Sequence of works
The oil level indicator light comes on when the oil level is normal and the engine is running:
1. Remove the oil level sensor connector.
2. Use an ohmmeter to check the contact between the sensor and ground.
[Material taken from a web resource www.MercedesMan.ru]
3. If there is no contact, remove and replace the sensor. If there is contact on the sensor, check the wiring from the sensor to the instrument panel.
4. If all the wiring is in order, then the cause of the problem may be a defect in the instrument panel.
The indicator lamp does not light when the ignition is turned on: The lamp may be burnt out. Replace it.
The indicator lamp does not light when the engine is running, the oil temperature is above 60°C and the oil level is below the minimum mark:
1. Disconnect the wire from the sensor.
2. Check the contact between the sensor connector and the ground. The circuit may be open.
3. If the lamp does not light, despite the fact that the contact on the sensor is broken, then the lamp has burned out.
4. If there is no contact on the sensor, remove, check and replace the sensor if necessary.