If you own a car in the UK, passing the MOT test is essential to keep your vehicle legally on the road. Every year, thousands of vehicles fail their MOT due to issues that could have been easily fixed beforehand.
At Brunswick MOT Centre, technicians regularly see vehicles fail for common problems such as worn tyres, faulty lights, and brake issues. Understanding these common reasons can help you prepare your vehicle and improve your chances of passing the test.
Here are the top 10 reasons cars fail an MOT test.
1. Faulty Lights and Indicators
One of the most frequent reasons for MOT failure is defective lighting.
Common lighting issues include:
- Blown headlight bulbs
- Brake lights not working
- Faulty indicators
- Broken number plate lights
These problems are usually simple and inexpensive to fix, so it’s always a good idea to check all lights before your MOT appointment.
2. Worn or Damaged Tyres
Tyres play a critical role in vehicle safety. In the UK, the legal minimum tread depth is 1.6mm across the central three-quarters of the tyre.
Cars may fail their MOT if:
- Tyres are worn below the legal limit
- Tyres have cuts or bulges
- Uneven tyre wear is present
Checking your tyres before the test can help prevent an unnecessary failure.
3. Brake Problems
Brakes are one of the most important safety systems in any vehicle.
Your car may fail the MOT if:
- Brake pads are worn out
- Brake discs are damaged
- The braking system is inefficient
If you notice squeaking or grinding sounds when braking, it’s best to have them inspected before the test.
4. Suspension Issues
The suspension system helps keep your vehicle stable and comfortable while driving.
Common suspension problems include:
- Worn shock absorbers
- Broken springs
- Loose suspension components
These issues can affect vehicle handling and safety.
5. Poor Visibility
Visibility is another important part of the MOT inspection.
Your vehicle may fail if there are problems with:
- Windscreen damage in the driver’s view
- Faulty windscreen wipers
- Empty windscreen washer bottle
These are simple issues that can easily be checked before the test.
6. Steering Problems
Steering faults can make driving dangerous and are taken seriously during MOT inspections.
Examples include:
- Excessive steering wheel play
- Power steering faults
- Damaged steering components
If your steering feels unusual or unstable, it should be checked immediately.
7. Exhaust and Emissions Issues
Vehicles must meet environmental standards to pass the MOT.
Common emission-related failures include:
- Excessive exhaust smoke
- Faulty catalytic converter
- Engine running too rich or too lean
Regular servicing can help maintain proper engine performance and emissions levels.
8. Seat Belt Faults
Seat belts are essential safety equipment.
Your car may fail the MOT if:
- Seat belts are damaged or frayed
- Buckles do not lock properly
- Seat belts do not retract correctly
These issues must be fixed to ensure passenger safety.
9. Number Plate Problems
Number plates must be clearly visible and meet legal standards.
Your vehicle may fail if:
- Number plates are cracked or damaged
- Characters are not clearly readable
- Plates are incorrectly spaced
Keeping your number plates clean and in good condition can help avoid this issue.
10. Vehicle Structure and Body Condition
Serious corrosion or structural damage can cause an MOT failure.
Inspectors check areas such as:
- Vehicle frame
- Door structures
- Mounting points for suspension and seat belts
If corrosion affects safety components, repairs will be required before the vehicle can pass.
Prepare Your Car for a Successful MOT
Many MOT failures occur due to minor issues that drivers overlook. Performing basic checks before your test can greatly increase the chances of passing on the first attempt.
Professional garages like Brunswick MOT Centre provide expert inspections and servicing to help ensure your vehicle meets all safety and legal requirements.
Regular maintenance not only improves your chances of passing the MOT but also keeps your vehicle running safely and efficiently.