Car Failed Its MOT? What to Do Next, Step by Step

An MOT failure is a piece of information, not a crisis. What turns it into a crisis is acting on the wrong assumption in the first hour — driving a car you should not have moved, authorising a repair bill you did not need to accept, or letting the retest window close.

This guide works through the decisions in the order you actually face them.

Read the refusal notice before you agree to anything

When a vehicle fails, the test station issues a VT30 refusal of an MOT test certificate. The result is recorded on the central database immediately, so it is already part of the vehicle's public history before you have left the waiting room.

The document lists every defect found, each one graded. Since May 2018 the grades have been dangerous, major, minor and advisory, and the distinction determines everything that follows:

Read the notice properly rather than skipping to the total at the bottom of the quote. Find the failure items, separate them from the advisories, and check whether the word "dangerous" appears anywhere. Advisories are not repairs you have to make now, and being quoted for them alongside genuine failures is one of the more common sources of an inflated bill.

You are also entitled to ask the tester to show you the defects on the vehicle. A reasonable garage will put it back on the ramp and point at the worn ball joint or the corroded sill. If a garage will not do that, treat it as a signal.

Can you legally drive away?

Three scenarios, three different answers.

Your old certificate is still valid and there are no dangerous defects. You may drive the car normally. A failure does not retrospectively cancel a certificate that has not yet expired — the certificate runs to its printed date. This surprises people, but it is the position, and it is why testing early gives you a genuine repair buffer.

A dangerous defect was recorded. You must not drive the vehicle away, and the valid certificate makes no difference. Driving a vehicle that has failed with a dangerous problem exposes you to a fine of up to £2,500, three penalty points and a driving ban. In practice you need the repair done on site, or recovery.

Your certificate has already expired. The vehicle can only be driven to a pre-arranged repair appointment or to a pre-booked MOT test. Anything else is driving without a valid MOT, with a fine of up to £1,000, and it removes the ability to tax the vehicle when the current tax runs out.

The insurance dimension sits underneath all three. Policies routinely require the vehicle to be maintained in a roadworthy condition. Knowingly driving on a recorded dangerous defect is very difficult to defend if you then have an accident.

Deciding where to have the work done

You are under no obligation to have the repairs carried out by the garage that failed the car. But the choice has a cost attached, because the retest fee rules are tied to the station that did the original test.

Repairing at the testing station

The strongest financial case. If you leave the vehicle there for repair and it is retested before the end of the tenth working day following the test, no retest fee may be charged at all. It is also the least hassle: no second journey, no legal question about moving the car.

The obvious concern is the incentive. A station that both tests and repairs profits from the work it identifies. That is not, in itself, evidence of anything — most garages are straight, and MOT testers work under DVSA scrutiny with their own licences at stake. But it is a reason to ask for the defects to be shown, ask for an itemised written quote, and be willing to make a call before you agree.

Taking it elsewhere

An independent garage or a marque specialist may be substantially cheaper on parts and labour, and for some jobs — welding, suspension work, diesel emissions — specialist experience genuinely matters. Weigh the saving against the retest fee you may then pay, and against the risk of a second failure if the repair is not carried out to test standard.

If you do take it away, you must be able to move it legally, which brings you back to the three scenarios above.

Doing it yourself

Bulbs, wiper blades, washer fluid, number plates, mirrors and tyres are well within the reach of an owner with basic tools, and these are exactly the items covered by the free next-working-day retest. Brakes, structural corrosion, suspension and emissions work are not places to learn, because the standard applied is a measured one and a job that looks finished can still fail.

Controlling what you agree to

The failure notice tells you what must be fixed. The quote tells you what a garage would like to fix. They are rarely the same document.

Separate the failures from the advisories before you discuss price. Advisories are not repairs the law requires. Some are urgent in substance — a tyre at 2mm is legal today and illegal in a few thousand miles — but many are not, and a quote that silently bundles them into the total makes an ordinary failure look like a major bill.

Ask for the quote in writing, itemised by defect. Parts and labour separately, per item. This makes it possible to compare with another garage and to decline individual lines.

Query anything that appears without warning. Look at the previous test. A component that has never been advised on and suddenly fails is not impossible, but it is worth asking to be shown.

Authorise nothing you have not priced. Approve specific work at a specific figure, and say so clearly. "See what it needs" is how bills get away from people.

Be realistic about diagnosis. Some failures, particularly emissions and brake imbalance, need investigation before anyone can quote accurately. A diagnostic charge is legitimate; an open-ended one is not.

The retest clock

Two deadlines matter, and they are different things.

The first is your certificate expiry. Repairs do not extend it. If your MOT ran out the day of the test, the car is off the road until it passes.

The second is the retest fee window. Get the vehicle retested at the same station before the end of the tenth working day following the original test and you need only a partial retest, covering the failed items rather than a full inspection. Take it somewhere else, or leave it longer than that, and you pay for a complete new test at the full fee — a maximum of £54.85 for a car. Only one partial re-examination is permitted per full test, so there is no scope for repairing in instalments. The detail of who pays what, and the list of items that qualify for a free next-day retest, is set out in our guide to MOT retest rules and fees.

Working days exclude weekends and bank holidays, which quietly extends the window over a bank holiday weekend and is worth counting rather than estimating.

When the result may actually be wrong

Most failures are correct. Some are not, and there are two situations worth taking seriously.

The first is a genuine dispute about a measurement or a judgement — a windscreen chip assessed as being in zone A when you believe it is not, corrosion recorded as structural when it is surface rust on a non-prescribed area, or play in a joint graded major when it looks marginal. Grading involves defined thresholds but also assessment, and assessments can be wrong.

The second is a failure item you do not recognise at all, particularly on a car with a clean recent history. Look at the vehicle's previous tests before you accept it. If a component has never been advised on and suddenly fails outright, that is not impossible, but it is worth a question. Our defect library explains what the common failure descriptions actually mean in plain English, which makes it much easier to have that conversation.

A second opinion from another test station is the pragmatic first step, and it is cheap relative to a large repair bill. Be aware, though, that a second test creates a second record — and if the car genuinely is defective, you now have two failures on the history.

How to appeal an MOT failure

If you believe the result is wrong, there is a formal statutory route.

1. Ask for form VT17, the notice of appeal. Every test station must make it available on request, and it is also published on GOV.UK.
2. Send it to the DVSA customer service centre within 14 working days of the date of the failure, by email or post. Miss the deadline and the statutory appeal is gone.
3. Do not repair, adjust or alter the vehicle in the meantime. Any change can make it impossible to assess what condition the car was in at the time of the test, and the appeal will usually fail on that basis alone.
4. A DVSA vehicle examiner will contact you within five working days to discuss it and, if appropriate, arrange a re-examination at a time and place agreed with you.
5. You pay the appeal fee before the examiner starts — the maximum test fee for the vehicle class, £54.85 for a car. If the vehicle passes the appeal test, the fee is refunded.

The original result stays on the vehicle's MOT history either way; the appeal outcome is added alongside it rather than replacing it.

The deadlines differ if you are complaining that a vehicle should not have passed — for example, you have just bought a car with a fresh MOT and found something that plainly should have failed. There the limit is 28 calendar days from the test for most defects, and three months where the problem is corrosion-related.

Appeals about the test result are separate from complaints about a garage's conduct, pricing or customer service. Those go to DVSA as a complaint, or to trading standards, and they do not change the test outcome.

What a failure does to your tax

The connection catches people out at the worst moment. You cannot renew vehicle tax without a valid MOT in place, so a car that fails close to its tax renewal date has two problems rather than one.

If the certificate is still valid, the tax can be renewed as normal and nothing changes. If it has expired, the tax renewal is blocked until the vehicle passes. Continuing to drive at that point means driving both untested and, once the tax lapses, untaxed — separate offences, each with its own penalty, and the second is enforced automatically from DVLA records without anyone needing to stop you.

If the repair is going to take weeks, or you are deciding whether to keep the car at all, make a SORN declaration and keep the vehicle off the public road. That stops the tax obligation cleanly and can be reversed as soon as the car passes.

When the car is not worth repairing

At some point the arithmetic turns. A £900 welding job on a car worth £1,200 is not a repair decision, it is a disposal decision, and it is better made deliberately than after you have already spent £400 on the suspension.

Three things are worth doing before you commit:

• Get the quote itemised into failure items and advisories, and price the failures alone.
• Check what the car is actually worth in failed condition, not in the condition you remember it being in.
• Look at the pattern in its history. A car that has failed on structural corrosion is rarely finished failing on structural corrosion. A car that failed on a snapped spring is. You can pull the full record for any registration on the MOT history checker and read the last several years of defects and advisories in one place.

If you decide to sell or scrap it, be straightforward about the failure. The result is public, and any buyer who checks the registration will see it.

After it passes

The retest produces a new certificate with a fresh expiry date, and the pass appears on the public record beneath the failure. That pairing is normal and not something a future buyer should hold against the car; what matters to them is whether the same item keeps recurring.

Two habits prevent a repeat. Read the advisories on the new certificate, because they are a tester telling you in writing what is going to fail next year. And book earlier next time — testing inside the month before expiry preserves your renewal date while giving you weeks of legal driving in which to fix anything that comes up.