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Q:

yellow engine diagnostic light on emission valve exceeded on 2004 Dodge Sprinter 2500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Van is lacking power Can't drive over 68mph Is engine in emergency mode. we have had this issue with the turbo before
(2) Answers
Sorry, not enough information, Possibilities: bad transmission, Turbo, Catalityc Converter, Fuel injection system etc. refer to a Sprinter dealer for diagnostics
EGR valve was my problem. Poured a bottle of Cleandiesel (silver bottle) and then added some with each tank of fuel solved my problem. (too much soot)