Why your MOT failed and what happens next

An MOT (Ministry of Transport) test failure means your vehicle did not meet the safety and emissions standards required by law in the UK. The test centre will give you a printed report listing every fault found — some are minor advisories, others are failures that prevent you from driving legally on public roads until they are fixed.

You have until your current MOT expires to get the vehicle repaired and retested. During that time, you can still drive to a garage for repairs, but not for any other purpose. Once repairs are complete, you return to any MOT test centre (not necessarily the same one) to have the vehicle retested.

The retest costs less than a full MOT — typically £25 to £35 depending on the test centre — and you do not need to book in advance at most locations, though calling ahead is sensible. If the vehicle passes the retest, you receive a new MOT certificate valid for 12 months from the date of the original test, not from the retest date.

Key Takeaways

  • Your MOT failure report lists every fault by category — read it carefully because some faults are dangerous and others are minor advisories that do not prevent retesting.
  • You can drive to a garage for repairs only; any other driving is illegal until you pass a retest.
  • A retest at any MOT centre costs significantly less than a full test and usually takes the same time.
  • If you pass the retest before your original MOT expires, your new certificate runs for 12 months from the original test date, not the retest date.
  • If your original MOT expires before you retest, you cannot legally drive the vehicle and must arrange collection by a recovery service or repair garage.

Reading your MOT failure report

The report divides faults into three categories: dangerous, major, and minor. Dangerous faults are safety-critical — faulty brakes, missing seatbelts, or severely damaged windscreens. Major faults affect safety or emissions but are less when ready critical — worn brake pads, a cracked headlight lens, or a leaking exhaust. Minor faults are advisories: they do not cause failure but flag wear or small issues you should monitor.

You must fix all dangerous and major faults before retesting. Minor faults do not prevent a retest, but the test centre will re-examine them during retesting and may upgrade them to major if they have worsened. Keep your failure report with you when you visit a garage — it tells the mechanic exactly what the MOT tester found and saves time diagnosing the vehicle.

If you disagree with a fault, you can request an independent retest at a different MOT centre, but you will pay the full MOT fee again. Most garages will inspect the fault for free and tell you whether the failure was justified before you decide to pay for a second test.

Getting repairs done before retesting

Take your failure report to a garage and ask for a quote on the faults listed. Some garages offer a "pre-MOT check" for a small fee — usually £20 to £40 — which inspects the vehicle against MOT standards and flags any other faults the original test centre may have missed. This can save money by preventing a second failure.

Authorised dealers and independent garages both carry out MOT repairs. Authorised dealers are often more expensive but may offer warranty on parts and labour. Independent garages are usually cheaper and can often fit you in quickly. Ask whether the garage can retest the vehicle themselves — many MOT test centres are also repair garages, which means you can have work done and retested in one visit.

Once repairs are finished, ask the garage to show you what was fixed. This helps you understand what went wrong and whether similar faults might develop elsewhere on the vehicle. Keep all receipts and invoices — they prove the work was done if a fault reappears within a reasonable time.

Booking and passing your retest

You can retest at any MOT test centre in the UK, not just the one that failed you. Use the GOV.UK MOT testing service website to find test centres near you and check their opening hours. Many test centres do not require advance booking for retests, but calling ahead is worth doing because some are busier than others and may have a wait.

Bring your original MOT failure certificate and proof of identity. The tester will re-examine all the faults listed on your failure report and check the rest of the vehicle as normal. If you have only fixed the listed faults and nothing else has deteriorated, you should pass. If new faults appear during the retest, you will fail again and receive a new report.

If you pass, you receive a new MOT certificate when ready. The certificate is valid for 12 months from the date of your original failed test, not from the retest date. This means you do not lose time on your MOT validity by retesting — you get the full 12 months from when you first tested.

What to do if your original MOT expires before you retest

If you do not retest before your original MOT certificate expires, your vehicle becomes illegal to drive on public roads. You cannot drive it to a garage, to an MOT centre, or anywhere else. If you are caught driving an expired MOT vehicle, you face a fine of up to £1,000.

If this happens, you have two options: arrange for a recovery service to tow the vehicle to a garage or MOT centre, or ask the garage to collect it. Some garages offer free collection if you book repairs with them. Once the vehicle is at the garage, repairs can proceed and you can retest without the vehicle being driven.

To avoid this, retest as soon as repairs are complete. Most garages can turn repairs around within a few days, and retesting takes the same time as a full MOT — usually 45 minutes to an hour. If you are waiting for parts, ask the garage for an estimated completion date and book your retest for a few days after that date.

Common reasons for MOT failure

The most frequent failures are worn brake pads, faulty lights, and tyre tread below the legal minimum of 1.6mm across the central three-quarters of the tyre. These are straightforward repairs that most garages can complete in a day. Suspension faults, exhaust leaks, and windscreen damage are also common and usually take one to three days to repair depending on parts availability.

Emissions failures — where the vehicle produces too much pollution — are less common in newer cars but more common in older diesels. These require specialist diagnostic equipment and may take longer to resolve. If your vehicle fails on emissions, ask the garage whether a software update, fuel system clean, or component replacement is needed, as costs vary widely.

Structural damage, rust affecting safety-critical areas, and major electrical faults are rarer but more expensive to fix. If your failure report includes these, get a detailed quote before authorising work. Some vehicles may not be worth repairing if the cost approaches the vehicle's value.

Preventing future MOT failures

Check your tyres monthly — look at the tread depth and may support all four tyres are inflated to the pressure listed on the driver's door jamb. Test your lights every few weeks by turning on headlights, brake lights, and indicators while parked. Listen for unusual noises from the engine, suspension, or exhaust, and have them checked by a garage if they persist.

Have your vehicle serviced on schedule according to the manufacturer's guidance — usually every 12 months or 10,000 to 15,000 miles, whichever comes first. A service includes checks on brakes, fluids, filters, and belts that often catch problems before they become MOT failures. Many garages offer a free pre-MOT inspection a few weeks before your test is due, which gives you time to fix any issues before the official test.

Keep records of all repairs and servicing. If a fault reappears shortly after repair, you can show the garage the invoice and ask them to investigate under warranty. Most garages offer a 12-month warranty on parts and labour, though terms vary.

Frequently Asked Questions

Can I drive my car with a failed MOT to get it repaired?

Yes, you can drive directly to a garage for repairs only. You cannot use the vehicle for any other purpose — shopping, commuting, or leisure driving — until you pass a retest. If you are caught driving for any other reason, you face a fine of up to £1,000.

How much does a retest cost?

A retest costs between £25 and £35 at most MOT centres, significantly less than a full MOT which costs around £55 for a car. Prices vary slightly by test centre, so call ahead if cost is a concern. Some garages offer retest discounts if you have repairs done with them.

What if I fail the retest?

You receive a new failure report listing the faults. You can fix them and retest again, paying the retest fee each time. There is no limit to how many times you can retest, but each failure costs money and time. If you fail repeatedly on the same fault, ask a different garage for a second opinion on whether the fault is genuine.

Does my new MOT certificate start from the retest date or the original test date?

Your new certificate is valid for 12 months from the date of your original failed test, not from the retest date. This means you do not lose any validity by retesting — you get the full 12 months from your first test appointment.

What if the garage says the repair cost is too high?

Get a second quote from another garage. Repair costs vary depending on parts prices and labour rates. For expensive repairs like suspension or engine work, comparing quotes can save hundreds of pounds. If the repair cost exceeds the vehicle's value, you may decide to sell the vehicle for parts or scrap instead of repairing it.