RyanG Posted September 24, 2016 Share Posted September 24, 2016 Have a 14 f450 box truck in for check engine light. CMDTC p2201, p2073 and p04DB stored. Threw in a oil separator for the failed ccv sensor and new air filter for the p2073(dirty aftermarket air filter with the maf sensor clip jammed between the lid and lower box). Drove and retest, everything ok except every time I run koer test it throws a p2457 cooler performance. Runs ok and has good power, passes pinpoint test az. Pulled egr pipe and cooler is nice and clean, does not set a p0401 in continuous memory. Anybody run in to this one yet? Egr valve? Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted September 25, 2016 Share Posted September 25, 2016 Bypass door broken? Quote Link to comment Share on other sites More sharing options...
RyanG Posted September 26, 2016 Author Share Posted September 26, 2016 Pulled it off already, didn't see anything obvious, moves freely, not a lot of soot build up. Reminds me of the P2263 code on the 6.4. Quote Link to comment Share on other sites More sharing options...
lmorris Posted September 26, 2016 Share Posted September 26, 2016 I've had a couple that set P2457 KOER with no issues. Same as you, no P0401, cooler clean, no CEL. I let them go. Never came back for anything EGR related. Quote Link to comment Share on other sites More sharing options...
RyanG Posted September 27, 2016 Author Share Posted September 27, 2016 I drove it a couple more times just to see if any problems came up, all was good and shipped it. Quote Link to comment Share on other sites More sharing options...
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