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Ok, so currently sat in the car. Tried service regen of dpf - completes instantly. Dpf pressure is at 0hPa and doesn't change when driving or reving etc. So do you think a gremlin has been in and mapped it out or faulty sensor? Surely if sensor was faulty I'd get a CEL. Thanks for your help so far.

Will double check the reading tonight. From what I was told the dpf is intact and no mapping has been done but you never know what's true when buying a used car... Haven't noticed excessive soot on the tailpipe and I never get any smoke out of it even when booting it so to my knowledge the dpf...

Thanks for the reply. The graph you see is only 1st through 2nd. I will be doing a propper run soon when I get the chance. An example of requested and actual boost pressure is requested 2589hPa actual 2206hPa. I know they aren't going to be bang on but this seems a considerable difference...

Hi guys, so I'm having ongoing boost issues with my b8. I keep getting an Underboost cel. I've found if I drive the car hard it will overcome this and work for a while, then will come back after driving normally for a day or two. I first thought it was a dpf issue as it goes away after driving...

Bump

Another note, never really get boost in 1st gear.

I'm on the Isle of Wight mate. What would I be looking for in vag-com? Specified Vs actual boost? Map sensor was the next thing I was going to try.

Hi guys, first post on this forum and not sure if I'll get the help I need. I have a 2008 A4 B8 3.0 TDI. The problem I'm having is inconsistent boost. Sometimes it pulls ok (mostly above 2.5-3k) other times I'll get an Underboost code. I've had a garage look at it and try an fix the problem. He...