Have you done any work on the car lately? Specifically involving removing any intake parts?
I had similar lean codes after reassembling post head gasket project and my situation resolved after finding vacuum leaks while doing a smoke test.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,