Will My Car Fail Its MOT Due to an Engine Warning Light?

The engine warning light (also known as the "check engine" light) is a common issue for many drivers, and it can cause concern when it's illuminated on your dashboard. However, whether or not it will cause your car to fail its MOT depends on the underlying issue and the nature of the warning light itself.

What the MOT Test Checks The MOT test focuses primarily on safety, roadworthiness, and emissions. The test does not specifically check the dashboard warning lights, but it does check for any issues that may trigger those lights. If your car’s engine warning light is on due to a serious issue that impacts the safety or emissions of your vehicle, it can lead to a failure.

For example, if the engine warning light is on because of a malfunctioning exhaust system or an emissions issue that causes your vehicle to exceed legal emissions limits, this would likely result in an MOT failure. However, if the engine warning light is on due to a minor issue, such as a faulty sensor that doesn't affect the vehicle's performance, the MOT might pass the car.

Can an Engine Warning Light Cause an MOT Failure? Yes, the engine warning light can indirectly lead to a failed MOT if it is related to an issue that impacts key components such as the engine, emissions, or exhaust system. If the MOT tester detects any of these issues, your car will fail the test. For example, if the engine light is on due to a faulty catalytic converter or a problem with the vehicle’s fuel system, these will be noted during the emissions test and could lead to a failure.

How to Prepare for the MOT If you’re concerned about the engine warning light on your dashboard, it’s a good idea to have the issue diagnosed and repaired before going for your MOT test. You can take your car to a mechanic or use diagnostic tools to read the error codes, which will help identify the issue. For instance, using a Car BHP Checkcan help you assess engine performance and any underlying problems.

Additionally, you can check the vehicle’s full MOT history, including any previous issues or advisories, on our MOT Check page.

Conclusion An engine warning light may cause your car to fail its MOT if it’s due to a serious issue that affects the car’s safety or emissions. To avoid failing your MOT, it’s important to diagnose and repair any issues indicated by the warning light before going for the test. You can track your car’s MOT status and history through our MOT Check tool.