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The dreaded Engine Management Light (EML) popping up on your dashboard can send shivers down any driver’s spine. Not only does it indicate a potential issue with your vehicle, but it also raises the question: Does an Engine Management Light (EML) fail an MOT? Understanding the implications of this warning light and how it impacts your MOT test is essential for avoiding unexpected costs or complications.

What Is the Engine Management Light (EML)?

The Engine Management Light is part of your car’s onboard diagnostics system. When it illuminates, it’s alerting you to a potential problem with the engine or its related systems. The severity of the issue can range from a minor fault to something more serious that needs immediate attention.

The light may appear as:

• Steady: This typically indicates a less urgent issue that should still be checked soon.
• Flashing: This often signals a more severe problem, such as a misfire, which requires immediate action to avoid further damage.

The EML and Your MOT

When it comes to the MOT test, the Engine Management Light (EML) plays a crucial role in determining whether your car passes or fails.

Since 2018, the MOT test in the UK has included stricter guidelines regarding dashboard warning lights. If the EML is illuminated during the test, the vehicle will automatically fail. This is because the light indicates that there may be an issue affecting the car’s emissions, safety, or performance.

Common Reasons for an EML Warning

Understanding why the EML is on can help you address the issue before your MOT. Common causes include:

1. Faulty Oxygen Sensor
   A malfunctioning oxygen sensor can cause the EML to light up. This sensor monitors the level of oxygen in your car’s exhaust, ensuring the engine runs efficiently.
2. Loose Fuel Cap
   A loose or damaged fuel cap can cause a minor air leak in the fuel system, triggering the EML.
3. Catalytic Converter Issues
   Problems with the catalytic converter can impact emissions and lead to an EML warning.
4. Faulty Spark Plugs or Ignition Coils
   A misfire caused by faulty spark plugs or ignition coils can also trigger the EML.
5. Mass Airflow Sensor Faults
   This sensor monitors the air entering the engine and adjusts fuel levels accordingly. A fault here can affect performance and emissions.

What to Do If Your EML Is On

If your EML is illuminated, here’s what you should do:

1. Don’t Ignore It
   Ignoring the EML could lead to more serious and costly damage to your vehicle.
2. Check for Simple Fixes
   Start by checking simple issues, such as a loose fuel cap, before consulting a mechanic.
3. Use a Diagnostic Tool
   Many modern diagnostic tools can read fault codes from your car’s onboard system. This can help identify the exact issue causing the EML to light up.
4. Get Repairs Done Before Your MOT
   If your EML is on, it’s likely your car will fail its MOT. Book a repair with a trusted garage to resolve the issue before taking the test.

How Rooster Can Help

Rooster is here to make car maintenance easier and more affordable. With our MOT and repair predictor, you can get insights into potential issues, including whether the EML might cause your car to fail its MOT. Rooster also helps you find affordable garages and repair services, saving you time and money.

Final Thoughts

So, does an Engine Management Light (EML) fail an MOT? Yes, it can. If your EML is illuminated during the test, your car will fail. However, by addressing the issue early and using tools like Rooster, you can resolve the problem and ensure your vehicle passes with flying colours.