I'm going by memory here, since I don't have an STi, but when the CEL comes on in the STi, the cruise light blinks also. It's kinda like a double warning. Resetting the ECU will remove the CEL from memory, but it probably will come back. Rather than doing the resistor fix for the CEL, which involves cutting and splicing wires (and I've heard sometimes it can "fail"), you can also do the mechanical fix, which pretty much works the same.