Erased code and cleared adaptations with the BMW scan tool this time, code has not returned in 38 miles. Exhaust gaskets getting repaired at shop today, will see how long the light takes to return... any other thoughts on where to diagnose?

Drivability is fine, other than a low 16.5 mpg average. It should be closer to 18.5 in a healthy car I think. Other notes, when I removed the ICV the intake smelled strongly of gasoline, definitely rich.