Mileage Discrepancy · Clocking Detection

MOT Mileage Discrepancy Explained

Every MOT test records the vehicle's odometer. A mileage decrease between any two consecutive tests is one of the clearest indicators of odometer fraud. Here is how to read DVSA records and what to do when something does not add up.

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The short answer

MOT Mileage Discrepancy Explained

An MOT mileage discrepancy is when a vehicle's recorded mileage at one test is lower than at a previous test. Since mileage can only legitimately increase, any decrease — even by a single mile — is a strong indicator of odometer fraud (clocking). DVSA MOT records are the most reliable free tool to detect this. Check the full mileage timeline before buying any used car.

The evidence

How DVSA MOT Records Expose Mileage Fraud

At every MOT test, the examiner records the odometer reading from the vehicle's dashboard. These readings are entered into the DVSA national database and form a permanent, unalterable timeline of the vehicle's mileage history. The person selling the car cannot access or change these records — which makes them the most powerful free fraud-detection tool available to any UK buyer.

A clocked vehicle will often display consistent, believable-looking mileage — but the DVSA records will reveal the original readings taken at each annual test. The fraudster can change the dashboard odometer, but they cannot change history.

How to read records

How To Read MOT Mileage Records

Pull the full test history

Use MotR's free MOT History Checker. Every test since 2005 will be listed in chronological order with its mileage reading.

Read chronologically oldest to newest

Look at the mileage sequence from the earliest test to the most recent. Each entry should be larger than the last.

Calculate annual mileage

Divide the difference between any two readings by the time between tests. UK average is 7,500–10,000 miles per year. Significant variation is worth questioning.

Flag any decrease

Any reduction in mileage between consecutive tests — no matter how small — is a red flag. Do not accept a verbal explanation without documentary evidence.

Check the final reading vs current odometer

Compare the most recent MOT mileage against the odometer you see in the car. If the car claims fewer miles now than at its last test, something is seriously wrong.

Free tool

Check MOT Mileage History Free

Official DVSA data — every mileage reading, every test.

Types

Types of Mileage Discrepancy

Type	Example	Likely cause	Action
Mileage decrease	90,000 at 2022 test → 72,000 at 2023 test	Odometer tampered (clocking)	Walk away unless documented odometer replacement
Mileage reset	High mileage to suspiciously low in single jump	Dashboard swap with lower-reading cluster	Demand documented repair history
Mileage stagnation	Same reading across 3+ consecutive tests	Non-use (acceptable if on SORN) or odometer fault	Investigate with seller
Sudden large jump	10,000 avg per year, then 40,000 in one year	High-use period (new owner, job change)	Investigate but not necessarily fraudulent

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Questions & answers

Frequently Asked Questions

What is an MOT mileage discrepancy?

An MOT mileage discrepancy is when the mileage recorded at one MOT test is lower than the mileage recorded at a previous test. Because MOT testers record the odometer reading at each test, any decrease in mileage between consecutive tests strongly indicates that the odometer has been tampered with — a practice known as clocking.

Is a small mileage discrepancy always clocking?

A decrease in mileage, however small, between any two consecutive MOT tests is a serious red flag. Odometers should only increase. A minor discrepancy could theoretically result from a legitimate odometer replacement (with documentation), but absent a verifiable explanation, any drop should be treated as potential fraud.

What if there is a very large mileage jump between tests?

A large increase is less suspicious than a decrease, but very large jumps can indicate the car was being used heavily or that previous mileage had been suppressed. Look at the surrounding tests — is the jump consistent with the apparent age and use of the car? Cross-reference with service history if available.

Can mileage be legitimately lower at one point?

In theory, a legitimate odometer replacement following a dashboard failure could cause a lower displayed reading. However, this should be documented — the garage replacing the instrument cluster should note the replacement and the previous known mileage. Any seller claiming this as an explanation should be able to provide the repair documentation.

Does DVSA investigate mileage discrepancies?

DVSA investigates complaints about MOT fraud, including mileage manipulation. If you suspect a vehicle's mileage has been tampered with, you can report it to DVSA via the GOV.UK reporting mechanism. The seller may also be committing an offence under the Consumer Protection from Unfair Trading Regulations 2008 if they knowingly sold a vehicle with a false mileage claim.

What should I do if I spot a mileage discrepancy when buying a car?

Walk away unless the seller can provide a compelling, documentable explanation supported by evidence. The risk of buying a clocked vehicle includes accelerated wear you are unaware of, higher future maintenance costs, incorrect service intervals, and reduced resale value. No explanation is as reliable as consistent mileage records.

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MOT mileage readings are recorded by DVSA at every test since 2005. MotR is not affiliated with DVLA, DVSA or GOV.UK. Report suspected fraud via the official GOV.UK mechanism. Last reviewed 13 June 2026.

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