The amber engine-shaped light means the engine computer has logged a fault. Steady versus flashing, common causes, what to do and MOT rules.
Looking for more detail? Our full guide covers this topic in depth, with step-by-step advice and sources.
The engine control unit has detected a fault in the engine, emissions or ignition system and stored a fault code.
What it looks like
An engine outline, sometimes with the word CHECK. Colour: Amber.
Common causes
- Faulty oxygen (lambda) sensor
- Loose or worn fuel cap seal
- Ignition coil or spark plug faults (misfires)
- Exhaust gas recirculation (EGR) valve or DPF problems on diesels
- Mass airflow sensor faults
What to do
- If it is steady, drive gently and book a diagnostic check soon.
- If it is flashing, the engine is usually misfiring badly: reduce speed and stop when safe, because unburnt fuel can damage the catalytic converter.
- A garage, or a basic OBD-II code reader, can read the stored code. The code points to the system, not always the exact part.
Can I keep driving?
Usually yes if steady and the car drives normally; no if flashing or the car is losing power.
MOT
An illuminated engine management light is a major fault and an MOT fail.
Symbols vary slightly between makes. Always check your owner's handbook. General guidance only; if in doubt, call your breakdown provider.
Sources and further reading
Facts checked on 20 October 2026. Spotted an error? Tell us and we will correct it.