Originally Posted by TieFighter
Also I want to note that just because 1 O2 is faulty does not require you to replace any others. If you use GM parts and the fault has been diagnosed CORRECTLY there is no need to replace other sensors.
If that was the final say and you were CORRECT in your assumption, why has GM continued to pass along the need to try changing the other sensors also? A quick look at numerous forums on this very issue shows they recommend this course of action a lot when involved with service departments having no luck fixing the issues and vehicles continue to throw the code. High mileage sensors are like any other parts, they lose their tolerances and performance levels and do not always to continue to meet factory specs. Using a new and old sensor together DOES in fact still leave the door open for the computer to flag these variances as an issue. It isn't a case of every other tech being less capable of diagnosing such issues.
And for your information, since you feel the need to shoot down anything you disagree with, GM does not make sensors and neither does AC Delco. They're reboxing Chinese sweat shop parts as most companies now do. Case in point, Delphi Controls is now working out of a crap hole in China slapping trogether sensors and control devices since the US workers were canned to increase corporate profit. To claim the use of a supposed GM made part is a superior repair procedure is ludicrous and uninformed to say the very least.