I've had power problems on my B5.5 Passat (05, 130bhp, AWX) for a while. I thought it was down to the flexible exhaust coupler leaking badly. I had VW do a service on it I had a new flexible welded in right after the service. There's no more smell but still power problems (it feels like no turbo) for eg. 40mph in 3rd gear. I brought it back to VW and they say they have to replace the EGR valve @€500, as there is a EGR fault in diagnostics. All faults cleared during the service but emissions workshop message popped up and check engine light came on soon after the service.

From the report during the service there are the following faults:

P3130 EGR system Control limit reached
Fault type 1: lost23
Fault type 2:Intermittant

P1556: Charge press. ctrl. Value below lower control limit
Fault type 1: lost23
Fault type 2: Intermittant

I noticed that the shudder valve doesn't budge when I turn off the engine. It moves easily when I use my finger.

It looks like I may have a vacuum problem, anyone have any idea what to troubleshoot to try and resolve this power problem?