The Most Common MOT Failures: Ensuring your vehicle passes its MOT test is crucial for both legal compliance and road safety in the UK. Understanding the most common reasons for MOT failures can help you take proactive measures to keep your car in top condition and avoid unexpected repair costs. This article provides an in-depth guide on the most frequent MOT failures, prevention tips, and additional maintenance advice to help you sail through your next test.
The Most Common MOT Failures
Understanding the most common MOT failures and taking preventive measures can save you time, money, and stress. Regular maintenance, thorough inspections, and prompt repairs will help your vehicle pass the MOT with flying colours. For more information on MOT requirements and to find an approved test centre, visit the GOV.UK MOT page.
| Common MOT Failure | Percentage of Failures | Prevention Tips |
|---|---|---|
| Lighting and Signalling Issues | 18.9% | Regularly check all lights, including headlights, indicators, brake lights, and number plate lights. Replace any faulty bulbs promptly. |
| Suspension Problems | 13% | Be attentive to unusual noises or changes in handling. Have your suspension system inspected regularly, especially after driving on rough roads. |
| Brake System Defects | 10% | Listen for squealing or grinding noises and ensure the vehicle stops smoothly. Regular maintenance and prompt attention to warning signs are essential. |
| Tyre Issues | 7.7% | Check tyre tread depth (minimum 1.6mm), ensure proper inflation, and inspect for damage. Replace tyres as needed. |
| Driver’s View Obstructions | 7.2% | Keep the windscreen clean, repair chips or cracks promptly, and ensure wipers are functional. Remove any dashboard obstructions. |
Source: RAC – Most Common MOT Failures
The Most Common MOT Failures – And How to Prevent Them
1. Lighting and Signalling Issues
Lighting and signalling defects are the leading cause of MOT failures, accounting for 18.9% of all cases. These issues often involve simple problems like blown bulbs or faulty indicators.
Prevention Tips:
- Regular Inspections: Periodically check all exterior lights, including headlights, tail lights, indicators, brake lights, and number plate lights.
- Prompt Replacements: Replace any non-functional bulbs immediately.
- Clean Lenses: Ensure all light covers are clean and free from cracks.
2. Suspension Problems
Suspension issues contribute to 13% of MOT failures. Components like shock absorbers, springs, and linkages can wear out, especially when frequently driving on uneven or pothole-ridden roads.
Prevention Tips:
- Monitor Vehicle Handling: Be alert to changes in ride comfort or handling, such as excessive bouncing or pulling to one side.
- Listen for Unusual Noises: Clunking or knocking sounds when driving over bumps may indicate suspension problems.
- Regular Professional Checks: Have a mechanic inspect your suspension system during routine maintenance, particularly if you notice any warning signs.
3. Brake System Defects
Braking system defects account for 10% of MOT failures. Given the critical role brakes play in vehicle safety, maintaining them is essential.
Prevention Tips:
- Listen for Warning Sounds: Squealing or grinding noises can indicate worn brake pads or discs.
- Assess Braking Performance: If the car pulls to one side or the brakes feel less responsive, seek immediate inspection.
- Check Brake Fluid Levels: Ensure brake fluid is at the recommended level and free from contamination.
4. Tyre Issues
Tyre-related problems cause 7.7% of MOT failures. Tyres are the only contact point between your vehicle and the road, making their condition vital.
Prevention Tips:
- Tread Depth: Legally, tyres must have a minimum tread depth of 1.6mm. Use a tread depth gauge or the 20p coin test to check.
- Proper Inflation: Maintain tyre pressure at manufacturer-recommended levels to ensure optimal performance and longevity.
- Inspect for Damage: Look for cuts, bulges, or foreign objects embedded in the tyre.
5. Driver’s View Obstructions
Obstructions affecting the driver’s view account for 7.2% of MOT failures. A clear line of sight is essential for safe driving.
Prevention Tips:
- Windscreen Maintenance: Regularly clean the windscreen inside and out. Repair any chips or cracks promptly to prevent them from expanding.
- Functional Wipers: Ensure wiper blades are in good condition and replace them if they leave streaks or fail to clear the screen effectively.
- Remove Obstructions: Keep the dashboard and windscreen free from items like air fresheners, sat-nav mounts, or stickers that could impede your view.
Additional Tips for Passing Your MOT
- Regular Maintenance: Adhere to your vehicle’s service schedule to keep all systems in optimal condition.
- Pre-MOT Checklist: Conduct a thorough check of common failure points before the test.
- Address Warning Lights: Any illuminated warning light on the dashboard will result in an MOT failure. Have these diagnosed and resolved promptly.
- Keep It Clean: Ensure your vehicle is clean inside and out, including the registration plates, which must be clearly visible.
MOT Check: Everything You Need to Know to Stay Road Legal
Frequently Asked Questions (FAQs)
1. What is an MOT test?
An MOT test is an annual inspection required for vehicles over three years old in the UK to ensure they meet road safety and environmental standards.
2. Can I drive without an MOT certificate?
No, driving without a valid MOT certificate is illegal, and you could face fines up to £1,000.
3. What happens if my car fails the MOT?
If your car fails the MOT, you will receive a VT30 refusal certificate. You must repair the faults before retesting.
4. Can I appeal a failed MOT test?
Yes, you can appeal a failed MOT test by contacting the Driver and Vehicle Standards Agency (DVSA) within 14 days.
