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2017 CTS V SPORT/2008 DTS/ 2008 STS V8 N*/ 2009 CTS 4
696 Posts
Morning all... Just went for coffee started car and check engine light came on. Pulled the codes and got this ECM code " P0133C" H02S Slow Response. Any one out there have any idea what this could be. Just so you know my father-in-law passed away and we are 14hrs away from home . presently in Moncton, NB. Did the whole 14 hour drive in one day a week ago Wednesday. Been here for over a week now helping my mother-in-law.But need to get home next week. The car ran fine... Just check engine light came on this morning.
You need a new oxygen sensor.

I would get it fixed at a dealer before you head back home if not it could throw you're fuel trims out and make the car run poorly on the way home and cost you as much in gas.

$150 parts and labor.
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