One problem related to engine stall has been reported for the 2011 Subaru Legacy. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Subaru Legacy based on all problems reported for the 2011 Legacy.
Engine idle rpm is unstable. (+ / - 500 rpm) engine stalled many times (6 or 7) without reason and in dangerous situation as turning in the intersection or crossing rail roads, when stopping or slowing down. I went twice in Subaru service. At first they replaced the "torque converter" and proceeded with some adjustments in the engine. Second time they "re-programmed" the computer. As of today I am getting same issue without help from Subaru service. They advised to file a claim and eventually sue the company.