Oil Pressure Sender: Testing and Inspection

Oil pressure and oil pressure switch, checking

Special tools and equipment:

Special tools and equipment
^ VAG 1342 Oil pressure tester
^ VAG 1527 B Voltage tester
^ VAG 1594 A Connector test set

Requirements
^ Oil level OK
^ Engine oil temperature approximately 80°C.
^ Oil pressure warning lamp -K3- must come on when ignition is switched on.
^ In vehicles with auto-check system, lamp must light up to indicate OK status (interrogate symbol).

Checking oil pressure switch
- Disconnect wire from oil pressure switch.





- Remove oil pressure switch and screw into oil pressure tester VAG 1342.
- Screw oil pressure switch -2- into VAG 1342.
- Connect brown wire -1- of tester to Ground (-).
- Connect voltage tester VAG 1527 B to oil pressure switch and positive terminal of battery (+) using test leads from VAG 1594 A.
^ LED should not light up
If LED lights up:
- Replace oil pressure switch.
- Start engine.

Note: Switching point of oil pressure switch can be reached when engine is cranked on starter motor, so watch tester and LED while starting engine.

Black oil pressure switch
^ LED should light up at 1.2 to 1.6 bar

If LED does not light up:
- Replace oil pressure switch.

Checking oil pressure
- Disconnect wire from oil pressure switch.





- Remove oil pressure switch and screw in oil pressure tester VAG 1342.
- Screw oil pressure switch -2- into VAG 1342.
- Start engine (engine oil temperature approximately 80°C).
^ Oil pressure at idling speed: 1.0 bar
^ Oil pressure at 3000 RPM: 3.5 to 4.5 bar

If readings do not match specifications:
- Pressure relief valve or oil pump faulty, replace oil pump.