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Have you checked the codes it is throwing? If your engine light is on, most likely there is a reason. Take the car to a local autozone. They can pull the codes for free and tell you what they mean. http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info

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Q: 2000 Mazda protege check engine light always on?
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