BMW Questions? Ask a BMW Repair Expert for Answers.
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P0101 is a code for a failed mass airflow sensor, which would cause a rich running condition. I would suggestyou replace your mass airflow sensor.
as for transmission failsafe, this can be caused by a failed airflow sensor, but could also be entirely unrelated - the warning only means a transmission-impacted fault has been sensed. If the failsafe issue does not resolve with a new airflow sensor, a BMW scan tool (not a p code reader) will need to be used to read the faults from the transmission.
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that would have been relevant information to have been provided with
I will open your question to other experts