It's amazing how much difference a scan tool that reads all the codes can make! I used to lead with the scan tool question but now take it for granted I guess especially with people that have been on the forum for a while. I have worn injectors and my M54 gets to -10 fuel trim where it turns on the CEL but no stalling issues. It would be nice to get an answer from the OP about the Siemens injectors though??

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)