Quote Originally Posted by Peterlech View Post
Thought others could benefit from my find: It was a partially malfunctioning Oxygen Sensor. Usually when they fail, the system goes to full rich and the Check engine light comes on. In this case, unplugging the sensor stopped the pinging, so it was replaced. All is well. FYI, the original sensor went over 120K miles before acting up.
Did you get a code? I'm looking at similar sympton that resembles a bad sensor but I have no codes indicating a sensor BTW, last time a sensor failed on my 530it, it shut down the car entirely.

Woo