Look at the throttle body and see if it has a wire on it or not
However I've no idea why changing the steering wheel should mean you need to reset it.
Apparently if your engine code is APE, AXP, AUS or AXD it has drive by wire. Sticker with engine code should be in the boot on the floor. May be easier to check that way for you?
EPC is Electronic stability control http://en.wikipedia.org/wiki/Electronic_stability_control