One problem related to blown head gasket has been reported for the 2003 Subaru Legacy. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Subaru Legacy based on all problems reported for the 2003 Legacy.
Both head gaskets blown on a 2003 Subaru Legacy with about 54,000 miles and regularly maintained by the dealer car just 6 weeks out of warranty.