Mileage went down between MOT tests

When MOT History shows a lower mileage on a later test — what Car Buyer Check flags, what it does not prove, and questions for the seller.

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Illustrative car for inspection areas

Sometimes a later MOT lists fewer miles or kilometres than an earlier test in the same units. That is visible in the official history. Buyers often assume clocking immediately. Car Buyer Check records the decrease as a factual finding and treats it as something to ask about — not as proof of tampering.

What the engine flags

When consecutive readings use the same unit and the later value is lower, a mileage-decrease finding is raised with both dates and the recorded numbers. The interpretation in the report states plainly that a decrease is not, by itself, evidence the odometer was wound back. Clerical errors, dashboard replacement, or data entry mistakes can also appear in national records.

If units differ between tests, the engine does not treat the pair as a decrease sequence; mixed units are handled separately. See the mileage-on-MOT-history guide for tracing a normal rising record and spotting missing readings.

Preview and buyer report

Run the registration at the top of this page. The free preview may include the decrease within the marked look-outs and buyer position summary when the pattern is present. It will not accuse the seller on your behalf.

  • The buyer report shows the mileage-decrease observation with the exact readings quoted from MOT History.
  • Seller questions suggest asking for an explanation and supporting paperwork — not asserting fraud.
  • The timeline places the drop next to neighbouring tests so you can see what else changed on those dates.

Sensible next steps for buyers

At the viewing, compare the dashboard to the latest MOT reading and the advert. Request service invoices or MOT printouts that bracket the dates in question. If the explanation is weak, you can walk away — without Car Buyer Check making a legal claim we cannot support.

We do not run forensic mileage investigations or stolen/finance checks. This feature only surfaces what DVSA already published and phrases the buyer action as a question, matching the engine’s buyer-action text on the finding.

Official sources

Does a mileage drop mean the car was clocked?

No. It means the recorded readings went down between two tests in the same units. The reason is unknown from MOT data alone. Ask the seller and review documents — we do not label it clocking.

Can a dashboard change explain a drop on MOT History?

Instrument replacement or reset can affect what appears on a test day. That is one reason the report avoids treating a decrease as proof of crime.

Will every registration show a mileage-decrease finding?

Only when the published readings meet the rule. Many cars show a steady rise or have gaps instead.

How is this different from the general mileage guide?

The mileage-on-MOT-history page explains the full trace, gaps, and mixed units. This page is only for a lower later reading in matching units.

What should I say to the seller?

Use the copyable seller question in the buyer report, which asks for an explanation of the mileage history. Keep the conversation factual rather than accusatory.

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