Hello i am having troubles with the measure blocks on the G450 sensors, i put vcds on the car to read the measure blocks before and after dpf, and i am not getting a reading after the dpf but i am getting a reading before, the numbers should be around 3-7 while idling yet mine is about 45 while idling, on the measurement after the dpf i dont get any numbers, and by being so i am not able to regenerate the dpf, does anyone know how to fix this?

I think you will find that the G450 DPF sensor has 2x pipes coming off it, one will be routed before DPF, the other will be in the exhaust post DPF.

So it will be reading the value of the pressure between the 2x locations, meaning in your case you have a blocked DPF, and if you are at 45g of soot, I don't think you can even do a static regeneration.

 

Edited 21 July, 20223 yr by varooom
Image Added

i have tried cleaning the dpf recently but wasn't able to regenerate, also swapped the sensor and adapting it, yet no luck, i am willing to try anything i can before changing the filter, it has driven about 180.000km and was swapped out once before at 100.000km, is there any other way to unclog the filter so that i may be able to measure the pressure values and regenerate the dpf?

4 minutes ago, beder said:

i have tried cleaning the dpf recently but wasn't able to regenerate, also swapped the sensor and adapting it, yet no luck, i am willing to try anything i can before changing the filter, it has driven about 180.000km and was swapped out once before at 100.000km, is there any other way to unclog the filter so that i may be able to measure the pressure values and regenerate the dpf?

Can you explain what you mean by "tried cleaning the DPF recently"

 

I had a DPF issue recently, on a car I recently aquired.
Soot was below threshold of no return, (low 20's) but doing a static regeneration of around 40 minutes, could not get the soot below 15g, it hit a 'brick wall' so to speak.

This was after a 120 mile run, and not hanging about, strong acceleration etc.

 

Took it do a great friend with a garage, and he added some DPF cleaner down the DPF pressure sensor tube before the DPF

Rev to 2,500 for a bit, then off

Anyhow after more flushing/filling revving, it was put back together (DPF sensor)

 

And I then performed a static regen... this time it actually completed in a sensible fashion.

End result, it dropped down from a previous limit of 15g, to 2g.