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Not too big a deal, but it will disable the high idle on cold days. What did you do with that little gray sensor in the old factory air box when you put the AFE in? If you've got the sensor plugged into the side of the AFE box, unplug it, clean the connector and plug it back in to see if that fixes it.
Try some electrical contact cleaner instead. Rubber parts and wires don't always react too kindly to brake cleaner. It comes in a spray can in the same area the parts stores have the brake and carb cleaner.
P0603 is a common code with a chip or tuner installed. Just ignore that one.
I actually was getting the same code a few days ago and I now that it's cold I noticed my High Idle quit working. Purchased a new sensor for 12 bucks I think.
ok yea i'll have to see cause i dont think i ever did notice a high idle, now i did notice the ebpv closing but idk if i noticed the high idle, and thats not a dealer item right??? like i i can get it at napa, or advancded??