One problem related to engine has been reported for the 2011 Subaru Impreza. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Subaru Impreza based on all problems reported for the 2011 Impreza.
The car is a 2011 Subaru wrx sti. As far as I can tell nothing led up to the failure. It was fine one day, then failed the next. The failure was broken piston ring lands on the #2 and #4 pistons in the engine. The consequences were that I needed to replace the short block of the engine along with all associated parts like new pistons. Subaru replaced the short block and all associated parts under warranty, including new pistons and rings.