See the many posts on this subject in "WRX Check Engine Light Log". In particular code#1443.
It seems that, depending on the dealer, some WRX owners are getting blown off completely while others are getting free loaner vehicles while their ECU is sent to be 'reprogrammed'. My dealer has been good so far but claims there is "no problem" as far as SOA is concerned and no Tech Bulletin. I've had two 1443 CEL's so far and the only work that's been done (other than resetting the CEL) was to clean the Vent Control Solenoid connector and pack it with grease.
WHAT's UP? Is this one of those "hidden recalls". Is there a problem or not?