Most MOT failures result from gradual wear rather than sudden mechanical faults. Knowing the signs your car will fail its MOT gives you the chance to fix minor defects before they become expensive repairs or leave you without a valid MOT certificate.
MOT tests follow inspection standards set by the Driver and Vehicle Standards Agency (DVSA). A few simple checks before your appointment can improve your chances of passing first time. If you’re due to book an MOT test in Bromley, arranging it early also leaves time for any necessary repairs. If you have any questions our team can help – call 020 8460 6666.
A quick visual inspection a few weeks before your MOT often identifies simple faults that can be repaired before they become a reason for failure.
What Are the Most Common Signs Your Car Will Fail MOT?
Many MOT failure signs become noticeable during everyday driving. Paying attention to changes in how your vehicle looks, sounds or feels can help you identify issues before your test. The following checks cover some of the most common MOT failures UK garages identify.
Tyres Are Worn or Damaged
Tyres are one of the most common MOT failure reasons. UK law requires at least 1.6mm of tread across the central three-quarters of the tyre. Uneven wear, cuts, bulges or exposed cords may also result in a failure. If you notice visible damage or reduced grip, have your tyres inspected before your MOT.
Brake Problems Are Becoming More Noticeable
Grinding noises, vibrations through the pedal or the car pulling to one side while braking may indicate worn brake components. A professional inspection can confirm whether repairs are needed before your MOT.
Dashboard Warning Lights Stay On
Modern vehicles continuously monitor many critical systems electronically. An illuminated engine management, ABS, electronic stability control or airbag warning light may affect your MOT result. If a warning light appears, don’t ignore it. Reading the fault codes early can help identify the underlying problem. Our guide on understanding vehicle warning lights explains what common dashboard symbols mean.
Exterior Problems That Can Cause an MOT Failure
The MOT includes several checks on your vehicle’s exterior to ensure it remains safe for you and other road users.
Lights Are Not Working Properly
Check headlights, brake lights, indicators, reversing lights, rear fog lights and number plate lights before your appointment. Also ensure lenses are secure and not badly cracked.
Windscreen Wipers and Washers Are Ineffective
Split wiper blades, ineffective washers or a damaged windscreen that obstructs the driver’s view may all affect your MOT. If your wipers leave streaks, replace them before the test. Chips and cracks on the windscreen are another common reason for MOT failures.
Number Plates or Mirrors Are Damaged
Registration plates must be clearly readable and securely attached. Damaged mirrors or incorrectly displayed number plates should be repaired before your test.
Can Suspension or Steering Problems Lead to an MOT Failure?
Yes. Suspension and steering components experience constant wear, especially on vehicles driven regularly over uneven roads or speed bumps. Warning signs include:
- Knocking sounds over bumps
- Excessive bouncing after driving over potholes
- Uneven tyre wear
- Steering that feels unusually heavy or loose
- The vehicle pulling to one side
These symptoms do not necessarily mean your car will fail its MOT, but they should be checked promptly. Regular servicing can identify worn components before your test.
Will Emissions Problems Cause an MOT Failure?
Vehicles must meet emissions standards appropriate for their age and fuel type. Warning signs include excessive exhaust smoke, rough idling, poor fuel economy or an illuminated engine management light. Keeping your vehicle serviced helps reduce the risk of emissions-related failures.
How Can You Improve Your Chances of Passing First Time?
Many drivers search for ways to pass an MOT first time, and the good news is that preparation makes a real difference. Here’s a simple MOT checklist that UK motorists can follow:
- Check all lights are working.
- Inspect tyre tread and pressures.
- Top up screen wash.
- Replace worn wiper blades.
- Ensure the horn works.
- Remove anything obstructing the driver’s view.
- Check seatbelts fasten and retract correctly.
- Look for any obvious fluid leaks beneath the vehicle.
These basic checks only take a few minutes but can prevent avoidable failures. For more preparation advice, take a look at our guide on top tips to help ensure your car passes MOT first time, which explains additional checks worth carrying out before your appointment.
Does Regular Servicing Reduce the Risk of MOT Failure?
Servicing and MOT testing have different purposes but work well together. A service identifies wear before it becomes a safety issue, while an MOT checks whether your vehicle meets the minimum legal roadworthiness standards.
Regular maintenance can reduce the likelihood of unexpected defects. If you’d like to understand other issues that frequently lead to failures, our guide covering the common reasons for MOT failures and how to avoid them offers further practical advice.
Spot Problems Early and Make Your MOT Less Stressful
Recognising the signs your car will fail MOT doesn’t require advanced mechanical knowledge. Listening for unusual noises, watching for dashboard warning lights and carrying out a few simple visual checks can highlight many problems before your test date.
Preparing your vehicle in advance may help you avoid unnecessary inconvenience and reduce the chance of unexpected repair costs. If your MOT is approaching or you’ve noticed any of the warning signs above, contact Bromley Vehicle Test Centre to arrange an inspection or book your MOT.
Frequently Asked Questions
Can I drive my car if I think it will fail its MOT?
If your current MOT certificate is still valid and the vehicle remains roadworthy, you can usually continue driving until the test date. However, any dangerous defects should be repaired immediately, regardless of the MOT expiry date.
What is the most common reason cars fail an MOT?
Tyres, lighting, brakes and suspension components regularly appear among the most common MOT failures UK testing stations identify. Many of these issues develop gradually and can be found during routine maintenance.
Should I service my car before its MOT?
A service is not mandatory before an MOT, but it can identify worn or damaged parts that may otherwise result in a failure. Many motorists choose to service their vehicle shortly before the test for this reason.
Will an engine management light fail an MOT?
An illuminated engine management light may cause an MOT failure if it indicates a fault affecting emissions or another system covered during the inspection. Having the fault diagnosed before your MOT helps identify the cause and determine whether repairs are needed.
How early can I book my MOT?
You can usually book your MOT up to one month, minus one day, before your current certificate expires while preserving your renewal date, provided the vehicle passes.