I'm just starting this thread to document what I'm going through after my engine was replaced under warranty by Subaru.
After getting my car back the engine was making this clicking sound from the driver side (I think). Bring it to dealer, they essentially say that it's a non-issue because of something in the direct injection being the cause of the sound. Not the "crickets" sound, but the clanking/clicking.
So I go drive for < 30 mins and the whole car is vibrating while idling and the CEL pops up. Autozone diagnosed it as a P0302 (misfire of cyl #2) so I take it back. Next morning dealer says that they aren't getting a P0302 but an air-fuel mixture ratio imbalance. Ok... so they put booster in it to help the octane levels. Mind you, this car has been in their hands for over 5 months (don't get me started) with the same gas sitting in it.
I suspect the stale gas is to blame, so I'm trying to burn through it in the meantime. When I got it back I filled the tank up to full with 93 octane, which was about 5 gallons. I just burned through that and filled up when the low gas light came on with 11.5 gallons of 93. Still have the clicking sound and I just got codes for P219A, P119F (both air-fuel ratio imbalance) and P0302 (misfire cyl#2). I might have to completely go through another tank before it fixes itself? IDK.
Oh, and the kicker to all this? I'm leaving for military training in a week so I'm kind of SOL if I can't find out what the problem is before then.
I'm open to suggestions but I'm just getting this down in case someone runs into a similar issue.
video of sound with CEL coming on:
and here's the service bulletin the dealer quoted:
https://subaru.oemdtc.com/TSB/09-54-12R.pdf