Engine Oil Pressure: Testing and Inspection

Oil Pressure and Oil Pressure Switch, Checking

Special tools, testers and auxiliary items required

• Oil Pressure Gauge (V.A.G 1342)

• Voltage Tester (V.A.G 1527 B)

• Connector Test Set (V.A.G 1594 C)

Test Prerequisites

• The oil pressure warning lamp must light up for approximately 3 seconds when the ignition is switched on.

• On vehicles with Auto-Check-System, the indicator "OK" must light up (check symbol).

• Engine oil temperature at least 80 °C (176 °F) (radiator fan must start up once).

• Function test and servicing the optical and acoustic oil pressure indicator: Wiring diagrams, "Function and Component Selection".

Test Sequence

• For the correct tightening specifications, refer to => [ Oil Filter Bracket Overview ] Oil Filter Bracket Overview

- Remove the oil pressure switch (F1) and screw it into oil pressure gauge.






- Thread oil pressure gauge into oil filter bracket in place of oil pressure switch.

- Connect brown wire of tester to Ground (GND).

- Connect the (V.A.G 1527 B) using adapter cables from the (V.A.G 1594 C) to battery positive and oil pressure switch. LED must not light up.

- If LED lights up, replace 1.4 bar oil pressure switch.

If the LED does not light up:

- Start engine and increase engine speed: LED must light up at 1.2 to 1.6 bar positive pressure, otherwise replace oil pressure switch.

- Increase engine speed further. At 2000 RPM and an oil temperature of 80 °C (176 °F), the oil pressure should be between 2.7 bar and 4.5 bar.