glendemon Posted January 8, 2012 Share Posted January 8, 2012 My check engine light in my 2002 ES 300 came on. It does always stay on. Sometimes it goes off and the car runs fine. As I am driving it,the light comes on and the car runs very rough. I'm wondering if this is necessarily the knock sensor but could be something else, ie, wiring harness, tune-up? Quote Link to comment Share on other sites More sharing options...
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