I had the same code after installing my ART pipes. Car was running rich. I replaced the ART pipes with Stillen HFCs. Code went off for a week and came back on. I had to take it to the dealer to get reset. I'm going to drive it for a while before I decide to put the ART pipes back on. If I decide to put them back on.
I did notice that the car is much slower with the HFCs though.
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