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can you tune out the after cat O2's?john-e-boy 09-14-2006, 05:26 PM Can you tune out the after cat O2's or do you have to get sim's? If you can will one of the hand held programmers do it (Hypertech, Diablo) or do you have to have it professionally tuned? 2000GTP 09-14-2006, 06:11 PM Yes, the rear 02s can be tuned out of the PCM. The Hypertech programmer will not do it though, you will need a professional tuner to edit the PCM for you. 97WS6Pilot 09-20-2006, 08:29 AM Yes, the rear 02s can be tuned out of the PCM. The Hypertech programmer will not do it though, you will need a professional tuner to edit the PCM for you. Tunercat will do it. You just simply uncheck the boxes for the codes you don't want to illuminate the service engine soon light.:) | ||