Introduction
An MOT advisory doesn't fail your car. Ignoring one is exactly how a cheap fix today turns into an expensive failure next year though.
Here's what advisories actually mean, how to read the specific wording, and what genuinely matters when you're weighing which ones to act on first. For the full breakdown of the MOT test itself, see our guide on the MOT test explained.
Summary:
- An advisory means your car passed, with a note flagging something worth watching before it becomes a genuine problem.
- Advisories aren't legally binding. You won't be fined for driving with one, and they don't affect your insurance on their own.
- Many advisories become next year's failure if ignored, often within 6 to 12 months depending on the item.
- Not all advisories carry equal urgency. Tyres and brakes deserve faster attention than minor cosmetic corrosion.
- A repeated advisory for the same item across multiple years is a genuine warning sign, particularly when checking a used car's history before buying.
What Is an MOT Advisory Exactly?
An advisory is a note a tester adds when something hasn't crossed the legal threshold to fail, but is worn, ageing or deteriorating enough to be worth watching. Your car passes regardless, and the advisory simply gets recorded alongside the certificate.
Since a 2018 overhaul, MOT results actually use four categories rather than a simple pass or fail: dangerous, major, minor and advisory. Dangerous and major faults both cause an automatic fail.
A minor defect is a formally defined standard that falls slightly short but isn't serious enough to fail on its own. An advisory sits a step below even that, closer to a tester's professional judgement call about where a component is heading than a strict, defined standard being missed.
Both minor defects and advisories let the car pass. Only one, the minor defect, is a formally recorded fault against a specific rule though.
How Are Advisories Actually Worded, and What Do They Really Mean?
Advisory wording tends to follow a fairly consistent pattern once you know what to look for. "Tyre worn close to the legal limit" means exactly that, tread depth is still above the 1.6mm minimum but getting close enough that it's worth replacing before the next test rather than waiting.
"Brake pads wearing thin" or "brake disc showing signs of corrosion" flags a braking component doing its job today but approaching the point where it won't be, worth noting against the fact that a typical set of brake pads lasts around 50,000 miles, giving you a rough sense of how much life might genuinely remain.
Suspension-related wording like "suspension bush showing wear" or "shock absorber has slight fluid leak" points to a component still functioning but starting the slow decline toward eventual failure. Corrosion advisories, often phrased as "slight corrosion noted" or similar, need a bit more nuance than the wording alone gives you. Surface or scale rust genuinely isn't an immediate concern. Rust that's started penetrating the metal can spread into structurally important areas over time though, eventually weakening the car enough to cause an outright fail.
General wear and tear, dents or scratches from everyday use, gets flagged too when a tester judges there's a genuine risk of a part working loose or falling off, rather than purely for cosmetic reasons. Worth remembering too that tester discretion plays a genuine role here. The exact wording and threshold for raising an advisory isn't perfectly standardised. Two different testing centres can occasionally reach slightly different conclusions on a borderline case as a result.
Which Advisories Should You Act On Immediately?
Not every advisory deserves the same urgency, and treating them all identically wastes both time and money.
Tyres and brakes sit at the top of the priority list since both directly affect your ability to stop safely and tend to worsen at a fairly predictable, steady rate rather than suddenly. An advisory on either is worth acting on within weeks rather than waiting for the next test. Suspension advisories generally allow a bit more breathing room, though shouldn't be left indefinitely since worn components can affect handling and braking distance as they deteriorate further.
Cosmetic items, minor surface corrosion away from structural areas or a small non-obstructing windscreen chip, for example, can genuinely wait longer without meaningful safety risk, though it's still worth keeping an eye on whether they're progressing.
What Happens If You Ignore an Advisory?
Nothing immediately, which is exactly why so many drivers let them slide. No fine, no invalidated insurance, no legal consequence at all for driving with one.
The real cost shows up later. Many advisories, tyre wear and brake wear especially, progress predictably enough that they become next year's actual failure if left completely unaddressed, sometimes within 6 to 12 months depending on how close to the threshold the item already was. Insurance specifically only cares whether your MOT is currently valid, not whether advisories exist on the certificate. There's no direct insurance risk from an advisory itself.
The practical risk is purely financial and safety-related: a scheduled, planned replacement of a worn tyre or brake pad costs less and carries less risk than waiting for it to fail the test outright, or worse, wearing past the legal threshold while you're still driving on it.
How Many Advisories Is "Normal" for a Car's Age?
Genuinely varies by age, and this ties directly into the pass rate patterns covered in our main MOT guide.
A newer car in its first few years of testing often comes through with few or no advisories at all, reflecting components that simply haven't had time to wear meaningfully yet. An older car, particularly one past the ten-year mark, accumulating a small handful of advisories at each test is fairly normal, given how many components are naturally ageing simultaneously by that point.
What matters more than the raw count is whether the same item keeps reappearing year after year. A car showing a fresh, different advisory each year suggests reasonably proactive maintenance between tests. The same advisory repeating for two or three consecutive years suggests the opposite, an issue being consistently deferred rather than addressed.
How Should Advisories Affect a Used Car Buying Decision?
Genuinely useful leverage, if you know how to read them properly.
Every car's full advisory history is available free through the official GOV.UK MOT history checker, and it's worth reviewing several years back rather than just the most recent certificate.
A repeated advisory for the same component across multiple tests is one of the clearer warning signs available to a used car buyer, suggesting a seller who's consistently deferred a known issue rather than a car that's simply developed one recent, isolated fault.
Outstanding advisories also give you genuine, specific negotiating room. Rather than a vague sense that "the car needs some work," you can point to exact, documented items, worn tyres or ageing brake components, for example, and factor the realistic cost of addressing them directly into your offer.
For the full process of checking a car's history properly alongside this, see our guide on how to check a used car's history.
Common Myths About MOT Advisories
"An advisory means the car sort of failed." No. The car passed outright. An advisory is a forward-looking note about a component's trajectory, not a partial or near failure.
"Advisories don't matter since the car still passed." Not quite. Many advisories predictably worsen into next year's actual failure if left unaddressed, making them genuinely worth acting on despite the current pass.
"Every advisory costs roughly the same to fix." Far from it. A tyre or brake advisory often means a genuinely necessary, moderately priced replacement, while a minor cosmetic corrosion note might cost nothing at all to simply monitor for another year.
Frequently Asked Questions
Can I drive with MOT advisories on my certificate? Yes, legally and without penalty since your car has genuinely passed. It's still sensible to address safety-relevant advisories like tyres or brakes promptly rather than waiting for them to worsen.
Do advisories affect my car insurance? No, not directly. Insurance only requires a currently valid MOT, and advisories on their own don't affect your policy.
Can I dispute an advisory I disagree with? Yes, you can raise a complaint directly with the DVSA if you genuinely believe an advisory was wrongly applied, though this is a relatively uncommon route in practice.
Do all MOT testers apply advisories the same way? Not perfectly. Advisories involve genuine tester judgement rather than a single fixed rule, meaning two testing centres can occasionally reach slightly different conclusions on a borderline case.
Should I get an advisory fixed before selling my car? Often worth it for safety-relevant items like tyres or brakes specifically since an unresolved advisory can become a genuine negotiating point in the buyer's favour, sometimes costing you more in a reduced offer than the repair itself would have cost.
Conclusion
An advisory is genuinely a gift, not a threat. It's the tester telling you exactly what's about to become a problem, well before it forces an expensive, unplanned fix or an outright failure. Reading the wording properly, prioritising tyres and brakes over cosmetic notes, and treating a repeated advisory on the same item as the warning sign it actually is turns this small print at the bottom of your certificate into one of the more useful pieces of information you'll get about your car all year. Ignore it, and that same advisory quietly becomes next year's bill.
In our own experience preparing used cars for sale, repeated advisories on the same item are exactly the kind of pattern we look for and address before a car reaches our forecourt, rather than leaving it for a buyer to discover later.
