Should I be worried?
So today I was driving around like normal. Came home parked the car. When I left about 2 hours later, I noticed my engine light was on. Went to Autozone, and it was code p0174. I"m trying to narrow down why this is. The o2 sensor on the passenger side is brand new. After Autozone, I went to the gym. Leaving the gym, the light was still on. I gave it about half throttle, and the engine light went off and hasn't come back on since. Since I've been home, I disconnected the battery for about an hour, and then put it back on. I've taken the MAF and filter off and cleaned them both (AEM dryflow filter). I'm still waiting for the filter to finish drying and then I'll put it all back together. Now if I'm driving around and the light comes back on, what should I look into next? The o2 sensor on the passenger side is maybe 1.5 months old. The car is already street tuned with HPTuners for all of the current mods.
2006 PBM GTO A4...Pacesetter 1-3/4 longtubes, 3in offroad mids, Spintech dumps...AEM Intake, ported LS2 manifold, ported LS2 Throttle Body...Drilled/Slotted Rotors...Pioneer Speakers...Bohnman Splitter...Lovells RR bushings and Poly Strut mounts...Lovells 0 drop springs...6000k HIDs in heads and fogs