[NowaChevyGuy]

Hey all,

So here is the scenario,
2016 RS (V6). JMS Throttle Controller and K&N CAI been on for 2 years. 2.0T M diff (3.23s LSD) and Trifecta tune on over a year. All running with no problems. I recently installed SS Brembo front brakes, when in with no issues.
Then I get a check engine light for P0174, lean bank 2.
Took it to the dealer. They smoke tested and said they found a loose hose on the intake and fixed but couldn't reset the CEL because the ECU was locked (my own fault not detunning before taking it in). So I get it home and pull the negative cable for 20 minutes and run CEL free for 2 days and bam it's back.
I found the plastic elbows on my CAI were a little loose so I replaced them with metal, pulled the neg again and reflashed my Trifecta tune. CEL free for 4 to 5 days and bam it's back again.
The odd thing is every time it has come on has been at idle in drive like at a light or after just pulling into a parking spot.
The dealership were kind of knobs blaming everything on the aftermarket. They had that dumb dealership look on their face when I asked if it was a hose on the CAI why only a bank 2 error and not both 1 and 2? Yea, $160 to reconfirm their bubbleheads as always. I know I can throw a little owner attitude and get it looked at again less then $160 but what a PitA so figured I would throw it out here.
Which side is Bank 2? I know it goes by Cylinder number but is it the driver or the passenger? And what vacuum items run off of that side? I guess it could also be an injector or o2 sensors as well.
My Challenger is HPTuners tuned so I can run the live monitor with that or the Trifecta logging but what do I look for? Also thinking about doing a propane test tomorrow for any unseen vacuum leaks.

Any input (positive please) is much appreciated.

[NowaChevyGuy]

Anyone?