Common MOT Failures and How to Avoid Them

Common MOT Failures and How to Avoid Them

A comprehensive guide from Carlingo Harrogate to help keep your vehicle roadworthy

Every year, millions of vehicles in the UK undergo the mandatory MOT test, and approximately one-third fail on their first attempt. At Carlingo Harrogate, we understand that MOT failures can be frustrating, inconvenient, and potentially costly. This guide highlights the most common reasons vehicles fail their MOT tests and provides practical advice on how to avoid these issues.

 

Lighting and Signalling

Faulty lights account for nearly 30% of all MOT failures, making them the most common issue. Problems typically include:

  • Blown bulbs in headlights, brake lights, or indicators
  • Misaligned headlights
  • Cracked light covers
  • Faulty electrical connections

Prevention Tips:

  • Check all exterior lights monthly by walking around your vehicle while lights are on
  • Have someone help verify your brake lights are functioning
  • Replace any blown bulbs immediately
  • Clean light covers regularly to maintain visibility
  • Consider keeping spare bulbs in your vehicle for quick replacements

 

Suspension and Steering

Suspension and steering problems account for approximately 20% of MOT failures. Common issues include:

  • Worn shock absorbers
  • Damaged suspension springs
  • Loose steering components
  • Excessive play in steering wheel
  • Ball joint issues

Prevention Tips:

  • Pay attention to unusual noises when driving over bumps
  • Notice if your car "bounces" excessively after hitting a bump
  • Check for uneven tyre wear, which often indicates suspension problems
  • Be alert for steering pull to one side or vibrations in the steering wheel
  • Have your suspension inspected annually, especially if you frequently drive on rough roads

 

Brakes

Brake issues cause around 17% of MOT failures and present serious safety concerns. Common problems include:

  • Worn brake pads or discs
  • Uneven braking
  • Brake fluid leaks
  • Imbalanced braking forces
  • Handbrake ineffectiveness

Prevention Tips:

  • Listen for grinding or squealing noises when braking
  • Have brake pads checked regularly – most manufacturers recommend inspection every 12,000 miles
  • Pay attention to the brake pedal feel – if it feels spongy or requires more pressure than usual, seek professional advice
  • Ensure brake fluid is topped up and changed according to manufacturer guidelines
  • Test your handbrake on a slope occasionally to ensure it holds effectively

 

Tyres and Wheels

Tyre-related failures account for approximately 10% of MOT rejections. The legal minimum tread depth in the UK is 1.6mm across the central three-quarters of the tyre. Issues typically include:

  • Insufficient tread depth
  • Uneven wear patterns
  • Bulges or cuts in tyre sidewalls
  • Incorrect tyre size for the vehicle
  • Mismatched tyres on the same axle

Prevention Tips:

  • Check tyre pressure monthly and before long journeys
  • Inspect tread depth regularly using the 20p coin test (the outer band should be hidden when inserted into the tread)
  • Rotate tyres according to manufacturer recommendations
  • Look for foreign objects embedded in tyres
  • Check wheel alignment if you notice uneven wear patterns

 

Visibility Issues

Problems affecting driver visibility cause about 8% of MOT failures. These include:

  • Damaged windscreen (cracks or chips)
  • Faulty wipers
  • Empty or ineffective screen wash
  • Damaged or missing mirrors
  • Obstructions to the driver's view

Prevention Tips:

  • Address chips promptly before they develop into cracks
  • Replace wiper blades every 6-12 months
  • Keep screen wash topped up with proper solution, not just water
  • Ensure all mirrors are secure and adjustable
  • Remove items that obstruct visibility from the windscreen and windows

 

Exhaust and Emissions

Emissions failures account for approximately 7% of MOT rejections, with standards becoming increasingly stringent. Issues include:

  • Excessive carbon monoxide or hydrocarbon emissions
  • Damaged exhaust system components
  • Diesel particulate filter (DPF) problems
  • Exhaust leaks
  • Warning lights related to emissions systems

Prevention Tips:

  • Ensure regular servicing to maintain optimal engine performance
  • Use quality fuel from reputable stations
  • Address any engine warning lights promptly
  • Take regular longer journeys if you have a diesel vehicle with DPF to allow regeneration
  • Listen for changes in exhaust noise that might indicate leaks

 

Body, Structure and General Items

Structural and body issues account for around 6% of MOT failures. These include:

  • Excessive corrosion, especially in load-bearing areas
  • Damaged or loose bumpers
  • Sharp edges that could cause injury
  • Insecure seats or seatbelts
  • Boot or bonnet that doesn't close securely

Prevention Tips:

  • Regularly wash your car, particularly during winter to remove road salt
  • Address minor rust spots before they worsen
  • Check that all doors, bonnet and boot close securely
  • Ensure seats and seatbelts are firmly anchored
  • Repair any body damage promptly, even if it seems cosmetic

 

Fuel and Electrical Systems

Issues with fuel and electrical systems cause approximately 5% of MOT failures. Problems include:

  • Fuel leaks
  • Insecure fuel cap
  • Battery security
  • Electrical wiring issues
  • Dashboard warning lights

Prevention Tips:

  • Check underneath your vehicle occasionally for signs of fuel or oil leaks
  • Ensure your fuel cap seals properly and clicks when tightened
  • Make sure the battery is securely mounted
  • Address dashboard warning lights promptly rather than ignoring them
  • Have electrical issues diagnosed by professionals rather than attempting DIY fixes

 

 

At Carlingo Harrogate, We're Here to Help

We understand that maintaining your vehicle can sometimes feel overwhelming. That's why our team of experienced technicians offers pre-MOT inspections to help identify potential issues before your official test. This proactive approach can save you time, money, and inconvenience.

Remember that regular maintenance throughout the year is more effective than last-minute preparations. Many MOT failures could be avoided with proper routine care and attention to warning signs.

If you're concerned about your vehicle's condition or have questions about preparing for an upcoming MOT, our friendly team at Carlingo Harrogate is always ready to offer expert advice tailored to your specific vehicle.

By staying vigilant and addressing small issues before they become significant problems, you can help ensure your vehicle remains safe, legal, and reliable on the road.

Visit Carlingo Harrogate today for comprehensive vehicle checks and expert advice on keeping your car in prime condition year-round.