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)

• Socket 24 mm and Jointed Extension (T40175)

• The engine oil level is OK

• The engine oil temperature at least 80 °C (176 °F) (the coolant fan must start up once).

• For the function test and servicing the optical and acoustic oil pressure indicator, refer to the wiring diagrams and to "Function and Component Selection" in the vehicle diagnostic tester.

- Remove the oil pressure switch (F1) and install it in the pressure gauge.






- Thread the oil pressure gauge into the oil filter adapter, in place of the oil pressure switch.

- Connect the brown wire on the gauge to ground (-).

- Connect the voltage tester (V.A.G 1527 B) using an adapter cable from the connector test set (V.A.G 1594 C) to battery positive (B+) and the oil pressure switch. The Light Emitting Diode (LED) must not light up.

- If the LED lights up, replace the oil pressure switch.

If the LED does not light up:

- Start the engine and increase the engine speed: The LED must illuminate at 1.2 to 1.6 bar. Replace the oil pressure switch if it does not.

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

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

If the specification is not obtained:

- Check the screen in the oil intake pipe for contamination.

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

If no malfunction can be found:

- Replace the oil pump, refer to the following:

Engine codes CBTA and CBUA, refer to => [ Oil Pump ] Oil Pump.

If the specification is exceeded:

- Check the oil passages.

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