It sound like a belt driven accessory is failing, the check engine light is the variable. If it is the alternator, the light may come on due to a low voltage. It sounds like you may be unable, but if you could remove the belt and start the vehicle, see if the noise is still present. If it is not, spin one pulley at a time, to try and isolate the cause.
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Friday, January 13th, 2012 AT 4:42 AM