Working on a 2006 GTI 2.0T
Was previously boosting around 19 PSI (Bought this way with little info). Was coming back on a long drive and started getting underboost. Okay, removed the Diverter valve to find it in 3 pieces despite being new style. Also noted a "Forge" brand spacer. (Have yet to notice any boost taps?)
Just replaced the Diverter valve with a new one/ new ECS spacer. Checked for tightness/Plug and everything is snug and clicked into place. Car still only builds around 1 PSI / Code cleared nothing returning at the moment
I'm guessing my checklist is:
Check 249/N75? Are they the same or different? This looks difficult to change compared to the rest so it's probably this?
Intercooler pipes / leaks
Anything I'm missing? The hell is the N75 on this car? n249 sits above the diverter valve yeah?