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I replaced all four of mine (recommended) and boy, did it improve performance and fuel economy after driving the car for a day or two. The computer needs to recalibrate itself after this is done I guess.
It was just about the best $450 I ever spent on my car to tell you the truth. It's a lot of cash for just sensors, but they make the motor run a lot better when you have four brand new ones on board.
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