What to Look for in MOT History When Buying a Used Car
The MOT history is one of the most useful checks you can do when buying a used car. It is free, takes seconds to pull up, and contains information the seller almost certainly will not volunteer.
But knowing how to read it is just as important as checking it. This guide covers what each part of the record means, what to flag, and what does not actually matter.
What the MOT history contains
Every MOT test is logged on the DVSA database and includes:
- The date of the test
- Whether the car passed or failed
- The mileage recorded at the test
- Any failure reasons if the car did not pass
- Any advisories noted during the test
- Any minor defects recorded
Tests going back to 2005 are available for most vehicles. That gives you a window of up to 20 years of history on an older car.
Mileage: the most important number
Mileage should only ever go up. A recorded mileage at one test that is lower than the previous test is a near-certain sign the odometer has been wound back. This is called clocking and it is illegal. Do not buy a car with this in its history unless you have an extraordinary explanation from the seller that you can independently verify.
A car that shows almost identical mileage across two or three tests suggests it has barely been used during that period. That can be legitimate (a second car, a lockdown car, a restoration project). But it can also indicate the recorded mileage does not reflect actual use. Ask the seller what the car was doing during those years.
Mileage that increases consistently at a believable rate (roughly 8,000-15,000 miles per year for most cars) is a strong positive signal. It tells you the car has been in regular use and the mileage is likely genuine. Cross-check the total mileage against the car's age and the seller's stated use.
Pass and fail history
A car that passes its MOT every year without failures tells you it has been maintained to at least a minimum standard. Not every well-maintained car has a perfect record, but a clean pass history is reassuring.
One failure for a bulb, a wiper blade, or a tyre close to the limit years ago is nothing to worry about. These are normal wear items and a single failure that was promptly fixed tells you nothing worrying about the car.
A car that fails for the same reason on two or more tests in a row has an ongoing problem that has not been properly fixed. Whether it is brakes, emissions, or suspension, a recurring failure means the underlying issue is still present. Budget for a thorough inspection and potentially significant repair costs.
Occasionally a car shows a failure at one garage and a pass at a different one on the same day. This can mean the owner shopped around for a pass rather than fixing the problem. It does not always mean fraud, but it is worth noting and asking about.
Advisories
An advisory that appears on one test and is absent from the next tells you the owner addressed it. That is exactly what should happen. One-off advisories that were resolved are not a concern.
The same advisory appearing on multiple consecutive tests means the owner has been ignoring it. Worn brake pads left year after year eventually become dangerous and more expensive to fix. Ignored advisories tell you something about how the car has been cared for, and suggest there may be other deferred maintenance you cannot see.
Rust on body panels is cosmetic. Rust noted on a structural or load-bearing component is serious. An advisory for structural corrosion means a tester spotted deterioration that had not yet reached failure threshold. On a UK car, corrosion progresses. If this advisory appears more than once in the history, inspect the underside carefully before buying.
Gaps in the history
Cars need an MOT every 12 months. A gap longer than that means the car went a period without a valid MOT. This is sometimes innocent (laid up during illness, kept off-road, exported temporarily) but it is always worth asking the seller to explain. A period of unknown history is a period of unknown condition.
How to check MOT history on every listing
The full MOT history for any UK-registered car is free to check at check.mot.gov.uk. Enter the registration and you get the complete record going back to 2005.
The Don't Buy A Lemon Chrome extension does this automatically on every listing you browse. It reads the registration from the listing photos and shows the full history inline, without leaving the page. It works on AutoTrader, Facebook Marketplace, eBay Motors, Gumtree, and more.
Frequently asked questions
How far back does MOT history go? DVSA records are available back to 2005 for most vehicles. Cars first registered after 2005 should have a complete digital record.
Does a valid MOT mean the car is in good condition? No. An MOT confirms the car met the minimum legal standard on the day it was tested. It is not a health check. A car can pass its MOT with advisories that need attention, and condition can change between tests.
What if a car has no MOT history at all? This usually means the car is less than three years old, has been recently imported, or has always been kept off the public road. Ask the seller which applies. A car with no UK MOT history and no clear explanation for the gap is worth treating with caution.
Is MOT history enough on its own? MOT history is one of the most useful checks, but it does not cover finance, stolen status, or write-off history. A full picture requires a paid history check (HPI, RAC, or AA) alongside the MOT record.