Just got truck back from chrysler(I know the service manager)and they scanned the computer because my ses light was on.They said it was code P0332 and GM parts guy said it was "Knock Sensor 2 Circuit Low Input" and to replace o2 sensor.My guestionis which of the 4 sensors do I replace.

 

I don't know why you would replace an o2 if the knock sensor was bad.

That code is for the rear knock sensor.

 

I was thinking the same thing ...