Mercedes-Benz W140 oil pressure gauge reading
400 SES 420
What is the normal oil pressure gauge reading of the W140 at idle?
About 1 bar at hot idle is a normal reading. As revs rise, the pressure must rise. If the reading drops to zero when you accelerate, the sensor is a common source of the fault.
Why does the W140 oil pressure gauge show zero even though the sensor is new?
The sensor connector has two holes, and the plug may be in the wrong hole. Then the gauge shows zero even if the sensor has been replaced. Move the plug to the correct hole and check the reading again.
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