Engine Oil Pressure: Testing and Inspection

Oil pressure and oil pressure switch, checking

Special tools and equipment:

^ VAG1342 Oil pressure gauge
^ VAG1527B Voltage tester
^ VAG1594A Connector test kit

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 auxiliary heater on sound insulation.





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





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





- Remove 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 VAG1594A connector test kit, connect VAG1527B voltage tester to oil pressure switch and Battery positive (+).
^ 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
^ At 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.





- Remove 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.