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2002 mack


What is a 6-1blink code on a 2002 ch612 mack. It was red x with a circle and the lightning bolt. Got rid of the red x but blink code 6-1 still on 

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Should be on the top of the driver side fuel tank. Either the sending unit is bad or the wires from the sending unit to VECU Vechical  Control Unit are broken which can be a pain to find

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