oxygen sensor is located on pre-cat that immediately follows the turbo if you got a turbo version of the car. I don't know where it is on NAs.if your car is up and good , then gas mileage is depending on how you drive the car. shifting at 2500rpm is obviously going to be different than shifting at 5000rpm. look at the classified on this forum and there are ads that can direct you to their websites, that's usually where most poeple on this forum got their parts :How to remove oxygen sensor, and what is a great website for parts for my vehicle? All answers are greatly appreciated.
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