT tests, and between the most recent MOT mileage and the seller's stated mileage. If there's a drop or inconsistency, CarMate flags it at the top of the report so it's the first thing you see.
You don't need to read a table of test dates and manually look for drops. CarMate does it in seconds and tells you exactly what it found.