Yeah 80 PSI fuel pressure is a problem! Possibly a restriction in the jet pump, any history with that ?? You sure about the 80 PSI ? That should be swinging the fuel trims far enough to set a code.

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