Ive been working on the DPF cars since their introduction.
Number of cars with an actual blocked DPF = 0
What tends to happen for various reasons the engine ecu thinks the DPF is blocked. Problem is the Guided Fault Finding that VAG insist we adhere to quite often fails the DPF as blocked.
There are several different revisions of G450 the pressure differential sensor and software has been optimised and recently the ones I have fixed have stayed that way. Had a few air mass meter problems that stops the regen process as it cant monitor the air mass properly (didnt however show an engine management fault for this).
Also worth pointing out VW recalled the Golf for he pressure sensor and map issues. Forced regen has to be carried out after replacing the sensor and doing the remap, best to get down as low as possible, they say 15 percent saturation is acceptable but I usually take it down to zero to be sure.
Aup Mate is there a way of Checking how blocked the DPF is in VCDS? ive got VCDS and im preety sure ive read you can check it
