One problem related to engine exhaust system has been reported for the 2003 Ford Mustang. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford Mustang based on all problems reported for the 2003 Mustang.
The exhaust pipe breaks where the a/c water drips. This is due to poor design of the car. This article describes it better. Https://Ford. Oemdtc. Com/100/exhaust-leak-cracked-or-separated-right-side-exhaust-pipe-1999-2004-Ford-mustang.