I'm hoping for help and input while I work on finding shop(s)/appointments etc..and parts to order. I DAILY my 2014 FBO on flexfuel for 2+ years now. I barely run on e85. been a year i haven't. Always on pump 93.
2 years ago, I got a CEL and checked my accessport showing:
-P0138 - O2 Sensor circuit high voltage (Bank 1 Sensor 2)
-P0139 - O2 sensor slow response (Bank 1 Sensor 2)
-P0158 - O2 Sensor circuit high voltage (Bank 2 Sensor 2)
-P0159 - O2 Sensor slow response (Bank 2 Sensor 2)
I cleared the codes and never got it again for 2 years, until recently. In the past 2 months, I've been getting the same codes (not all 4 together-varies) probably 5-6 times (2-3 days apart after clearing codes).
Before these codes starting showing up more often, I drove one night on an empty strip on manual.. floored from 2nd to 5th ran fine. On my way back, the boost cuts at 4K rpms and car won't accelerate even when pedal is fully pressed. But no CEL. I stop for a second and its back to normal.
I noticed this keeps happening when I accelerate over 4K rpms, and shift up... then won't pass 4K. Using cobb I had the following Limp Status: 02 (which is STFT failure). Also STFT ranges from 85%-125%. I ran a datalog to send to tuner...just waiting to get a cable. I lost it lol.
in the meantime .. until I send the datalogs. I would appreciate any help so I could speed things up. is this just a fuel pump failure that needs to be replaced? is it caused by the O2 sensor that ive been ignoring lol? Thanks!
Edited by majj35, 29 March 2017 - 11:55 AM.