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  1. Multiple O2 sensor codes 2008 CTS P 0050, P 0155, P 0150

    2008-2013 Cadillac CTS General Discussion
    Car had been throwing p0050 code at me for a while. Changed o2 sensor with cheap online model. It took away my check engine light, and everything was fine for 2 months. Noticed a rough idle and check engine light on again this week. Checked codes and i'm getting the p0050 again, plus a p0155 and...