Not sure what you're asking. All of the sensors feed information to the Engine Computer, and all have something to do with preventing or controlling emissions. Since the Check Engine light is on, there will be at least one diagnostic fault code stored in the Engine Computer. Most auto parts stores can read the codes for you for free. They will point to the circuit or system with the problem, not necessarily the defective part.
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Monday, January 31st, 2011 AT 9:01 PM