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2003 CTS
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147 Posts
Discussion Starter #1
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.
 

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Registered
2003 CTS
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147 Posts
Discussion Starter #2
A little more info. It has been cold here at night. Below freezing untill last night. We had rain all night, stayed above freezing and fog in the air... Lots of moisture in the air.????
 

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Registered
2005 CTS/ 2008 DTS/ 2008 STS V8 N*/ 2011 CTS4 ALL W/D Pearl
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688 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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Registered
2003 CTS
Joined
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147 Posts
Discussion Starter #4
Thanks Tom's caddy... Took it to a local Chevy dealer. Had them do a diagnostic on it to be safe and so I could go back on them if it didn't fix the issue. As you said it was the 02 sensor post CAT on passenger side. Had it replaced... $359.00 ... Charged me $190 just for the diagnosis. Well its done now and crossing fingers that was the problem. Thanks again
 
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