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I have an 03 cts 3.2l with a 5 speed manual 144,000+ iv put 4 new o2 sensors in checked all the fuses under hood and under back seat both sides i can clear the codes and as soon as I start the car the check engine light comes right back all 4 o2 codes i checked as many things as I can think of and this little light of mine keeps on shining someone please set me in the right direction o also if I clear the codes with the car running I know that's a no no but if I clear the codes while running I can drive 8 plus hours and the light doesn't come back unless I turn the car off and start it again any ideas r greatly appreciated
 

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2007 CTS 3.6 >130k miles
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Hmmm. It is possible that the new sensors are not compatible. Did you use OEM sensors or aftermarket? Regardless, if you still have the old sensors, I would do a simple compatibility test. Just reinstall the old ones (or just two of them), clear the codes, and then start the car again. If codes go away the problem is likely the new sensors.
 
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