Not sure if this is where I post for this repair but, I have an 09 JCW, I'm getting the 2885 error code (boost deviation plausibility). First place I checked was the diverter valve thinking the boot inside was cracked/destroyed like many of you have encountered. Boot is fine but the black "tophat" looking thing lol that covers the rubber boot is brittle n starting to chip around the sides but still works. Added a forge BOV adapter and I can hear the Whoooosh sound more, so, I don't think that's the source of the deviation. My next trial is replacing the vacuum lines because when I get on it, I can get through all the gears fine 5000+ rpms except once I go from 5th into 6th my limp mode light (half yellow engine) lights up. I will say that on start up in the morning during cooler temps this is not really an issue but once the day heats up my half yellow engine light will display and sometimes it will light up from 4th going into 5th so I'm thinking my vacuum lines are getting soft n collapsing.
my question is, does anyone one know the size of the inside diameter and how much vacuum line I should buy. I want to go with aftermarket maybe from ICS tuning they have forge vacuum line for sale. Sorry for such a long post just wanna be thorough.