Reading an MOT advisory: six words on the paperwork that actually matter
An MOT advisory is not a free pass and it is not a failure. It is a graded signal using language the DVSA defines precisely. Here is how to read it.
Open the second page of your MOT certificate. Under the pass line sits a block of advisories: short sentences that describe faults the tester noticed but did not count as immediate reasons to fail the car. Most British drivers read this block once, nod uncertainly, and put it in a drawer until the next test. That is a mistake, because the wording of advisories is not casual — the Driver and Vehicle Standards Agency publishes a 190-page MOT inspection manual that tells testers exactly which words to use for which severity of fault. Learning the vocabulary makes the advisory block legible.
Six words do most of the work. Learn them in roughly this order of alarm: play, wear, corrosion, pitted, close to, and seepage. Each means something specific. Four of them are warnings about where the car will be in twelve to eighteen months; two are warnings about where it is now.
"Play" — mechanical slack in a joint
A tester reporting "play in offside front lower ball joint" means the joint has developed free movement that it should not have. Play is measured in millimetres; the MOT manual sets tolerances for each joint type. An advisory means the play is within tolerance but visible — i.e. this joint will fail its next MOT if left alone.
The joints most commonly flagged: ball joints (steering and suspension), track rod ends, anti-roll bar links. The fix is usually £50-£150 per joint at an independent garage; the DIY path exists but requires specific ball-joint separators. If play is reported on a steering component, do not run the car to the next MOT and hope — steering joints that are already advisory can transition to failure between tests in six months of hard winter driving, and the failure mode is total loss of steering feel at the wheel.
"Wear" — a wear part approaching its service limit
"Wear" is a softer word than "play" and usually describes consumables: brake pads, brake discs, tyres, wiper blades. "Brake pad(s) wearing close to minimum thickness" means the tester measured the pad and found it at 2-3mm — below 1.5mm is a fail.
Brake wear advisories are the most common type on the MOT certificate and also the most routinely overactioned. A pad at 3mm has 6,000-10,000 miles of life left depending on your driving. There is no safety reason to replace it that afternoon. The right habit is to get a price for pads-and-discs if the tester mentions wear on both (on most modern cars they are replaced as a pair; disc minimum thickness is stamped on the disc edge), and to book the work for a convenient weekend in the next two months.
Tyre wear is the one exception: the MOT fail threshold is 1.6mm across the central three-quarters of the tyre; an advisory of "tyre wearing close to limit" means 2.0-2.5mm. Winter tyre handling degrades sharply below 3mm, so acting on a tyre advisory before December is reasonable even if the tyre has months of MOT life left.
"Corrosion" vs "corroded" — two different problems
This is the pair of words that catches drivers out. The MOT manual draws a sharp distinction. "Corrosion" (as a general description) on an advisory is a note that rust is present but has not yet compromised the structural function. "Corroded" (used as an active verb — "brake pipe is corroded") on a failure sheet means function is already compromised.
On an advisory, "corrosion on front subframe" or "surface corrosion to underbody" means the tester found rust worth noting. Treatment with a wire brush and a coat of Hammerite is a Saturday morning. If left for two or three winters on a British coastal car, surface corrosion becomes structural and the next MOT is a fail with a £300-£600 repair.
The GOV.UK structural-corrosion section explains the test zones and prescribed areas that must be solid; brake pipes, suspension mounting points, fuel lines, and seat belt anchorages are tested specifically and will fail outright if corrosion has reduced section.
"Pitted" — surface damage, usually to a brake disc
"Brake disc(s) pitted" or "brake disc(s) scored" is an advisory that does not mean the car is unsafe today but tells you the disc surface is no longer flat. The cause is usually corrosion from a car that sat unused, or a pad that worn down past its backing plate, or road grit caught in the caliper.
A lightly pitted disc produces mild judder under braking at motorway speeds; a deeply pitted disc is a fail. Discs with "pitted" on the advisory should be replaced with the next pad change, which is often around the same mileage anyway. On most modern cars discs are £30-£80 per axle for genuine parts, and most independent garages fit them for £80-£120 labour per axle. Mintex, Brembo and Pagid are the three reliable aftermarket brands; the Car Mechanic magazine group did a disc-and-pad comparison that is a reasonable starting point.
"Close to" — the explicit countdown
When an advisory contains "close to" (as in "brake pad close to legal minimum", "tyre close to legal limit", "suspension bush close to failing"), it is the DVSA tester's explicit way of saying this part will fail the next MOT. Not might fail. Will fail. The tester has measured it and recorded a value just inside the legal tolerance.
Treat "close to" items as booked work for the next three to six months, not the next twelve. If a car has multiple "close to" advisories — three or four — you are looking at an annual service bill in the £500-£800 range even at independent garage rates. This is where the cost of ownership of an older car starts to show.
"Seepage" — not a leak yet, but on the way
"Seepage" on the advisory block describes a fluid line, hose, or seal that is showing dampness without actively dripping. Engine oil seepage, power steering seepage, shock-absorber seepage, brake caliper seepage all have their own entries in the MOT manual.
Engine-oil seepage is cheap to live with — rocker cover gaskets are £40 plus two hours' labour on most four-cylinder engines, and seeping engines run fine for years. Brake fluid seepage is the opposite: if a caliper or wheel cylinder is reported as seeping, replace it before the next long journey, because brake fluid is hygroscopic and a seeping brake system takes on moisture and loses effective boiling point. A braking system that boils fluid on a long descent — think the A82 down to Glencoe — is how braking failures happen.
Shock absorber seepage indicates the shock is near the end of its sealed life. Shock absorbers rarely cause an MOT failure directly (unless they are visibly damaged or the car bounces persistently on the brake-test plates), but a seeping shock has perhaps 15,000 miles of useful damping left. Plan replacement, do not panic.
What is missing from the advisory block
Two important things never appear on an MOT advisory and are easy to assume will. Engine condition is not tested — a car can pass MOT with a knocking big-end or a failing clutch. The MOT tests safety and emissions compliance, not drivability. If your car has a mechanical issue the garage has not written on the certificate, the advisory block is silent on it.
Service items are also not tested. A cambelt on a cambelt car can be seven years overdue and still MOT-pass; the tester has no way of knowing when it was last changed. The only record is the service history and your receipts. For older cars with uncertain history, the GOV.UK MOT history check shows every pass, fail and advisory going back years — a free diagnostic tool before buying a used car worth running on any plate before the test drive.
What to do with the advisory sheet
Keep it. Specifically, keep it with the service history so the next MOT in twelve months can be compared against this one. The useful comparison is not pass-or-fail; it is which advisories recur. A ball joint that was advisory last year and now reads "close to" has moved materially closer to failure, and the garage should see the trajectory not just the snapshot.
Take it to the garage that will do the work, not necessarily the garage that did the test. MOT testers and service garages are often the same building but different trades. A good independent service garage will read the advisory sheet, price the work honestly, flag which items can safely wait, and tell you if any of the tester's notes look overcautious. That conversation is £0 to have and saves money on the quote.
And ignore nothing with "close to" on it. Those are the ones that become MOT fails, and MOT fails are the ones that strand cars at garages overnight and cost £400 in parts that would have been £120 if booked when the advisory was fresh.