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Check engine light is on

My 01 f350 diesel is reading codes PO676 and PO683. I changed #6glowplug and relay. I reset the computer. The light on back on with PO676 code. How can I fix this.

Try this site and use the search DTC P0676 and DTC P0683. There seems to be some knowledgeable posting there.

thank you, I will try this.