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Originally Posted by Ken Downs
My 1999 Miata check engine light stays on all the time. If the code is reset the light stays off for a few days and then returns. Autozone says it is a problem with the EGR valve. I removed the valve to check for carbon build up and clean it. Reset the codes by disconnecting battery. Of course the light came back on after 3 days. But long enough to pass emissions test!! Anyone heard of problems with the EGR? They are $250, I would like to avoid buying a new one. Sometimes the car will idle rough thought it might be related to the coil problem described in the other post. Any connection to the EGR?
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I have a 1999 and last year I had the local guy check to code and said he had to change the EGR sensor, it was good for a few 100 miles and the lihgt flashed on again, but like yours when it is off or on it runs really well but when it flases it feels like only have the engine is working. anyone with ideas?