111 problems have been reported for the 2003 Lincoln LS. The following chart shows the 18 most common problems for 2003 Lincoln LS. The number one most common problem is related to the vehicle's power train with 20 problems. The second most common problem is related to the vehicle's engine and engine cooling (15 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 2003 Lincoln LS in the United States are 23,640 units [1]. If the total number of problems reported by Lincoln LS owners in the last 19 years is 111, and the age of the vehicle is 19, the PPMY index can then be calculated as
PPMY Index = 111 / 23,640 / 19 * 1000 = 0.25.
For more information, refer to this page: A study of reliability comparison across Lincoln LS model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2003 Lincoln LS in 2003.
| Service Year | Number of Problems |
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| 2003 |
When making the decision between buying a new or used Lincoln LS, the following table can be used to compare the 2003 Lincoln LS with the Lincoln LS from other model years. Note that the number of problems reported for the 2003 LS is 111 while the average number of problems reported for the 7 model years of the Lincoln LS is 191.