One problem related to ignition has been reported for the 2005 Ford Mustang. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Ford Mustang based on all problems reported for the 2005 Mustang.
No crashes, speedometer eratic reading. Sometimes reads high, sometimes low, will not return to zero position. Sometimes sticks at the 40mph mark, can only be reset by turning the ignition off then on. Filed complaint with Ford, as well as here at urging of service writer at Ford dealer, who advised me that this is a well known problem.