One problem related to engine shut off without warning has been reported for the 2015 Subaru Legacy. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Subaru Legacy based on all problems reported for the 2015 Legacy.
While driving, the car shut down. This occurred more than once. On the highway and on the local road. My mechanic replaced the negative battery terminal with sensor and replaced positive terminal.