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Re: 2012 Impala Will Not Run O2 Or Evap
Posted to Emissions Forum on 6/7/2018

I assume the o2 codes not ran are the P013A, B, C, and D? I am unsure exactly what GM is looking at to decide when to enter DFCO. At the minimum I would think TP, RPM, MAP if equipped, MAF, Time, Loop status and/or ECT, and maybe o2, and possibly vehicle speed... Login to read more.