TECHNICS – Volkswagen – Replace Diesel Particulate Filter (DPF) differential pressure sensor

1. TECHNICS - Volkswagen - Read ODB2 Diagnostic Error Messages.

In a previous post, we have discussed how to check your car diagnostic error messages using a cheap ELM327 ODB2 Bluetooth Adapter and the Car Scanner ELM OBD2 Android App.

After 70.000 kilometers, my 2.0 TDI engine suddenly lid the Engine Management LED.

After inspecting the diagnostic error messages using the tools mentioned above, I got the following error codes :

  • P154B
  • 31489
  • 31490

They are all related to a faulty PDF Differential Pressure Sensor.

This is a serious issue. Don’t keep driving your car in this situation. Because of the faulty sensor your car can no longer execute the DPF regeneration which will result in a blocked DPF. This way you go from a relative cheap repair to a very expensive repair.

2. TECHNICS - Volkswagen - Replace Diesel Particulate Filter (DPF) differential pressure sensor

Open the hood.

Remove the top engine cover.

Carefully open the heat protection sleeve.

The faulty Diesel Particulate Filter (DPF) differential pressure sensor had the VW part number 04L 906 051 G.

Withdraw the small grey security clip and then unplug the electrical connector.

Unscrew the torx screw.

Now carefully unclip the hose retention clip below the sensor.

Then carefully pull the sensor off both hoses. Mark the position of each hose so you don’t accidentally switch them when installing the new sensor.

The replacement Diesel Particulate Filter (DPF) differential pressure sensor has the VW part number 04L 906 051L. It’s an improved version and cost 79.30 €.

Firmly reconnect both hoses to the new sensor.

Reseat the hose retention clip.

Place and fasten the torx screw.

Connect the electrical connector.

Finally close the heat protection sleeve and reinstall the top engine cover.

Don’t be tempted to buy cheap alternative sensors. Ask your dealer, he knows best what parts are reliable.

After replacing the faulty sensor, use the tools mentions above to clear all relevant error codes from the car memory. Then start the engine and take the car for a spin. See if any errors return. In my case, all problems were solved.

In some cases the new sensor needs to be adapted to the system. This has to be done by your dealer.

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.