Subaru  is recalling 100,127 model year 2007-2009 model year Legacys and Outbacks, 2008-2014 Imprezas and 2009-2013 Forester vehicles, all equipped with turbo-charged engines. The relay that controls the secondary air injection pump may fail, causing the pump to operate continuously and overheat. If the air injection pump overheats, it may melt and increase the risk of a fire. Subaru will notify owners, and dealers will replace the secondary air injection pump relay, free of charge. The manufacturer has not yet provided a notification schedule. Owners may contact Subaru customer service at 1-800-782-2783. Subaru's number for this recall is WTM-73.