Update (short version, as I will post with pictures later):
I took the car in to service at Fontana Nissan last week because the car kept throwing a CEL light. The code was P0456, which denotes a pinhole-esque leak in the fuel evaporator system. I thought it was a gas cap issue; and so did everybody else.
Well...long story short, it wasn't. My Amuse exhaust caused issues with the fuel system's charcoal canister, and I had to replace the charcoal canister out of pocket. The car is back with the exhaust dropped almost 2 inches to mitigate any interference issues. I'm still trying to figure out what happened, and what to do.
Pics and an improved write-up to follow, but I'm posting this up here because I'm out of ideas, so I'd like to hear some thoughts from the community.
Special thanks go to Frank and Jerome @ Fontana Nissan for helping me out, and Mike @ BPAuto for his continued support
