Oil Pressure Sender: Testing and Inspection

Oil pressure and oil pressure switch, checking





Special tools and equipment
^ VAG 1342 Oil pressure tester
^ VAG 1342/14 Adapter
^ VAG 1527 B D lode test lamp
^ VAG 1594 A Adapter set

Test conditions
^ Engine oil level OK, checking, Refer to Engine Lubrication, Service and Repair.
^ Engine oil temperature at least 80°C (radiator fan must have run once).
^ Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.

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

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

Checking oil pressure switch
- Remove center, left and right insulation trays
- Remove front bumper
- Bring lock carrier into service position





- Remove oil pressure switch -F1- and screw into tester.
- Screw tester VAG 1342 with adapter VAG 1342/14 into oil filter bracket instead of oil pressure switch.

Note: Observe installation position of adapter: The tapered connecting socket of the adapter is screwed to the pressure hose of the tester.

- Connect brown wire of tester to Ground (-).
- Connect diode test lamp VAG 1527 B to battery positive (+) and oil pressure switch using adapter cables from VAG 1594 A. LED must not light up.

If the LED lights up:
- Replace oil pressure switch -F1-, Refer to Oil Pressure Sender, Service and Repair

If the LED does not light up:
- Start engine and run at idling speed. At 1.2...1.6 bar LED must light up; otherwise replace oil pressure switch -F1-.

Checking oil pressure
- Check oil pressure at different revolutions:
2,000 rpm: 3.0...5.5 bar
above 2000 rpm: maximum 7.0 bar.
If the specifications are not attained:
- Repair mechanical damage, e.g. bearing damage.
At higher engine speeds the oil pressure must not exceed 7.0 bar.
If the specification is exceeded:
- Check oil galleries.
- Replace oil pump if necessary.