It is BLEND DOOR ACTUATOR that is faulty. This is a flap (or door) that changes the mixture of hot and cold air in the heating system for the car. If your heating or cooling is not operating properly then that is the reason. Sorry, but no idea how to fix it, but it just sounds as though it is an inconvenience rather than a must fix or the car will die situation.
SOURCE: what isthe fualt code b279a
could you confirm as OBD code sbegin with a P and have 4 numbers
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