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if the service enginbe light is on,there is something wrong with the truck,you will need an obd2 scanner to scan the trucks computer to get the codes,these codes will give a clue to the problem,if the repairs have already been done,you will need to use the obd2 scanner to clear the codes to turn off the service engine light.if the truck still has a problem,the service engine light will come back on after you clear it
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