251 problems have been reported for the 1999 Ford Mustang. The following chart shows the 19 most common problems for 1999 Ford Mustang. The number one most common problem is related to the vehicle's engine and engine cooling with 54 problems. The second most common problem is related to the vehicle's air bags (33 problems).
The following chart shows the number of problems reported during each of the service years since the debut of the 1999 Ford Mustang in 1999.
| Service Year | Number of Problems |
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| 2022 | |
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| 1999 |
When making the decision between buying a new or used Ford Mustang, the following table can be used to compare the 1999 Ford Mustang with the Ford Mustang from other model years. Note that the number of problems reported for the 1999 Mustang is 251 while the average number of problems reported for the 26 model years of the Ford Mustang is 305.