997 problems have been reported for the 2005 Ford Mustang. The following chart shows the 22 most common problems for 2005 Ford Mustang. The number one most common problem is related to the vehicle's air bags with 284 problems. The second most common problem is related to the vehicle's electrical system (250 problems).
In our research we use the PPMY index to compare the reliability of vehicles. The PPMY index of a certain model is defined as the problems reported per thousand vehicles per Year. The total sales of the 2005 Ford Mustang in the United States are 146,298 units [1]. If the total number of problems reported by Ford Mustang owners in the last 20 years is 997, and the age of the vehicle is 20, the PPMY index can then be calculated as
PPMY Index = 997 / 146,298 / 20 * 1000 = 0.34.
For more information, refer to this page: A study of reliability comparison across Ford Mustang model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2005 Ford Mustang in 2005.
| Service Year | Number of Problems |
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| 2025 | |
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| 2005 |
When making the decision between buying a new or used Ford Mustang, the following table can be used to compare the 2005 Ford Mustang with the Ford Mustang from other model years. Note that the number of problems reported for the 2005 Mustang is 997 while the average number of problems reported for the 30 model years of the Ford Mustang is 305.