The engine failure light is one of the most important lights on your car's dashboard. If it turns on unexpectedly, it can be cause for concern, as it indicates that something is not working properly in the engine or related systems. Below, we explain what to do if this light comes on and the possible causes that could cause it.
What is engine failure light?
The Engine Fault Light, also known as the "Check Engine" or "Engine Warning Light," illuminates when the vehicle's control system detects a problem related to the engine, emissions system, or key components such as sensors. This icon, shaped like an engine, can appear in different ways depending on the severity of the problem: solid for non-critical problems, or red/flashing for serious faults.
Featured Car Deals
What to do if the engine fault light comes on?
Orange or yellow light
If the warning light lights up orange or yellow, it means that there is a non-critical engine fault, but you can still continue driving if the car is behaving normally. However, you shouldn't ignore it. If you notice anything strange about the car's performance (unusual vibrations, strange noises, loss of power), it's best to stop and call a support service.
If everything seems fine, you can continue driving to a workshop, but it is recommended that the car be checked as soon as possible.
Can I try to reset it?
In some cases, if you suspect that the problem is minor, you can try resetting the light by turning off the car, waiting 20-30 seconds and turning it on again. If the light goes out, the problem could have solved itself, but if it comes back on, it is necessary to take the car for service.
Red or flashing light
A red or flashing light is a clear sign that the engine has a serious problem. If it starts, you should immediately stop the car in a safe place, turn off the engine, and never restart it. It is important not to continue driving to avoid causing further damage. In this case, it is best to call a tow truck so that the car can be towed to a specialized workshop.
What does an engine fault light on mean?
An engine fault light not coming on indicates a single problem, but is a general sign that something is wrong with the engine or related systems. It may involve:
- The emissions system (such as the particulate filter or EGR valve).
- The ignition system (worn spark plugs, ignition coils, or preheating systems).
- The fuel system (injectors, pump).
- Problems in the ECU (Engine Control Unit), which can be more complex.
- Exhaust system problems (oxygen sensor, air flow meter).
Top 10 Chinese cars for sale in Spain
Can I drive with the engine fault light on?
Although in some cases you can continue driving with the orange or yellow light on, it is never advisable to ignore this warning. The condition of the engine may worsen if the underlying problem is not fixed in time. If the red light comes on, stop immediately.
What to do if the light goes out on its own?
If the warning light goes out after trying to reset it or after a short drive, continue to drive with caution and visit a workshop for a full diagnosis. The problem may have been temporarily fixed, but it could reappear.
Set up a car in Carwow
How do I reset the engine fault light?
To reset the engine fault light, you can:
- Use a diagnostic tool, which plugs into the car's diagnostic port (usually under the dashboard). This will provide you with an error code and the ability to reset the light.
- If you don't have a code reader, in some cases you can turn off the car, wait 20-30 seconds, and start it again.
- By going to the mechanic, a professional will be able to diagnose and solve more complex problems.
However, never ignore the underlying problem. Even if you can turn off the light, the reason for the failure is still there and can get worse if it is not fixed.
Complete this test and discover your ideal car
Will my car pass the MOT with the engine fault light on?
No, if the engine fault light is on, your car will not pass the MOT. Since 2018, the regulations of the Technical Inspection of Vehicles have been tightened, and any car with the engine fault light on (whether orange, yellow or red) will automatically fail the test. It is essential to solve the problem before taking the car to the ITV.
The 5 Most Common Causes of Engine Fault Light
Here are the five most frequent causes that can activate the engine fault light:
-
Emissions system failure: A common problem in older cars or with a faulty emissions system, such as a damaged oxygen sensor.
-
Diesel Particulate Filter (DPF) Problems: Especially in diesel cars, a clogged DPF or faulty pressure sensor can trigger the light.
-
Mass Air Flow (MAF) Sensor: A faulty sensor prevents the engine from receiving the proper amount of air, affecting performance.
-
Ignition system failure: Problems with spark plugs or ignition coils can cause misfires.
-
Loose fuel tank cap: A poorly closed fuel cap can cause the warning light to come on, although it is one of the easiest solutions to fix.
