Oil Pressure Sender: Testing and Inspection

Oil pressure and oil pressure switch, checking





Special Tools and Equipment
^ VAG1342 oil pressure gauge
^ VAG1527B
^ VAG1594A

Test requirements:
^ Oil level OK
^ Engine oil temperature approximately 80°C.
^ With ignition on, Oil Pressure Warning Light-K3 must be lit.
^ For vehicles with Auto Check System, "OK" indicator must be lit (call up symbol).





Oil pressure switch, checking
- For vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of parking heater/auxiliary heater at noise insulation.





- Loosen mounting parts -1 to 4- and remove noise insulation.





- Disconnect electrical harness connector from oil pressure switch (arrow).





- Unscrew oil pressure switch and install VAG1342 oil pressure tester.
- Thread oil pressure switch -2- into VAG1342 oil pressure tester.
- Connect brown wire -1- of tester to Ground (GND).
- Using VAG1594A connect test kit, connect VAG1527B voltage tester to oil pressure switch and Battery (+).
^ LED must not be lit.
- If LED is lit, replace oil pressure switch.
- Start engine.

Note: While starting engine, watch Pressure Tester and LED as oil pressure switch may open during start.

Black oil pressure switch:
^ T 1.2 to 1.6 bar pressure, LED must light up.

- If LED does not light up, replace oil pressure switch.

Oil pressure, checking
- Disconnect electrical wire from oil pressure switch.





- Unscrew oil pressure switch and install VAG1342 oil pressure tester.
- Thread oil pressure switch -2- into VAG1342 oil pressure tester.
- Start engine (engine oil temperature approximately 80°C).
^ Oil pressure at idle: at least 1.8 bar
^ Oil pressure at 2000 RPM: at least 4.0 bar
If specified values are not obtained:
- Pressure relief valve or oil pump faulty, replace oil pump.