"service engine soon" light, checked codes and had tank ventilation valve and Oxygen sensor errors. Cleared errors and ordered 4 new O2 sensors (about due with 90k on second set).
Error came back -but this time when I checked only "tank Ventilation valve" was present.
I did try re-setting gas tank cap after first Service engine soon light.

away from home and using most basic INAP program on my laptop.

Can a bad 02 sensor affect tank ventilation also or should I replace that too.

thanks!

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2004, X5, 3.0, 202k+