tedromanto Posted September 21, 2014 Report Share Posted September 21, 2014 Check engine light came on after fueling vehicle today. Have never had any significant problems with this vehicle (57K miles). OBD scan reveals P219A, Air Fuel Ratio Imbalance. Google searches (already) on this specific error code don't yield much of use, other than a laundry list of what it might be. Has anyone else had this code with their C-Max, and if yes, what specific dealer service was done to correct? (After reading some of the other threads, saw where the fuel door and inlet sensors could cause CEL errors, so tried that. Also tried the 3 trip/cold start, which I saw had caused a reset of the CEL in some cases.) Ford dealer open tomorrow, but obviously, closed on Sunday. Always good to have a second *useful* opinion. Quote Link to comment Share on other sites More sharing options...
ptjones Posted September 21, 2014 Report Share Posted September 21, 2014 Just curious have you changed the airfilter? Have you tried injector cleaner? I tried Techron injector cleaner at around 65K and MPG's went down a couple for the tank, but went up a couple better on the next. tank. :) Paul Quote Link to comment Share on other sites More sharing options...
RobMax Posted September 26, 2014 Report Share Posted September 26, 2014 I've read on Mustang forums where the code can be triggered by the ethanol content in the gas, which is actually federally mandated to be reduced during winter months in cold climates. It could also be something as simple as a bad O2 sensor. Update us on what the issue was so we'll all know what to look for. Quote Link to comment Share on other sites More sharing options...
J1983mw Posted April 20, 2021 Report Share Posted April 20, 2021 What did the issue wind up being? Quote Link to comment Share on other sites More sharing options...
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