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Which Warning Lights Fail an MOT?

When it comes to vehicle safety and roadworthiness, the Ministry of Transport (MOT) test plays a crucial role in ensuring that cars meet legal and environmental standards. If your car’s dashboard warning lights are illuminated, it could result in an MOT failure. If you're in the UAE and looking to scrap your car, understanding these warning lights can help you determine if your vehicle is still roadworthy or ready to be scrapped.

Understanding Dashboard Warning Lights

Modern vehicles are equipped with a variety of sensors that alert the driver to potential issues. These warning lights appear on the dashboard and indicate problems ranging from minor maintenance needs to critical system failures. While some lights simply remind you to check your vehicle, others can result in an MOT failure if they remain on during the test.


engine light sign

Key Warning Lights That Can Fail an MOT

Here are the major warning lights that can lead to an MOT failure:

1. Check Engine Light

The check engine light (CEL) is one of the most common dashboard warnings. If this light remains illuminated, it can indicate issues with the engine, exhaust emissions, or even the fuel system. Since excessive emissions can cause a vehicle to fail an MOT, a persistent check engine light can be a serious concern.

2. Airbag Warning Light

The airbag warning light indicates a fault in the Supplemental Restraint System (SRS). Since airbags are crucial for safety, a faulty airbag system means your vehicle fails to meet safety regulations, leading to an MOT failure.

3. Brake Warning Light

Braking performance is essential for road safety. If the brake warning light is on, it could indicate low brake fluid, worn brake pads, or a more serious issue with the braking system. A vehicle with faulty brakes will not pass the MOT test.

4. ABS (Anti-lock Braking System) Warning Light

The ABS prevents wheel lock-up during sudden braking, helping maintain control of the vehicle. If the ABS warning light is illuminated, it signifies a malfunction in the system, which can cause an MOT failure.

5. ESP (Electronic Stability Program) Light

The ESP light relates to the stability control system, which helps prevent skidding and loss of control. A persistent ESP warning light means there could be a fault in the traction control system, which can cause an MOT failure.

6. Power Steering Warning Light

If the power steering warning light is on, it suggests a problem with the steering system. Since effective steering is crucial for safety, this issue can result in an MOT failure.

7. TPMS (Tyre Pressure Monitoring System) Warning Light

In some regions, an illuminated TPMS warning light can lead to an MOT failure. This light indicates that one or more tyres have incorrect pressure, which affects vehicle safety and fuel efficiency.

8. DPF (Diesel Particulate Filter) Warning Light

For diesel cars, a DPF warning light suggests an issue with the emissions system. If the filter is blocked, it can increase harmful exhaust emissions, causing an MOT failure.

9. Battery Warning Light

A battery warning light may indicate problems with the charging system. Since battery and electrical issues can affect essential functions like lighting and ignition, an illuminated battery light can lead to an MOT failure.

10. Coolant Temperature Warning Light

Overheating can cause severe engine damage. If this warning light remains on, it indicates issues with the coolant system, which could lead to an MOT failure due to the risk of engine breakdown.

What to Do If a Warning Light Is On Before an MOT

If your dashboard displays any of these warning lights, it’s important to take action before your MOT test. Here’s what you can do:

  1. Diagnose the Problem – Use an OBD2 scanner to check for error codes related to the warning light.

  2. Fix the Issue – Take your car to a qualified mechanic to repair the underlying problem.

  3. Reset the Light – Once the issue is fixed, ensure the warning light is reset and does not reappear.

  4. Perform a Pre-MOT Check – Conduct a thorough inspection to ensure all dashboard lights are off and the vehicle is in proper condition.

When Should You Scrap Your Car?

If your vehicle fails the MOT due to multiple warning lights and costly repairs, scrapping might be a better option. Here are some signs that indicate it’s time to scrap your car in the UAE:

  • Expensive Repairs – If fixing warning lights and other issues costs more than the car’s value.

  • Frequent Breakdowns – Constant mechanical issues make the car unreliable.

  • High Emissions – Older cars with persistent emission problems may not be worth fixing.

  • Lack of Spare Parts – If replacement parts are difficult to find, scrapping may be the best option.

How to Scrap Your Car in the UAE

If your car is no longer roadworthy, scrapping it is a responsible and hassle-free option. Here’s how you can do it in the UAE:

  1. Contact a Reputable Scrap Dealer – Look for authorized car scrapping services.

  2. Provide Car Details – Share your vehicle’s make, model, and condition for an evaluation.

  3. Get an Offer – Receive a quote based on the vehicle’s scrap value.

  4. Complete Paperwork – Ensure you de-register the car and transfer ownership to avoid liabilities.

  5. Receive Payment – Once the paperwork is done, you’ll receive payment for your scrapped vehicle.

Conclusion

Understanding which warning lights can fail an MOT helps you prepare your car for inspection or decide if it’s time to scrap it. If your vehicle has multiple persistent warning lights and costly repairs, scrapping your car in the UAE could be the best financial decision. Choose a reliable scrap car service to ensure a smooth process and get the best value for your vehicle.


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