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I had the same issue as the guy above, threw code P0016 and slip light. Car seemed to run fine, but idle was a little funky.
Brought it in for warranty repair with 26,000 miles, dealer didn't ask much about mods. I took off header/full exhaust and put back stock system and flashed back to stock tune with OFT before I brought it in.
Car fixed four days later. They replaced ECM with an updated one, i'm guessing thats another term for ECU? They also replaced unti-EGI Control module. Car runs great again, seemed to fix the idle dip issue as well.
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