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 requirements

• Engine oil level OK, checking.

• Oil pressure warning lamp must light up for approx. 3 seconds when ignition is switched on

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

• Engine oil temperature at least 80 °C (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

- Remove Oil Pressure Switch (F1) - A - and install 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 voltage tester (V.A.G 1527 B) using adapter cables from connector test set (V.A.G 1594 C) to battery B+ and oil pressure switch (F1) - B -. LED must not light up.

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

If 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 (F1).

- Increase engine speed further. At 2000 rpm and an oil temperature of 80 °C, the oil pressure should be between 2.7 to 4.5 bar.

Tightening Specifications