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Tried searching, but couldn’t find an answer. 2019 Base. Am I missing a hose from the air box to the open fitting here?
It looks to me to be a drain for the air box, but the open hose fitting is a bit disconcerting.
Good question. In Audi installations, these fittings are for the Activated Charcoal Filter (ACF) purge line. The ACF absorbs fuel vapors when the engine is off. It is purged during engine operation by venting those vapors into the intake system. In this case, the vapors are vented into the fitting on the air / oil separator.
Reference: Pages 21-23 of Audi EA 389 Self Study Program, attached below.
However, in each photo I could find online, the Cayenne configuration does not use this hose. Presumably, Porsche uses a different hose connection to purge the ACF canister. I’ll save that research for another day.
Missing hose?
