Reading MOT History

Why does MOT history matter?

Every MOT test since 2005 sits in a national DVSA database: the date, the result, the mileage on the clock, and every defect and advisory the tester recorded. The testing garage logs it, not the owner, which makes it the closest thing a used car has to an honest diary. Adverts are written to sell; the MOT record just says what happened.

A current MOT certificate on its own tells you almost nothing, because it only proves the car scraped past minimum standards on one particular day. The value is in the pattern across years. Read properly, ten minutes with the history tells you whether the car was looked after or merely patched up before each test, what is about to need money spending on it, and occasionally that you should not buy the car at all.

What is actually in an MOT record?

Each test entry shows the result, the mileage at the time, the expiry date of the certificate and a list of any defects, graded as dangerous, major or minor, plus advisories. Reading the entries top to bottom gives you the headline: a string of clean passes, or a sawtooth of fails and retests. The mileage column deserves its own pass through, because readings should climb steadily; a typical UK car adds somewhere around 7,000 to 10,000 miles a year.

One quirk of tester language trips up almost everyone: nearside means the passenger side (nearest the kerb) and offsidemeans the driver's side. So "offside front tyre worn" is the front tyre on the driver's side. Once you know that, the defect descriptions read like plain English.

What do advisory notes really mean?

An advisory is the tester telling you something is wearing out but has not yet crossed the legal line. "Brake pads wearing thin", "tyre approaching the legal limit", "slight play in a steering joint", "corrosion starting on the rear sill": none of these fail the test, all of them are bills with a delay on them. A tyre advisory typically needs acting on within months; light surface corrosion might be fine for years. The skill is treating each advisory as a question: was it dealt with by the next test, or is it still there?

That question is the single sharpest test of how a car was maintained. An advisory that appears once and is gone by the following year means an owner who fixed things. The same advisory copied forward three years in a row means an owner who did the bare minimum, and you should assume the parts of the car the MOT does not check, like the engine oil and the gearbox, got the same treatment.

What are the red flags?

The hardest red flag is a mileage that goes backwards or barely moves between tests. That is the signature of clocking, which is fraud, and it poisons every other number in the record; if the mileage is fake, the "low mileage" price premium is fake too. Run the plate through our mileage check, which plots every recorded reading on a timeline and flags anomalies automatically. If the line dips, walk away unless the seller can document a genuine reason, such as a replaced instrument cluster, in writing.

The subtler flags are patterns. A fail followed by a pass the next day, repeated over several years, means the car only ever gets attention when the law forces it. Corrosion advisories that progress from "surface rust" to "corrosion affecting structural integrity" are heading towards welding bills or a write-off, because rust never improves on its own. Repeated emissions failures hint at engine wear that costs far more than the catalytic converter the seller will blame. And any dangerous defect in the history deserves a direct question: what was it, who repaired it, and is there an invoice?

A long gap in the record matters too. A car with no MOT for eighteen months was either declared off the road or driven illegally; either way, ask what happened during the gap and treat "it was just sitting on the drive" as something to verify, since cars deteriorate when parked as well as when driven.

What does a good MOT history look like?

Mostly, it looks boring. Mileage climbing in steady, believable steps. Passes year after year, with the occasional advisory that disappears by the following test. Wear items like tyres, pads and discs showing up as advisories and then being dealt with. Tests booked around the same date each year, often at the same garage, which suggests a settled owner with a regular mechanic rather than someone shopping for a lenient tester.

Do not demand perfection from an older car. A twelve-year-old hatchback with one failed test for a worn tyre, fixed the same week, is a better bet than a car whose record is suspiciously spotless because it only ever did 2,000 miles a year and sat still the rest of the time. Context beats any single entry.

How do I use MOT history when buying?

Check the history before you travel to see any car; it is free and takes less time than the drive. When something in the record raises a question, write it down and ask the seller in person. Their reaction tells you as much as the answer: a good owner knows their car's history and answers without hesitating.

Then use the record as negotiation material. Advisories are priced repairs waiting to happen, so get a rough quote for each outstanding one and put it on the table: "the last MOT flagged both rear tyres and a corroded brake pipe, that is about £300, and the price needs to reflect it." It also works in reverse as a lie detector. A seller claiming "new brakes last year" should not have a brake advisory from eight months ago, and "one careful lady owner" sits badly with three dangerous defects in five years. When the story and the record disagree, believe the record.