Found two codes: E3/E4
AI search: The E3 and E4 Codes are adaptation codes. Any thing that that affects fuel/air mixture can set this code. The most likely source though is increased air not being measured by the maf.

Before scanning and search for codes, I look it over. I removed the air intake assembly for valve cover work. The air tube connection right after the MAF was not on good. The clamp was really loose. I fixed the connection and tighten the clamp. The BMW codes seem to line up with an air intake hose issue. I cleared the codes. I’ll post back after a few hundred miles of driving.

__________________
'06 X5 3.0i - bought @143,123 miles (12/26/20)