Watch First Before Changing a Mercedes Sprinter Giving a Bad Glow Plug Code
Channel: O Jacks Do It Yourself
Date: 2018-01-19

Check this video out  Fix for Mercedes Sprinter code PO671 PO672 PO673 PO674 PO675 PO676 bad glow plug if it's testing good.
Includes Dodge and other Sprinter vans
And another thing first check to be sure your battery is putting out 12 volts because 
 At startup the glow plug module needs 12 volts. 
UPDATED
 I DID HAVE TO CHANGE MY NUMBER 5 GLOW AFTER REPLACING THE MODULE ALL IS GOOD NOW NO MORE PROBLEMS 

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