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Re: 2012 Impala Will Not Run O2 Or Evap
Posted to Emissions Forum on 5/21/2018 3 Replies

GM o2 monitors have gotten to be more difficult as time has gone on. I don't bother with the evap. monitor since the DC is so insane. He can check in use performance tracking in OBDII generic and i'll bet it shows the rear o2s not completing. He can also go in... Login to read more.

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