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Message: [QUOTE="Powerstroke Man 6.4, post: 963047, member: 4573"] to me its sounds like a P0088 HPFP death code on the 6.4 but how knows. I got this from another site "Do as H&S Support has suggested and put the stock air box back on. If that does not help, please have a dealer look at your fuel system. The P228F diagnostic is thrown when your fuel regulator valve has exceeded its learning limits. This valve controls total fuel flow into your high pressure fuel pump. Depending on how much fuel this valve lets into the pump, is how much pressure your truck will have. This valve is allowed to "learn" itself when parameters become slightly out of range. Your truck has become too far out of range from the desired valve duty cycle, and thus has triggered this diagnostic code. This could be caused by a bad valve, bad fuel, stuck fuel relief valve, etc. Good luck with it!" [/QUOTE]

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