One problem related to engine shut off without warning 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.
After driving my Mustang approximately 1 to 1 1/2 hours at highway speeds, I exited the interstate. At the top of the ramp I attempted to merge into traffic but when I pushed the accelerator the car shut off right in the path of oncoming traffic. It did restart so I avoided being struck. Since then it has done it several times even while driving along then accelerating. I have had several close calls due to this problem. I have returned the car to the dealership on three different occasions. The first time, they replaced a O2 sensor. The last two times they said they can not find a problem.