Key takeaways
- Tyres are among the most common MOT failures, usually for tread below the 1.6mm legal minimum or for cuts, bulges and exposed cords.
- Tread below 1.6mm, bulges and exposed cords are dangerous defects, so the car must not be driven until the tyre is replaced, which is why replacing it where the car stands makes sense.
- Mobile fitting can replace failed tyres at the test centre, your home or work, often the same day, so you avoid a retest delay.
- Once the new tyre is fitted, the centre can re-test the item and pass the car, getting you road-legal quickly.
Failing the MOT on a tyre is frustrating, but it is one of the quickest faults to put right. Tyres are a common failure item, and most of the reasons are simple: worn tread, a cut, a bulge or the wrong tyre fitted. This guide covers why tyres fail, whether you can legally drive away, and how same-day mobile fitting gets you road-legal without leaving the car at a garage.
What happens if you fail your MOT on tyres?
If your car fails the MOT on a tyre, what you can do next depends on how the fault is graded. The DVSA inspection manual lists tread below the legal minimum, and a lump, bulge or tear with cords exposed, as dangerous defects, and a car with a dangerous defect must not be driven until it has been repaired. Once a compliant tyre is fitted, the centre can re-test that item and issue a pass.
Some tyre faults are graded major instead, such as tyres of different structure on the same axle. With a major defect, gov.uk says you can take the car away if your existing MOT certificate is still valid, but it must still meet the minimum standards of roadworthiness, and an illegal tyre is an offence on the road whatever the certificate says. The practical answer is almost always to replace the tyre before the car moves.
Why do tyres fail the MOT?
Tyres fail the MOT for a handful of clear reasons under the DVSA testing manual. The most common is tread below the 1.6mm legal minimum across the central three-quarters. Others include cuts, bulges, exposed cords, perished rubber, an under-inflated or wrongly seated tyre, and the wrong size or type fitted across an axle.
Many of these are easy to spot before the test. A quick tread check and a look round each tyre for cuts and bulges will catch the majority. The wrong-tyre failures usually come from a mismatched pair fitted across an axle, which is worth checking if you have had tyres replaced cheaply.
How quickly can a mobile fitter get you road-legal?
Often the same day. A mobile fitter can come to the test centre, your home or your workplace, supply the correct tyre and fit it on the spot. We aim to arrive within 30 to 60 minutes, and the fitting takes 20 to 30 minutes once the fitter is with the car. Because there is no need to drive an unroadworthy car anywhere, it removes the awkward part of a tyre failure entirely.
Once the new tyre is on, the test centre can re-inspect that item and pass the car, and gov.uk lists wheels and tyres among the items that can be retested free if the car goes back by the end of the next working day. Fitting at the car also means you are not left stranded after a fail or forced to risk driving on a tyre the tester has just marked as dangerous.
Can you drive on a tyre that failed the MOT?
Generally no. Driving on a tyre below 1.6mm, or with a cut, bulge or exposed cord, is an offence in its own right, carrying a fine of up to £2,500 and 3 penalty points per tyre, according to gov.uk. The exception people half-remember, driving to a pre-arranged repair or test, applies to a car whose MOT has expired. It does not make an illegal tyre legal, and a dangerous defect rules out driving the car at all.
This is exactly why same-day mobile fitting suits a tyre fail so well. Rather than gamble on driving an unroadworthy car to a garage, you have the replacement brought to wherever the car is. It keeps you legal, avoids the penalty risk, and gets the car back through its test sooner.
How can you avoid a tyre MOT failure?
A five-minute check before the test catches most tyre fails. Check the tread is comfortably above 1.6mm, ideally around 3mm, look round each tyre for cuts, bulges and exposed cords, and make sure the pressures are correct. If a tyre is borderline, replacing it before the test is cheaper than a retest and the wasted trip.
Failed on tyres? Get back on the road
A tyre fail is one of the easiest MOT problems to clear. Our guide to the most common tyre MOT failures explains each reason in detail, and UK tyre laws and fines covers the penalties for driving on an illegal tyre. When you need a failed tyre replaced where your car is, Fast Tyre brings mobile tyre fitting to the test centre, your home or work across London and the surrounding counties. With same-day tyre fitting the replacement is done the day you call, so the car can go back for its retest without losing another day to a garage booking.
Frequently asked questions
Not if the tyre was failed as dangerous, which covers tread below 1.6mm and bulges or exposed cords: the car must not be driven until it is fixed. Driving on an illegal tyre is also an offence in its own right, risking up to £2,500 and 3 points per tyre, whatever your MOT status.
Often the same day. A mobile fitter can come to the test centre, your home or work, supply the correct tyre and fit it, with arrival usually within 30 to 60 minutes and the fitting itself taking 20 to 30 minutes. The centre can then re-test the item and pass the car, avoiding a wasted trip.
Then the car cannot be driven or parked on the road except on the way to a pre-arranged MOT test or to somewhere it is being repaired, and even that journey needs legal tyres. If a tyre is below the limit or damaged, having it replaced where the car is parked is the straightforward way round it.
Often not. Wheels and tyres are on the gov.uk list of items that can be retested free if you take the car back by the end of the next working day, and a partial retest fee may apply within 10 working days. Fitting the new tyre at the centre keeps it simple and avoids a separate trip.
Yes, on cars first used from 2012. A TPMS warning light showing a fault is an MOT failure, so sort it before the test rather than risk a fail for it. If the light is on, have the cause checked, as it may be a leak or a faulty sensor.