Quote:
Originally Posted by steve99
If you want to eliminate the tune then get a stock rom and use romraider to set the P0420 cel code (cat efficiency) to disabled.
then run the modded stock tune and see if you get same problem.
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The problem is I ran stock tune and code P0420 shows up but I still have the same issue with AFR dipping to low 13s. I park the car and the next day its back to normal. I drive it in stop and go traffic and it doesn't do it. Only when I stay at 60mph+ for longer than 30 mins that I start seeing the AFR dip slowly till I get stuck in open loop. LTFT and STFT stay 0% Just like OP