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2004 Blazer Service Engine Light comes on.
I have tried resetting the computer by disconnecting the ground lead to the battery. The light will go out for about three or four days, then will come back on, when starting the engine. Runs just fine, although mileage could be better. Has 110,000, no record of any wrecks or damage. The check engine light came on, found out gas cap had been left off when filling it up, reset, no problems since.