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What MOT advisories actually mean
An MOT certificate can carry five different kinds of remark, and only two of them fail the test. Knowing which is which is the difference between walking away from a good car and buying a bad one.
The five things a tester can write down
Dangerous
FailA direct and immediate risk to road safety, or a serious environmental problem.
The car must not be driven until it is repaired — not even away from the test centre.
Major
FailSomething that may affect the vehicle’s safety, put other road users at risk, or harm the environment.
Must be repaired and the car retested before it can be used on the road.
Minor
PassA fault with no significant effect on safety or the environment — but a real fault, recorded on the certificate.
The car passes. Repair it as soon as possible; a minor rarely stays minor.
Advisory
PassSomething the tester thought was worth writing down: wearing, corroding, or heading towards a fail.
Monitor it. On a car you are buying, this is the section worth reading twice.
PRS
Pass“Pass after Rectification at Station” — a defect was found during the test and fixed there and then.
Already repaired, so not outstanding work. Worth asking what was done, and by whom.
Minor, advisory and PRS all appear on a certificate the car passed. That is why “it has a full MOT” and “it has nothing wrong with it” are different statements.
An advisory that keeps coming back is the one to worry about
A single advisory is often just wear. The same advisory two years running is different: it was seen, written down, and left. That is a maintenance answer as much as a mechanical one, and it is the strongest question you can put to a seller.
The reverse matters too. An advisory that appeared last year and not this year was almost certainly dealt with — asking the seller to account for it makes you look like you cannot read a date. AutoSpect only raises the ones the current certificate still carries.
Real advisories, translated
Every one of these is from an example report, exactly as the tester wrote it, with what it actually means and roughly what it costs.
Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
Flagged at the 2025 test and NOT repeated at the 2026 test 7,600 miles later, which suggests they were replaced. Ask for the receipt — if there is not one, budget for pads all round.
From the Diesel hatchback example report
Nearside and Offside Front Tyre worn close to legal limit (5.2.3 (e))
Both fronts were close to the limit in 2025 and clear in 2026, so they have almost certainly been changed. Check the date codes on the sidewalls to confirm, and check the rears while you are down there.
From the Diesel hatchback example report
Front Shock absorbers has light misting of oil Both (5.3.2 (b))
Recorded once in 2022 and never again. Misting is a weep rather than a leak; if it had turned into a real leak it would have failed by now.
From the Diesel hatchback example report
Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Legal at the test but close to the 1.6mm limit, and "worn on edge" hints at alignment rather than age. Check it with a 20p coin, and if it has been replaced without the geometry being corrected the new one will wear the same way.
From the Hybrid SUV example report
Front brake discs lightly corroded at the edge (1.1.14 (a) (ii))
Almost universal on EVs: regeneration does most of the slowing, so the friction brakes are barely used and the discs surface-rust instead of wearing. Usually harmless and cleans off with a few firm stops, but check for deep scoring and a rough feel through the pedal.
From the Electric SUV example report
What does PRS mean on an MOT?
PRS stands for Pass after Rectification at Station. The tester found a defect that would have failed the car, it was repaired at the test centre during the same visit, and the car then passed. The certificate records a pass; the fault is listed so you can see something was fixed. Buying that car, ask what the fault was and who fixed it — a PRS for a blown bulb is nothing, a PRS for a brake component is worth a receipt.
What the numbers in brackets are
Advisories usually end in something like (5.2.3 (e)). That is a reference
to the section of the MOT inspection manual the tester worked from — useful to a
garage, meaningless to a buyer, and definitely not something to read out to a seller.
AutoSpect strips it before it ever reaches you.
Testers also write in their own style, which is why you see “Nearside Front Tyre” with capitals in the middle of a sentence. Same treatment: it gets tidied before you read it.
Read the MOT history of the car you are looking at
Every test, every advisory, every failure — free, from the official DVSA record, with the repeats called out. No account, nothing to install.
A repeat advisory is also the cheapest thing to raise before you travel — it is one of the questions to ask on the phone, and the answer tells you as much about the owner as the car. What the sheet cannot tell you is the state of the thing today, which is what to check when you are stood at the car.
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Definitions follow DVSA’s MOT testing terminology. Costs are typical UK ranges rather than quotes, and AI analysis is a probabilistic tool, not a certification.