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Re: oxygen sensor
20.00 for a sensor? oh man, dont put a junky one in stick with quality AC delco!!! To answer your question, no you dont have to change both. The one before the cat converter is the only one that senses the air fuel ratio. The one behind the cat is only there to monitor cat efficiency. If the CEL isnt lit, just leave that one alone.
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-2000 Grand Prix GTP 170,000mi (daily driver)
-2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal)
-1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix])
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