Understanding Your Car's MOT History
A car's MOT history is one of the most revealing free records available to a UK buyer. Read properly, it tells the story of how a vehicle has been maintained, flags recurring problems, and can even expose mileage fraud. This guide shows you how to read an MOT history like a mechanic would.
What is in an MOT history?
Every MOT test carried out in England, Scotland and Wales since around 2005 is recorded centrally by the DVSA. For each test the record shows the date, the result (pass or fail), the mileage reading at the time, and any defects or advisories noted by the tester. A free carDNA check pulls this complete history instantly from the official DVSA database.
Understanding defect types
Since 2018 MOT defects are graded by severity. Knowing the difference is essential to judging whether a fault is trivial or a deal-breaker.
A direct and immediate risk to road safety or the environment. The car must not be driven until repaired — an automatic fail.
Could affect safety or the environment. An automatic fail — the fault must be repaired and the car re-tested.
No significant effect on safety, but should be repaired soon. The car still passes but the fault is recorded.
Something to monitor — a component beginning to wear that may need attention in future. The car passes.
How to read an MOT history like a mechanic
1. Look for recurring faults
The single most useful thing an MOT history reveals is patterns. If the same advisory — say, a corroded brake pipe or a worn suspension bush — appears year after year, it suggests the owner has been ignoring it or patching it cheaply rather than fixing it properly. Recurring issues with brakes, suspension or corrosion are worth taking seriously.
2. Check the mileage progression
Each MOT records the odometer reading. Plotted across years the mileage should climb steadily. If it ever drops — or barely moves for a year and then jumps — that's a red flag for clocking (illegally winding back the odometer). Genuine low-mileage cars show consistent, believable annual increases.
Mileage going backwards is a serious warning sign. An odometer reading lower than a previous test strongly suggests the mileage has been tampered with. Treat any such car with extreme caution.
3. Note the failure history
A car that fails its MOT every single year, often on the same components, has typically not been well looked after. The occasional fail is normal — cars are complex — but a long string of failures suggests deferred maintenance.
4. Watch for gaps
A missing year in the MOT record can mean the car was off the road (SORN), or simply that it was tested late. It's worth asking the seller to explain any gaps, especially recent ones.
What a clean MOT history looks like
- Consistent annual mileage increases with no drops or implausible jumps
- Mostly passes, with any fails clearly resolved at the next test
- Few recurring advisories — and where they appear, evidence they were addressed
- No long unexplained gaps in the testing record
What the MOT history doesn't tell you
The MOT is a safety snapshot on the day of the test — it is not a guarantee of overall condition, and it doesn't cover accident or write-off history, outstanding finance, or whether the car has been stolen. For those you'll need a full vehicle history check alongside the free MOT data.
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