Isuzi Rodeo

Most newer cars have multiple O2 sensors. They are now in front of the converter, and usually after the converter as well. Great care must be taken with the wiring harness for the sensor, if it touches the hot exhaust pipes it will melt and ground out, and mess up the reading. Also the oxygen sensor code can be the result of a bad egr valve, which may need cleaning or replacement, or a plugged fuel injector, or bad pressure regulator, or even a bad air cleaner. I tell everybody with the newer cars, clean the throttle body of the fuel injector, or have it done, it is cheap and easy to do, and always use fuel injector cleaner every third tank of gas. You really should buy a scanner or go to a parts store like Auto Zone where they will scan your car for free, and make a reccomendation. Also sometimes the aftermarket O2 sensors don't work very well, especially the ones from Auto Zone, go figure.

I would be careful what AutoZone says. You have to remember, these peope sell parts. They do not fix cars. Also, there are multiple codes for O2 sensors. They don't all mean the O2 sensor is bad.