If you own a vehicle in the UK, the annual MOT test is a legal requirement to ensure your car is safe to drive and meets environmental standards. Yet, despite knowing its importance, thousands of motorists still face an MOT failure each year. Understanding the 10 most common MOT fails, and more importantly, how to prevent them, can save you stress, time, and money.
Whether you’ve experienced a failed MOT in the past or want to make sure your car passes its next inspection with flying colours, this guide will help you avoid the pitfalls that cause many vehicles to fail their MOT.
1. Faulty Brakes
Brakes are one of the most critical safety components on your vehicle. Worn brake pads, damaged discs, leaking brake fluid, or unbalanced braking performance are among the most common reasons for MOT failures.
How to Avoid Brake-Related MOT Failures
- Schedule regular car maintenance and have your brakes inspected at least twice a year.
- Listen for squealing, grinding, or reduced braking efficiency.
- Replace brake pads and discs promptly when advised.
A common cause of MOT failure is uneven braking, which can be due to a worn shock absorber or corroded parts. Ensuring your braking system is in top condition not only helps you pass the MOT but keeps you and others safe.
2. Tyre Issues
Tyres play a huge role in road safety, yet tyre-related problems are a common MOT failure. Bald tyres, cuts, bulges, or incorrect tyre pressures can all cause a vehicle to fail the MOT test.
How to Avoid Tyre-Related MOT Failures
- Use the 20p test to check tread depth; it should be at least 1.6mm across the central three-quarters.
- Keep tyres inflated to the manufacturer’s recommended pressure.
- Inspect for cracks, embedded objects, or visible damage.
A worn tyre compromises grip and increases stopping distances, making it one of the top common reasons for MOT failures.
3. Suspension Problems
Faulty suspension is another major reason for an MOT failure. A damaged spring, leaking shock absorbers, or worn suspension arms can make your car unstable and unsafe.
How to Avoid Suspension-Related MOT Failures
- If you hear knocking noises or feel excessive bouncing, have your suspension checked.
- Pay attention to the way your car handles corners and bumps.
- Inspect the steering and suspension systems together, as they work in tandem for stability.
Failures are caused by suspension issues in a significant number of tests, making early detection vital.
4. Steering Faults
Your car’s steering system is essential for control and manoeuvrability. Problems like worn steering racks, leaks, or excessive free play can cause you to fail the MOT.
How to Avoid Steering-Related MOT Failures
- Listen for clunks or squeaks when turning.
- Ensure power steering fluid is topped up.
- Fix any wheel alignment issues promptly.
Poor steering performance not only risks an MOT failure but also makes driving dangerous.
5. Windscreen Damage
A chipped or cracked windscreen that obstructs the view of the road is a common reason for an MOT failure.
How to Avoid Windscreen-Related MOT Failures
- Repair chips early before they spread.
- Ensure wipers are working efficiently and replace blades when worn.
- Keep washer fluid topped up.
The tester will fail your MOT if damage larger than 10mm exists in the driver’s line of vision.
6. Emission Failures
Excessive emission levels are one of the most common MOT fails. This is often caused by a faulty catalytic converter, oxygen sensor, or neglected servicing.
How to Avoid Emission-Related MOT Failures
- Keep up with oil changes and engine servicing.
- Use quality fuel and consider a pre-MOT fuel additive.
- Drive your car for at least 20 minutes before the test to fully warm the engine.
A car failing its MOT on emissions may also be a sign of deeper mechanical issues.
7. Lighting and Indicator Faults
Broken headlights, brake lights, or indicator bulbs are one of the simplest yet most overlooked common failures during MOTs.
How to Avoid Lighting-Related MOT Failures
- Check all lights weekly, including the number plate and fog lights.
- Replace faulty bulbs immediately; it’s an easy DIY fix.
- Ensure your number plate is clean and clearly visible.
8. Seat Belt Problems
Faulty or damaged seat belts are a serious safety concern and an instant MOT failure.
How to Avoid Seat Belt-Related MOT Failures
- Check belts for frays, cuts, or damage.
- Make sure the retracting mechanism works smoothly.
- Confirm that all buckles engage and release properly.
Seat belts protect lives, and any defect will cause your car to fail its MOT.
9. Registration Plate and View of the Road
Dirty, broken, or incorrectly displayed number plates can result in a failed MOT. Similarly, anything obstructing the driver’s view of the road, such as stickers, sat-nav placement, or mirror damage, can cause failure.
How to Avoid These MOT Failures
- Keep plates clean and properly illuminated.
- Ensure windscreen and mirrors are unobstructed.
- Remove unnecessary dashboard clutter.
10. General Wear and Tear
From faulty brake lights to a worn exhaust, small issues can add up to a vehicle without a valid MOT certificate. Cars fail every day because of simple neglect.
How to Avoid General MOT Failures
- Follow an MOT checklist and guide before booking your test.
- Consider a full car service or at least an interim check before your MOT is due.
- Address even minor faults early.
Why Choose Ashroad Service Centre for Your MOT Test?
If your MOT due date is approaching, choosing a reliable MOT centre is key to avoiding hassle. Ashroad Service Centre is a trusted name in DVSA-Approved MOT testing, offering thorough inspections and expert advice to help your car pass at the first attempt. Their skilled technicians follow driver and vehicle standards regulations to the letter, ensuring you get an accurate MOT test result.
From pre-test checks to a transparent MOT retest process (if needed), Ashroad service centre ensures your vehicle is safe, compliant, and roadworthy. If you want a stress-free experience and confidence in your MOT certificate, Ashroad Service Centre is a smart choice.
MOT due soon? Book your MOT test in Aldershot today with Ash Road Service Centre and let our specialists handle the rest.
What Happens If You Fail Your MOT?
If your vehicle fails the test, you’ll need to fix the issues before a partial retest or full retest. Driving without an MOT is illegal and can result in fines or even your car being declared a scrap car.
You generally have within 10 working days to get repairs done and return for a retest. Some MOT centres offer free MOT retests if the car is brought back quickly.
Key Takeaways for Passing Your MOT
- Regular car maintenance prevents the most common MOT failures.
- Always check brakes, tyres, suspension, steering, and lights before your test.
- Keep your windscreen and number plates clean for a clear view of the road.
- Fix minor issues early to avoid a failed MOT.
- Use an MOT checker to see your MOT history and your vehicle’s current MOT status.
By staying proactive and informed, you can avoid being part of the majority of failures that are easily preventable. Remember, an annual MOT isn’t just about ticking a legal box; it’s about ensuring your car is safe to drive and protecting everyone on the road.
For trusted local MOT testing and expert advice, visit the Ash Road Service Centre on Google to check customer reviews, hours of operation, and location details before booking your MOT.