Oil Pressure Sender: Testing and Inspection

Oil pressure and oil pressure switch, checking
Special Tools and Equipment





^ VAG1342 oil pressure gauge
^ VAG1 527B
^ 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 on noise insulation.





^ Remove bolts or quick-release screws -1- and -2- and remove front noise insulation.





^ Disconnect electrical harness connector at oil pressure switch (arrow).





^ Unbolt oil pressure switch and install VAG1342 oil pressure tester.
^ Install oil pressure switch -2- on VAG 1342.
^ Connect brown wire -1- of tester to Ground (GND).
^ Using VAG1 594A connect test kit, connect VAG1 527B 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.





^ Unbolt oil pressure switch and install VAG1342 oil pressure tester.
^ Install oil pressure switch -2- on VAG 1342.
^ Start engine (engine oil temperature approximately 80°C).
^ Oil pressure at idle: at least 1.5 bar
^ - Oil pressure at 2000 RPM: at least 3.0 bar
If specified values are not obtained:
^ Pressure relief valve or oil pump faulty, replace oil pump.