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agreed. the post cat sensors do go inside the cabin so you'll need to remove the carpet to get to the connector eh? with the right tools, the job is very easy.
When I bought my 97 the cel was on. The code was the right bank sensor. Knowing the previous owner never put a nickle in the car I assumed he also didn't use premium. I've been putting premium in the car and the light has gone off and stayed off. I have no idea if it is due to the fuel grade or not but the light is off.