I'm hoping someone can spread a bit of light on a boost issue that I have on a 2006 A4 2.0 TFSI. I have been struggling with boost/ performance issues since purchasing the car. I have replaced the DV, checked the HPFP and cam lobe, checked all solenoids and boost pipes, low pressure fuel switch etc, but to no avail! The strange thing is that the car pulls strongly after removing and refitting the fuel pump fuse, but only for about 20 minutes and then goes flat again. When checking on the computer it only brings up "Low fuel pressure fuel regulation: Fuel pressure outside specification. P310B - 004 ??? Anyone with any ideas?

 

I just recently (within the past two months) had this issue with my B7 A4. Main cause was my turbo bypass valve blew and I could hear my turbo spooling up a lot louder than normal (a super easy fix), but also had issues with my fuel pump (needed to be replaced - not cheap).

"Low fuel pressure fuel regulation: Fuel pressure outside specification. P310B - 004"

With the fuel pressure outside spec error code, I'd say check the turbo bypass valve first as it's the cheapest fix and if that doesn't work it may be your fuel pump/filter. Apparently, the filters get clogged and can ruin the pump, which is what happened to me.

Let me know how it goes.

 

Thanks for the info, will have a look tomorrow and let you know.

 

I checked the fuel filter and was clean. Swopped the HPFP with one from my sons S3 but still no boost!! I did a battery reset and the car boosts like a mad thing for awhile and then loses power after about an hour! Diverter valve is also new, so not sure where else to look!!!

 

I could hear my turbo spooling up a lot louder than normal (a super easy fix), but also had issues with my fuel pump (needed to be replaced - not cheap).