One problem related to engine failure has been reported for the 2003 Porsche 911. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Porsche 911 based on all problems reported for the 2003 911.
Vehicle's engine started to "rattle" at warm-up, then would go away, typical for an ims failure. Any longer wait may have resulted in complete engine failure.