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Message: <blockquote data-quote="Rosemary" data-source="post: 2536205" data-attributes="member: 123399">after i tighten the alternator belt shortly after that the picture of the engine light came on..still been on for over a month now..checked wiring, fuel filter,air filter,egr valve,changed oil,checked alternator..is good.went on a website that told me for the codes, but cant find the box of wires it was talking about coming outta firewall on passenger side and hook up the green wire.to ground..all i seen close to it was a black box with fins ..buncha wires , but green one hooked up to ground.anyone know how i can get the light on dash to blink to give me the codes to tell me which sensor it is? only thing i can think of whats left/wrongtruck has 200000 miles on it</blockquote>