1.8t P0299 boost issues

[JoeM5952]

Working on my sons car which is a 2004 A4 1.8t Quattro with the AMB engine I believe. Running into some problems with a recurring CEL for P0299 and some not great mileage. In early spring we got this code and I replaced the DV as the old one had failed and also the brake booster check valve as that was not functioning properly also. It was working good until recently where we are getting this code again. I check resistance on the N75 and it is measuring a steady 30 ohms which I believe is in spec. I cleared codes and went on a little drive with some WOT pulls and it showing as a pending code again already. I did a visual of the vacuum lines and sprayed brake cleaner around the engine bay with it running and saw no difference in idle.

I took a log of blocks 115 and 118 if anyone wants to take a look, uploaded to google drive since it wouldn't attach here for whatever reason.

https://drive.google.com/drive/folde...usp=drive_link

[Cybersombosis]

Do a boost leak test. Get a 3” ABS end cap and cut a 1/2 inch hole in the end. Get a tire valve and pull it through the end. Undo your hose clamp to your air box and shove the end cap in the end of the TIP and tighten the clamp. Take a wine cork and plug the PCV pipe hole in the TIP. Get a hand pump or a compressor and a tire inflator valve and pressurize the system and listen for leaks.

Attachment 329717