Oil Pressure Sender: 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)

• Vehicle diagnostic, testing, and information system (VAS 5051)

Test Conditions

• 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 ; "Guided Functions".

Test Sequence

- 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 1594 C) to B+ and oil pressure switch.

• LED must not light up.

If the LED lights up:

- Replace the 0.7 bar oil pressure switch (F1).

If the LED does not light up:

- Start engine and increase engine speed:

• The LED must illuminate at 0.55 to 0.85 bar positive pressure. If it does not, replace the oil pressure switch.

- Increase engine speed further.

• At 2000 RPM and an oil temperature of 80° C, the oil pressure must be at least 2.0 bar.

• At higher engine speeds oil pressure must not exceed 7.0 bar

If the specification is not obtained:

- Check screen in intake line for soiling => [ (Item 10) Suction line ] Oil Pump and Oil Pan Assembly Overview.

• 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 => [ Oil Pump ] Oil Pump.

If the specification is exceeded:

- Check oil channels.

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