2006 Z4 3.0si. Whenever it try to check the oil level (thoroughly warm and parked or driving) the indicator bar just keeps scanning across for as long as I leave it, sometimes up to 5 minutes but never reports anything. Do I need a new sensor probe for the oil pan or something else. There are no error codes related to this with OBD scanner. I change my own oil but would like to have this work properly.