Oil Pressure and Oil Pressure Switch, Checking

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 1594C)

• Engine oil level OK.

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

• For the functional check and servicing of the optical and acoustic oil pressure warning: wiring diagrams and "Function and Component Selection".

- Remove oil pressure switch (F1) and screw 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 kit (V.A.G 1594C) to B+ and oil pressure switch. LED must not light up.

- If LED lights up, replace 1.4 bar Oil Pressure Switch (F1).

If LED does not light up:

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

- Increase engine speed further. At 2000 RPM and an oil temperature of 80 °C, oil pressure must be between 2.7 and 4.5 bar.

At higher engine speeds oil pressure must not exceed 7.0 bar

If the specification is not obtained:

- Check screen in oil intake pipe for soiling.

• Also, mechanical damage e.g. bearing damage can also be the cause of too low oil pressure.

If no malfunction can be found:

- Replace oil pump:

Engine codes BGP and BGQ => [ Oil Pump ] Service and Repair

Engine codes CBTA and CBUA => [ Oil Pump ] Service and Repair

If specification is exceeded:

- Check oil channels.

- If necessary, replace oil filter bracket with pressure relief valve