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This truck is failing nox at 15 and 25 [...] and co are [...] a 3/4 ton with a gvw of [...] a oc cat so nox is mainly controled by the egr valve.

It passes KOEO and [...] codes [...] preforming KOER The egr recieves just 2 or 3 inchs of [...] evp voltag...

FIX posted 12/15/2010

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