Oil Pressure Sender: Testing and Inspection

Oil pressure and oil pressure switch, checking
Special tools and equipment





^ VAG 1342
^ VAG 1527 B
^ VAG 1594 A

Test 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 in 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: at least 1.3 bar
^ Oil pressure at 2000 RPM: 3.5 to 4.5 bar
If readings do not match specifications:
^ Pressure relief valve or oil pump defective, replace oil pump 17-27.