Top 10 MOT Failures in the UK (And How to Fix Them)

Introduction

Every year, millions of vehicles across the UK go through their annual MOT test — and many fail for avoidable reasons. Whether you're a seasoned driver or a new car owner, knowing the most common causes of MOT failures can save you time, money, and hassle.

Here are the top 10 most common MOT failures and how to fix them before your next test.

1. Lights and Signalling

Problem: Faulty brake lights, indicators, or number plate bulbs.

Fix: Check all lights regularly. Replacing a bulb is usually cheap and easy!

2. Suspension Issues

Problem: Worn shock absorbers, springs, or ball joints.

Fix: Listen for knocks or rattles and book a suspension check early.

3. Brakes

Problem: Worn pads or discs, uneven braking, or low fluid.

Fix: Have brakes checked regularly, especially if you notice a difference in stopping power.

4. Tyres

Problem: Tread depth below 1.6mm, damage, or uneven wear.

Fix: Use a 20p coin to check tread depth and keep tyres inflated correctly.

5. Visibility (Wipers & Windscreen)

Problem: Damaged wiper blades, chips, or empty screenwash.

Fix: Replace blades and top up screenwash. Fix any screen chips in the driver’s view.

6. Exhaust and Emissions

Problem: Noisy exhausts, leaks, or excess emissions.

Fix: Have your exhaust checked if it's unusually loud or if your emissions light is on.

7. Number Plates

Problem: Dirty, damaged, or incorrectly spaced plates.

Fix: Clean your plates before the test. Replace any unreadable ones with legal replacements.

8. Steering

Problem: Loose or worn steering components.

Fix: Get your steering inspected if it feels off-centre or makes noises.

9. Seat Belts

Problem: Frayed belts, faulty locks, or non-retracting belts.

Fix: Check all seat belts work properly and show no signs of damage.

10. Horn Not Working

Problem: Quiet or non-functioning horn.

Fix: Test your horn before your MOT. If silent, replace it in advance.

Book Your MOT for Just £29.50

Looking for an MOT test centre? Formula One Autocentres operates over 130 modern, DVSA-approved MOT testing stations throughout the UK. With their user-friendly service, you can easily book your next MOT online.

Ensure your vehicle stays roadworthy without overspending — Formula One Autocentres offers MOT tests for just £29.50.

Final Tip: Do a Pre-MOT Checklist

Most MOT failures can be avoided with a quick check beforehand. Book a pre-MOT check or give your vehicle a walkaround inspection. It's a simple way to stay roadworthy — and save money.

✅ Prevention is always cheaper than repair.

The UK’s Most and Least MOT-Friendly Cars

Based on an analysis of over 33 million MOT test results, here are the vehicles with the highest and lowest pass rates in the UK.