Originally Posted by BuraQ
I am running cP-e downpipes with highflow catts. I have ran E50 on the OTS E30 map and never gotten a fuel mixture fault
Btw you will never be on target when fuel mixing cause E85 is never exactly E85. Mixing a bit over E30 ie E34 as your did is ideal.
I am not saying to run E40-E50 running an E30 map. However you can run between E30-E40 on an E30 OTS map. Why your car spit that fault is weird, you might want to raise your Fuel Scalar to E35 calculation
The catts have nothing to do with that fault code, it could be also your O2 sensor going bad. I have been running E85 for almost 1.5+ years, and now stock and no codes
Had another question. You mentioned it could be the o2 sensors going bad? Im thinking you're talking about the pre cat sensors? I Thinking that could be the issue i changed the post cat o2 sensors a year ago and the pre cat are factory originals my car is an 07.