I have had some errors coming coming up! mostly bank 1 errors with message 'too lean' and flap motor failure!
Could you post the full fault error messages?
Do you have the latest low fuel pressure sensor on your hpfp as the old ones were prone to fail.
Did you get your low pressure fuel pump (requested vs actual) and EGT logged?
What have you done about the flap motor failure error?
i will take a picture of the faults next time i get the chance to connect it to vcds and shall post them here!
about the sensor as far as i know the car is the 2006 model so it must have the old one! im the second owner so im only speculating here!
to answer your last questionabout the requested vs actual pressure, i honestly dont know what kind o logs my tuner did, he just told me that fuel pressure were ok!
about flap motor havent done absolutely anything yet, but im planing to remove the motor completely and deactivate the operation of it through the tuning software.
IF its of any kind of help to give you some hints about whats the problem i can say that the problem is not occuring randomly it has a specific something (boost - revs - amount of fuel i cant say what) where it occurs!
when the boost was higher and the car produced HP 285ish it would occur earlier like 5200-5400rpm.
now that its HP 270ish it happens at around 6000rpm
the above was repeatedly happening especially on uphill