I'm getting a "catalyst inefficiency code bank 2" on my son's 96 Z71
with a 5.7L engine. I was wondering if anybody had a way to actually
check to see if the converter is bad or if maybe the O2 sensors may be
causing the code. The converter is an expensive piece and I want to make
sure before I replace it that it is the actual problem. Also which side
is bank 2, driver's or passenger's???
If you're checking the code with something like the Auterra (etc etc)
scanner, look at the voltage readings coming off the sensors. If the faulty
sensor is reading one voltage all the time - chances are the sensor itself
is hooped (or the wiring going to it).
Easy to tell which sensor is which - just pull a plug, and see which voltage
reading drops to zero!
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