Hi, dpf light came on the car, followed shortly by limp mode and flashing glow plug. Borrowed a garage machine and was 24g of soot. Drove the car hard on motorway as it requires. All light went off. 4 days later light back on and limp mode. Did another forced regen and got levels back to the vag app 9grams but still wont remove light or limp mode. I have cleared the codes via the carista app. Still says dpf fault and air flow mass sensor. Please help

You should make sure the EGR valve is clean and can shut properly but first you need to address the MAF problem by replacing it.

1 minute ago, sepulchrave said:

You should make sure the EGR valve is clean and can shut properly but first you need to address the MAF problem by replacing it.

Think its had a egr delete. Not sure though. Tried unplugging the maf. Just dont want to put one on if its a faulty wire

5 minutes ago, Leady7902 said:

Think its had a egr delete. Not sure though. Tried unplugging the maf. Just dont want to put one on if its a faulty wire

 

So bell the wires out, there's no easy way to tell and a MAF really isn't that expensive if you shop around.

If it's had an EGR delete then the DPF is stuck in permanent regen. the EGR must have been mapped out, unplug it and see if any codes are thrown.

Grey/white wire from ECU pin 39, grey/red from ECU pin 18, black/yellow is ign switched 12v from cabin fuse 3.

56 minutes ago, sepulchrave said:

 

 

If it's had an EGR delete then the DPF is stuck in permanent regen.

 

Could you expand on that please?

 

I ask because I fitted a DPF emulator last week, the car runs much better and returned 52mpg on a 750km autoroute journey last night whereas I got 46mpg on the same journey 12 days ago.

 

Today I noticed a regen taking place when I switched off which has only happened once before but I have driven 2000 kms in the last 12 days, I had checked on VCDS and a regen took place on the journey down so maybe there would have been several anyway.

 

I am a bit alarmed to think that it could be stuck in permanent regen and cant work out why that should be the case as I dont think there is any link other than on a standard engine EGR is inhibited during a regen.

EGR is shut during regen. EGT's are therefore higher, higher EGT's are what promote regen.

 

Simple logic really.

 

If your EGR is permanently shut then your EGT is permanently higher so your DPF will run hotter and thus cleaner.