2009 Cadillac STS - Problems, Statistics, and Analysis

Common problems of the 2009 Cadillac STS

18 problems have been reported for the 2009 Cadillac STS.
The following chart shows the 10 most common problems for 2009 Cadillac STS.
The number one most common problem is related to the vehicle's air bags
with 3 problems.
The second most common problem is related to the vehicle's service brakes, hydraulic
(3 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 2009 Cadillac STS in the United States are 7,239 units [1]. If the total number of problems reported by Cadillac STS owners in the last 10 years is 18, and the age of the vehicle is 10, the PPMY index can then be calculated as

The following chart shows the number of problems reported during each of the service
years since the debut of the 2009 Cadillac STS in 2009.

Table 2. PPMY Index and Problem Occurrence Trend

Service Year

Number of Problems

2019

0

2018

0

2017

6

2016

1

2015

5

2014

3

2013

0

2012

0

2011

0

2010

2

2009

1

Compare the 2009 Cadillac STS with Other Model Years

When making the decision between buying a new or used Cadillac STS,
the following table can be used to compare the 2009 Cadillac STS
with the Cadillac STS from other model years.
Note that the number of problems reported for the 2009 STS is 18
while the average number of problems reported for the 14 model years of the Cadillac STS is 37.

Table 3. Compare the 2009 Cadillac STS with other model years