Test procedure
- Remove oil pressure switch-F1- and screw oil pressure switch into tester.
- Screw tester into oil pan in place of oil pressure switch.
- Connect brown wire of tester to Ground (-).
- Using test leads from VAG 1594, connect diode test lamp VAG 1527 between positive battery terminal (+) and oil pressure switch.
- Start engine and gradually increase engine speed. LED should light up at 1.2 -1.6 bar, otherwise replace oil pressure switch.
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- Increase engine speed further. At 2000 RPM and an oil temperature of 80;deg; C oil pressure should be at least 2.0 bar.