I have a similar problem. I replaced both O2 sensors after trouble codes advised they were bad/cleared codes then about 20 miles codes came back.However i did not replace the CAT.I was woundering if i have the front O2 sensor in the back and vise versa
What were the codes??? You should have gotten one code if it was only one O2 sensor that went bad. If all three O 2 sensor went bad you would have gotten three different codes. P0031 (bank1 sensor1) P0051 (bank2 sensor2) P0061 to P0064 O2 sensor after the catalytic. Hops this helps.
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