With VAG Tester 1598

0.3 bar oil pressure switch
- Connect VAG 1598/4 adapter harness to 26-point instrument cluster connector (green).
- Connect adapter harness to VAG 1598A test box.
- Set digital multimeter (Fluke 83 or equivalent) to measure resistance (Ohm).
- Connect multimeter between socket 5 of VAG 1598A test box and Ground (GND).
- Must be 0 ohms (continuity)
- Start engine.
- Must be infinity ohms (no continuity)
If specified results are not obtained:
- Check wiring for open circuit according to wiring diagram, repair as necessary, or
- Replace oil pressure switch.

Oil pressure switch
- Connect VAG 1598/13 adapter harness to 14-point instrument cluster connector (black).
- Connect adapter harness to VAG 1598A test box.
- Set digital multimeter (Fluke 83 or equivalent) to measure resistance (Ohm).
- Connect multimeter between socket 22 of VAG 1598A test box and ground.
- Must be infinity ohms (no continuity)
- Start engine.
- Must be 0 ohms (continuity)
If specified results are not obtained:
- Check wiring for open circuit according to wiring diagram, repair as necessary, or
- Replace oil pressure switch.