I have a Mercedez 300 SDL 1987 oil light is on and I check oil quantity and is OK the gaeg Pressure is on 3 Always when I turn on the Engine Could it be the sensor? If some body had experience this before I will be happy with your comments.

Fernnado Q

The sensor is a simple switch that is grounded when the level is proper. Unplugging it will cause the light to come on. Jumping the connector to ground should turn the light off.

Because it would be unsettling to see the light come on and off when cornering or braking hard, the signal is dampened in the gauge. I forget the strategy but it won't come right on. It could take 20 seconds or so.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Thanks steve but this means that the sensor could be damage. What about that the pressure gage indicater is always on 3??

Thanks
Fernando Q

Is it on 3 when the motor is off? When the motor is off but key is on?

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Thanks Steve I will explain

When the Motor is Off Gage is OFF
When I turn ON the Ignition KEY then THe gage Reads 3 And when I start the Engine it will continue on 3 and the Oil Light ON Always

When I turn OFf Everything Turn OFF

So your gauge is not working either. That is more important than the light. It is likely the sending unit.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

thansk steve SO I think I have to order one from Diesel Giant or You have Another Place?

another Question; These means that these sending units measure Oil And pressure??

One measures pressure, another detects level (or lack of).

Fastlane sells them too, btw.

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D

Thanks to all of you guys