Well, ran the built-in trouble code diagnostic-ator....nothing. Just the crystal-clear display of my mileage. Of course, I haven't had a CEL either so maybe that's why. RRRRRRR! Saturday, I'll crawl under it and check the knock sensor. Maybe it's loose or something.
MX-5 - thanks for the P0402 info. I've actually followed that exact procedure once or twice before. I think I may have to check the EGR valve itself. I'm told some carbon can build up in there. Or maybe it's a sensor issue. I'm not sure. I've been fighting/living with it for nearly two summers now. What year is your MX-5? What's your handle on Miataforum?
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