If you are referring to O2 sensors, we have 4; 2 on each side, with one before, and the other after the cats on both sides. I don't think replacing them is as hard as determining if there is a need to replace them.
thank you, yes I ment 02 sencor. I dont need to replace them but I just notice there was more than one. No codes came up, but we are getting into the hot summers here in San Diego, I wonder if it would be wise to just have at least to in the car at all times?
I was 250 miles from my preferred dealer when mine was diagnosed. The service writer said the car was safe to drive that distance, but to have it fixed before long because the bad sensor would cause the fuel mixture to be rich, I would see a decrease in fuel economy, and that could damage the catalytic converters.
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