If you put a piece of tape on the top of the steering wheel when your wheels are perfectly straight, then steer to full lock right and back to full lock left. Then come back to center and is the piece of tape back at the top center? If you do it a few times while sitting or driving, does it come back to center each time? I've seen one or two of those not do this, and that will throw off ATU or really most steering wheel motors. Constantly having to chase since there is no "center" with the steering wheel to come back to