Knock sensor is not a routine thing to change just at a certain mileage. Yes they do go bad but thats not the case with every car. They also dont just go bad at a certain mileage. Dont come in this guys thread talking like you know something about his car. You got nothing good to say or not interested in the car then just move along. Get the facts straight before you jump to an answer. I got nothing against you but you dont know what your talking about when it comes to this knock sensor thing. Bump for a Z car.