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Thanks for the info.....I'm at the process of selling my car and don't want the next owner to deal with this problem. The car works great other then the engine light coming on every now and then so I will check the wiring first and then move on to replacing the knock sensor.

Thanks for the reply. Meaning its not the 02 sensor. Would it cause the check engine light to come on? And what purpose does it serve? Again Thanks.

I have a code and don't know how to read it. It reads ----- and then repeats again ----- .Ithink its o2 sensor in front of cat but not sure. Thanks for any help. Its an 92' mx3 V6.........