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Robert, UK Qualified Car Technician
Category: Mercedes
Satisfied Customers: 4708
Experience:  Fully qualified / self employed garage technician in the UK
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engine diagnostic warning lamp is on. what does this mean and

Customer Question

engine diagnostic warning lamp is on. what does this mean and what should I do.
Submitted: 3 years ago.
Category: Mercedes
Expert:  Robert replied 3 years ago.


Hopefully i can help..

Normally when the engine warning light comes up - Its means the cars ecu has detected a fault with one of the engine sensor/wiring or ecu controlled component on the engine,sometimes this can put the car in limp home mode depending on the nature of the fault the ecu is seeing..ideally the next stage is to get the car scanned for fault codes which there should be seeing the engine light is on - once you know what these faults car then can you take steps to make checks or investigate further based on the result before replacing anything..any good well equiped garage or mobile tech should be able to carry that out for you..I do hope this helps

Expert:  Robert replied 3 years ago.