One problem related to tail light 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.
Design of taillights for new Ford Mustangs is unsafe. Direct midday sunlight causes taillights to appear lit when they are not. There is not enough of a difference between brakes-on and brakes-off appearance of taillights when in direct sunlight between mid-morning and late-afternoon.