When I finally got a mechanic to check out the Forester today, the P122 stood out, and he said that until that was addressed, transmission diagnosis and work would be ineffective. I remember that I had pulled the sensor off the throttle body and put it back without examining alignment thinking that that was automatic. The mechanic saw the mark on the throttle body and mentioned that. After readjusting the sensor and aligning it properly, the Forester ran like a top.