One problem related to engine shut off without warning has been reported for the 2003 Subaru Outback. The most recently reported issues are listed below.
Car keeps shutting off in infrequent intervals. First at 375 miles and by 9000 miles it did it 9 times. The car has been at the dealer 6 times and just now Subaru is admitting to having other cars with this issue. All 2003 6 cylinder engines. I was told after the 4th time at the dealer that they cannot fix it, end of story. Then after filing a complaint with the attorney general office they are working on it again. They are now starting to replace stuff and want to put a black box in. This car shuts off only at a stand still so far but this is very dangerous. Subaru admits to having more cars like this and they only could fix half of them.