Check oil level.
Check that the electrical wires are connected to the sensor correctly.
Checking the oil pressure sensor 0.3 bar
Unscrew oil pressure switch 1.8 bar (white insulation) on top of the oil filter flange. On a diesel, unscrew the sensor 1.4 bar, with a turbodiesel 0.9 bar (gray insulation).
Screw in a pressure gauge instead of the sensor.
If a VAG measuring device is used, screw the pressure sensor into the device.
Disconnect the electrical wire from the pressure sensor 0.3 bar (brown insulation) at the bottom of the filter flange. Connect the sensor with the measuring voltage to the positive pole of the battery. In this case, the device should show voltage. The control lamp should light up.
Start the engine and slowly raise its speed.
As soon as the pressure gauge shows 0.15-0.45 bar, the device should no longer show voltage, the control lamp should go out. Otherwise, replace the sensor.
Attention: If necessary, check the moment when the pressure sensor is switched on at the engine start speed.
Checking oil pressure sensors 1.8 / 1.4 / 0.9 bar
Attention. The test described can only be carried out if the sensor can be screwed into the measuring device.
Connect measuring device with wire -3- to ground.
Connect the plug on the wire sensor -1- and the voltage meter -2- to the positive pole of the battery. When the engine is on, there should be no voltage on the device. Otherwise, replace the sensor.
Start the engine and slowly raise the speed.
When the control pressure is reached, the device should show voltage, and the lamp should light up.
Oil pressure check
Start the engine. Raise the number of revolutions to 2000 rpm. At an oil temperature of +80°C, the oil pressure at a given speed must be at least 2.0 bar.
Low oil pressure indicates worn crankshaft bearings.
Insert pressure sensor with O-ring and tighten to 25 Nm.
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