Understanding which warning lights can lead to an MOT failure is crucial for vehicle owners. The MOT test assesses the safety and roadworthiness of vehicles, and certain dashboard warning lights indicate serious issues that must be addressed before the test.

Overview of Warning Lights

When preparing for an MOT, it’s essential to be aware of the two categories of warning lights: red and amber. Red lights typically indicate critical faults that require immediate attention, while amber lights signal less urgent issues but still warrant prompt action.

Red Warning Lights

Red warning lights are serious indicators that your vehicle may not be safe to drive. If any of these lights are illuminated during your MOT, your vehicle will automatically fail:

  • Engine Management Light (EML): Indicates potential engine or emissions system faults.
  • ABS (Anti-lock Braking System) Light: Signals a malfunction in the braking system, critical for vehicle safety.
  • Airbag Warning Light: Suggests a fault in the airbag system, affecting passenger safety.
  • Brake Fluid Level Light: Indicates low brake fluid levels, which can compromise braking effectiveness.

Amber Warning Lights

While amber lights are not always an automatic fail, they should not be ignored. If these lights are illuminated during an MOT, they may contribute to a failure if they indicate a malfunctioning component:

  • Coolant Temperature Warning: Indicates overheating; while not an automatic fail, it needs immediate attention to prevent engine damage.
  • Power Steering Light: A malfunction here can affect steering control but may not guarantee a fail unless it impacts safety systems.
  • Tyre Pressure Monitoring System (TPMS): An inoperative TPMS can lead to a fail if it indicates low tyre pressure.

Common Causes of MOT Failures Related to Warning Lights

In addition to dashboard warnings, various vehicle components can lead to MOT failures:

  • Lighting Issues: Faulty bulbs account for nearly 30% of all MOT failures. Ensure all headlights, taillights, and indicators are functioning correctly.

  • Tyre Conditions: Worn or damaged tyres can lead to a fail. Check tread depth and look for any visible damage.

  • Suspension Problems: Noises or fluid leaks from suspension components can result in failure. Regular inspections can help identify these issues early.

Importance of Pre-MOT Checks

Conducting thorough pre-MOT checks on your vehicle is vital. Here are some key areas to inspect:

  • Check all warning lights and ensure they are off before the test.

  • Inspect all external lights for functionality.

  • Examine tyres for tread depth and damage.

By addressing these issues before your MOT, you can significantly increase your chances of passing the test without complications.

FAQs About Warning Lights and MOT Failures

    • What happens if my car has a warning light on during the MOT?
      If any critical red warning light is illuminated, your car will automatically fail the MOT.
    • Can I still pass my MOT with an amber warning light?
      It depends on the specific issue; however, addressing any amber warnings is advisable.
    • How can I prepare my car for an MOT?
      Conduct a thorough inspection of all lights, tyres, and check for any dashboard warning lights prior to the test.