Engine Oil Pressure: Testing and Inspection

Oil pressure and oil pressure switch, checking





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

Note: Functional check and servicing the optical and acoustic oil pressure warning:

Checking sequence





- Remove oil pressure switch -F1- and screw into tester.
- Screw tester into oil filter bracket in place of oil pressure switch.
- Connect brown wire of tester to Ground (-).
- Connect voltage tester VAG 1527 B using auxiliary cables from VAG 1594 A to battery positive (+) and oil pressure switch.
^ LED must not light up.
- If LED lights up, replace 1.4 bar oil pressure switch -F1-.
If the LED does not light up:
- Start engine and run at idling speed:
^ At 1.2 to 1.6 bar LED must light up
If the LED does not light up:
- Replace oil pressure switch.
^ Oil pressure at idling: min. 2 bar
- Increase engine speed further.
^ At 2000 rpm and an oil temperature of 80° C, oil pressure should be 3.0 to 4.5 bar.
If the specifications are not obtained:
- Correct possible mechanical damage, e.g. bearing damage.
- Replace oil filter bracket with pressure relief valve.

Note: At higher engine speeds the oil pressure must not exceed 7.0 bar.

If specified value is exceeded:
- Check oil passage.
- Replace oil filter bracket together with pressure release valve if necessary