Inlet Air Box Housing Snow Flap Replacement & Oxygen Sensor Inspection/Replacement. The snow flap in the inlet air box housing may remain partially to fully open. Should this occur, excess warm air could enter the air intake through the snow flap inlet.
The oxygen sensor will be checked during this service and, if measured degradation tolerances are met, the sensor will be replaced. Updated measuring value range for Heated Oxygen Sensor -G39- replacement in work procedure.