When my siphon tube o ring was going bad on the 2001 m54, I got similar codes. I believe the expert has been replying to this thread. Could that be a possibility here?

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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,