At 150,000 miles, my Subaru Legacy developed a problem with the radio. Depending on my luck, the radio might or might not turn on. Eventually, the radio stopped working altogether, instead making a loud feedback type of noise. Subaru maintenance crew told me that the issue was electrical in nature and would cost upwards of $600 to repair.
2004 Subaru Legacy Problem Reports
Newest 2004 Subaru Legacy Problem Reports
My Subaru Legacy experienced three blown wheel bearings. Each time, the car would develop a droning noise, which would get progressively louder with continued driving. A fourth was in the works when my engine blew due to a leaking head gasket. Each wheel bearing cost $450 to replace.
The front oxygen (air fuel ratio) sensor element may develop a crack, causing the Check Engine Light to illuminate. Subaru has recalled certain models to replace sensors that may fail. The Subaru service program number is WXW-80, this is not a government mandated recall.