my engine failed. now what? The first step is to get to the bottom of why it occurred in the first place. Were you making too much power? Did you let the car run out of oil or neglect to change it for too long? Did you have a less than perfect tune and were experiencing detonation? Did you lose compression in a cylinder from ringland failure or broken rings (also form detonation)? Did you lose a bearing from a drop in oil pressure or detonation? All of the above factors are typical causes of Subaru Engine failures.