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on my 02 millenia the check engine light is also on. i work for a dealership,so i plugged in the ecm reader(ecm is the cars computer) and it read out that my egr valve was bad. as long as the light isn't blinking than u either have bad o2 sensor or the egr valve. either one being bad will only cost u a mile or two on ur gas mileage.

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Q: If the chek engine light is on in your Mazda millenia 2002 what does thi light mean?
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