That's all true, not to mention not being able to pass state inspection with the CEL on as well as with it being on, you might be masking something more serious that is going wrong with your car. Just a bit of info about the ECU (not sure why you assume that you should change yours out): You CANNOT use an ECU from a different year. It has to be the same one that's in your car already or it won't work. A number of reasons for this which I won't go into right here or now.
Another thing...could have just gotten a batch of bad gas. Try buying higher octane gas and from a different place and see if your CEL for the knock sensor goes away.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.
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