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Well, I have discovered something when using the VAFC and o2 simulator together. This will only apply to the people who have the o2 sim hooked up directly to the ECU as do I. When hooking up the VAFC, you have the two ground wires that have to be connected in a certain sequence ( the brown wire has to be connected closer to the ecu, then you hook up the black wire). If you have the o2 sim ground wire hooked up on the ground wire of the ecu, it causes the two grounds from the VAFC to tell the ECU there is a prob. and the light comes on. Simply disconnect the ground wire from the o2 sim and find a place to ground it by itself. You don't have to worry about the other o2 sim wires that are connected to the ecu, they seem to be fine. I hope this isn't too confusing and I also hope this helps some of you out.