I cleaned the throttle body and replaced the MAF last winter chasing a CEL, it ended up being caused by a vaccum leak near the recently replaced AOS instead though.
The idle was acting like a vaccum leak issue for sure, but it was rather well behaved and smooth, just gradually increasing until 2 then drop and increase again.
No CEL this time and the car drove normal on the next drive.
Kinda puzzling.
I wonder if the battery was disconnected for any reason when it was at the dealer just recently and maybe that has something to do with the car relearning to idle or something.
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