MOT mileage has gone down: what to check next
By Plateworthy · Updated · Editorial policy
A mileage decrease is a question to investigate. Start with the original dates and units, then request evidence for the inconsistent part of the timeline. Neither a reassuring seller nor a dramatic chart is proof of the explanation.
Check the original entries
Compare at least two usable readings, preserving the date and unit of each. Look for a single extra digit, mixed units or a sequence that changes after an instrument replacement. Do not rewrite the readings yourself to make the chart look tidy.
For example, an isolated 180,000-mile entry between dated records around 80,000 may be a recording error. It still needs support from documents around the date; the shape of the graph does not correct the source.
Request evidence close to the disputed date
Ask for the MOT invoice, service receipt, instrument replacement invoice or workshop record supporting the explanation. Check that each identifies this car and that its date is relevant to the disputed observation.
The official correction process depends on when the test took place and requires evidence for an older incorrect reading. Use the current process linked below rather than assuming the report provider can change an MOT entry.
Decide what remains unconfirmed
If units and documents explain the fall, retain them with your buying record. If they do not, ask for a written mileage description and discuss the uncertainty with the inspector or adviser helping you buy.
A history report flags the discrepancy; it cannot inspect an odometer or establish the car’s true lifetime distance. Unexplained mileage affects how confidently you can compare price, maintenance and use with another car.
Common questions
- Can Plateworthy correct the original MOT mileage?
- No. The original record must be corrected through the official process. Keep the supporting evidence and recheck the published record after a correction is confirmed.
Sources and further checks
Primary guidance checked for this update. Rules and individual circumstances can change; use the linked official service or advice where a decision depends on it.