A car arrives at Copart UK with 38,000 miles on the dashboard. The 2024 MOT recorded 67,000. The 2023 MOT recorded 64,000. Either the dashboard cluster has been tampered with, or it has been replaced with one from another car, or the seller is hoping nobody bothers to check.
This pattern shows up regularly on UK salvage lots. The DVSA MOT History API records mileage at every test, and that record is free, public, and queryable by VRN. Five minutes of cross-checking can save you from paying a 38,000-mile premium for a 67,000-mile car.
Why salvage cars are particularly prone to it
The path to a salvage auction is short on accountability. The car was written off by an insurer, may have changed hands once or twice in the recovery process, and then arrives at Copart for sale. There is no requirement at any stage that the dashboard reading match the historical record.
Sometimes the discrepancy is innocent: a replacement instrument cluster from a breaker, fitted during a previous repair, with a lower mileage than the donor car. Sometimes it's deliberate. From a buyer's perspective the cause doesn't matter — the car is worth its actual mileage, not the displayed one.
The DVSA MOT history record
DVSA records every MOT test going back to 2005. For each test, the public record holds:
- Date
- Result (pass / fail / advisory)
- Mileage at test
- Failure items, if any
- Advisories
You can query it free at gov.uk/check-mot-history by VRN. The same data underpins every commercial vehicle history check, and it's the basis of CarMargin's mileage-fraud detection.
What "fraud" looks like in the data
There are three patterns to look for. They get more suspicious in order:
1. Headline reading lower than historical
The Copart listing says 38,000 miles. The most recent MOT record is 67,000. This is the textbook clock job. The dashboard is showing fewer miles than the car has actually done.
Possible benign explanation: a replacement instrument cluster was fitted after the most recent MOT. Possible non-benign explanation: someone clocked it before sending it to Copart. Either way, value the car at the higher mileage.
2. Mileage going backwards within MOT records
The 2022 test recorded 80,000. The 2023 test recorded 75,000. Mileage can only go up. If the historical record itself shows a backward jump, somebody tampered with the cluster between those two tests — and DVSA's record captured the moment.
This is the cleanest signal you can get. There is no innocent explanation for the same VRN doing fewer miles in a year than the previous total.
3. Implausible annual rate
The 2020 test recorded 40,000. The 2024 test recorded 45,000. Five thousand miles in four years on a daily-driver-shaped car is well outside normal usage. Possible explanations: the car was off the road for repair, the car was a SORN garage queen, or — most commonly — the dashboard was clocked at some point and a later reading reset closer to truth.
Implausible rates are a softer signal than going-backwards: real cars do sometimes sit for years. But on a salvage lot, "this car has done 5,000 miles in four years" is unusual enough to be worth a question.
A quick manual workflow
- Note the Copart-displayed odometer reading.
- Open gov.uk/check-mot-history and enter the VRN from the listing.
- Read the most recent MOT mileage. Compare to the displayed reading.
- Scroll back through every MOT in the record. Check the trend is monotonic increasing.
- If anything looks off, Copart-low, MOT-going-backwards, or implausible rate, discount your max bid for the higher number.
TMU = "Total Mileage Unknown". NOT-ACTUAL means the odometer reading isn't certified. Both are Copart odometer brands worth knowing.
What CarMargin does automatically
For every UK Copart lot you open with a visible VRN, CarMargin runs the DVSA query and overlays the MOT mileage history with the listed odometer. When any of the three fraud patterns shows up, it's flagged in the analysis with the test date and the discrepancy in miles.
The chat will explain what the data shows when asked: "what does the MOT record say about this car's mileage?" — and the verdict (BUY / MAYBE / SKIP) factors a flagged discrepancy into the resale value calculation.
When you can't check
Some Copart lots arrive without a visible VRN. Some are too new to have an MOT history (under three years old). Some have an EXEMPT odometer brand — meaning the car is old enough that mileage isn't legally tracked, and there's no MOT mileage record because there's no requirement to record one.
In all three cases, treat the displayed mileage as unverified. The TMU and NOT-ACTUAL odometer brands tell you Copart itself can't certify the reading. Adjust your bid accordingly.