7 Common MOT Failure Reasons Every Driver Should Know
For drivers across the UK, the annual MOT test is an unavoidable part of vehicle ownership. Whether you’ve just typed “when is my MOT due?” or searched for “MOT near me”, ensuring your car passes the test is vital for road safety and legal compliance. At Motor Bridge UK, we’ve seen time and again that most failures come down to the same few culprits. In this article, we’ll walk you through the common MOT failure reasons and share practical tips to keep your vehicle in top shape.
Why MOT Tests Matter for UK Drivers
The MOT test isn’t just a box to tick off your to-do list—it’s a legal requirement for vehicles over three years old. A valid MOT certificate shows your car meets safety and environmental standards. Failing to book MOT checks on time can lead to fines, invalidate your insurance, and even result in penalty points. That’s why thousands of drivers search for “book MOT” or “MOT test centre” every month. Staying ahead of your due date means fewer surprises and a smoother driving experience.
7 Common MOT Failure Reasons
Knowing the top reasons cars fail their MOT test allows you to prepare in advance. Here’s a breakdown of the seven most common issues:
1. Tyres
Tyres consistently top the list of common MOT failure reasons. Worn tread, sidewall damage, or under-inflated tyres can all lead to failure. The legal tread depth minimum is 1.6mm, but experts recommend changing tyres once they reach 3mm. Regular checks and maintenance can prevent this simple but frequent problem.
2. Lights and Signals
One of the most frustrating MOT failures happens because of faulty lights. Headlights, brake lights, and indicators must all function correctly. Fortunately, this is one of the easiest problems to fix—often just requiring a quick bulb replacement. Make it a habit to check your lights weekly.
3. Brakes
Brakes are critical to your safety and one of the key reasons cars fail the MOT test. Warning signs include squealing, grinding, or reduced stopping power. If you notice any of these symptoms, book an inspection before your MOT appointment. Properly maintained brakes not only improve your pass rate but also keep you and others safe.
4. Suspension
Suspension issues are harder for drivers to detect without a professional check. Failing suspension is a frequent MOT failure reason, often discovered when mechanics test the car’s stability and shock absorption. If your car feels bouncy, drifts when cornering, or makes knocking noises, it’s worth checking before your MOT.
5. Windscreen and Wipers
A chipped windscreen in the driver’s line of sight or worn-out wipers can result in a failed MOT. Visibility is a priority in road safety, so replace worn blades and repair chips early. Keeping washer fluid topped up is another simple way to avoid this issue.
6. Exhaust and Emissions
Emissions testing is an important part of the MOT, especially with the UK’s push towards cleaner air. A faulty exhaust system, excessive smoke, or failing emissions readings can cause your car to fail. Regular servicing helps keep emissions within legal limits and reduces the risk of expensive repairs.
7. Steering
Faulty steering systems or worn components can also result in MOT failure. Symptoms include difficulty turning the wheel or unusual noises when steering. Regular checks can help you identify issues early and prevent more costly repairs later.
How to Reduce the Risk of MOT Failure
Book MOT tests early – Avoid last-minute rushes that leave you little time to fix problems.
Do a pre-MOT checklist – Inspect tyres, lights, wipers, and fluid levels before visiting the MOT test centre.
Fix advisories quickly – If your last MOT noted advisories, take care of them right away before they develop into failures.
Stay consistent with servicing – Routine maintenance helps catch issues early and extends the lifespan of your vehicle.
Conclusion
Failing your MOT doesn’t just mean inconvenience—it can also mean added costs, delays, and even safety risks. By staying informed about the common MOT failure reasons, you can prepare your car ahead of time, improve your chances of passing, and save money in the long run. Whether you’re booking your test, checking advisories, or searching for “MOT near me”, Motor Bridge UK is here to guide you through every step of the process.
Staying Ahead With Regular Checks
One of the smartest ways to avoid stress on test day is to familiarise yourself with the common MOT failure reasons well before your certificate is due. By regularly monitoring tyres, brakes, lights, suspension, and visibility, drivers can tackle minor issues early and prevent them from becoming costly failures. Proactive maintenance not only boosts your likelihood of passing but also extends your vehicle’s lifespan and keeps you safer on the road.
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