I get the code 538, description "Insufficient RPM change during KOER Dynamic Response Test." What does this mean? Should I fix it? how? It is a 1994 Ford, 7.5 liter gas engine in an RV, 44,000 miles. 538 is the only code, I checked 3 times, always came up with 538. Thanks


(This post was edited by TBoy on Aug 22, 2008, 9:21 PM)

That code in not important. All it means is the accelerator was not pushed all the way to the floor during the "goose" portion of the engine running test.


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Thanks for the information, much appreciated