Engine Warning Light Meaning UK
The engine warning light (also called the check engine light or MIL) means the engine management system has detected a fault and stored a diagnostic code. A steady light with no other symptoms is generally safe for a short drive to a garage; a flashing light means a serious misfire and you should stop safely as soon as possible.
Common causes
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Common questions about: Engine Warning Light Meaning UK
Is it safe to drive with the engine warning light on?
It depends on whether other warning lights are also on, whether the car is driving normally, and whether the light is steady or flashing. A flashing engine light usually means a serious misfire and you should stop safely. A steady light with no other symptoms is generally safe for a short drive to a garage.
What are the most common causes of an engine warning light?
The most common causes are a faulty oxygen sensor, a loose or damaged fuel cap, a failing catalytic converter, spark plug or ignition coil issues, or a mass airflow sensor fault. A diagnostic scan (OBD reader) is needed to identify the exact fault code.
How much does it cost to diagnose an engine warning light?
Most UK independent garages charge £40–£80 for a diagnostic scan. Some may apply the fee to any subsequent repair. Dealerships typically charge more, between £80–£150.
Can I reset the engine warning light myself?
You can clear the code with an OBD reader, but this only hides the symptom — it does not fix the underlying fault. The light will return if the root cause is not repaired.
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