Engine warning light is on
This page is for information only; a mechanic makes the diagnosis.
Likely causes
The engine warning light means the engine control unit has stored a fault code; on its own it does not tell which part has failed. Common causes include the oxygen sensor, ignition coil, spark plug, mass air flow sensor and EGR valve.
Can I keep driving?
If the light is flashing the engine may be misfiring; reduce speed and load and have it checked without delay. If it is steady, the first step is reading the fault code.
Related parts
Tap a part to see listings of that type.
The same symptom can have different causes; have a mechanic look at the vehicle before buying a part and, if possible, get the part code from them.
Frequently asked questions
What are the likely causes of "Engine warning light is on"?
The engine warning light means the engine control unit has stored a fault code; on its own it does not tell which part has failed. Common causes include the oxygen sensor, ignition coil, spark plug, mass air flow sensor and EGR valve.
Can I drive with "Engine warning light is on"?
If the light is flashing the engine may be misfiring; reduce speed and load and have it checked without delay. If it is steady, the first step is reading the fault code.
Which parts should be checked for "Engine warning light is on"?
Common causes include these parts: Oxygen Sensor, Ignition Coil, Spark Plug, Mass Air Flow Sensor, EGR Valve. The mechanic who sees the vehicle decides which one to replace.