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Difference between engine control warning light and engine maintenance warning light

Model: (Various brands) Various
Part: Warning light – error code

Video tutorial

In this video we see what the difference is between the engine warning light and the maintenance light. The engine warning light is yellow/amber and indicates a fault or malfunction detected by the ECU: it is a warning of a technical problem related to the catalytic converter, oxygen sensor, valve timing, injectors etc; all problems that need to be urgently checked by a mechanic and that only turn off after the fault has been repaired.

The maintenance light, on the other hand, is often a wrench with the word service written on it: it is a programmed reminder that indicates it is time for maintenance; it does not detect faults, but only tells us that it is time for a service. It is manually reset after the required services have been performed.


Posted on 29 August 2025 by ScegliAuto


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How to Set the Time in an Audi A4?

In this tutorial, you will see how to set the time in an Audi A4, a very simple and quick operation to perform after replacing the battery or when the time changes. First, insert the key and turn on the instrument cluster. Then, press the "SETUP" button located on the center console. Next, press the upper left arrow button, navigate to the "Time" option, and use the central knob to adjust the clock. Finally, set any necessary formats and save by returning to the main screen.

Watch the video!


by ScegliAuto

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