2004 Chevrolet Impala - Problems, Statistics, and Analysis

Common problems of the 2004 Chevrolet Impala

1,210 problems have been reported for the 2004 Chevrolet Impala.
The following chart shows the 24 most common problems for 2004 Chevrolet Impala.
The number one most common problem is related to the vehicle's electrical system
with 648 problems.
The second most common problem is related to the vehicle's exterior lighting
(92 problems).

Table 1. Common problems of the 2004 Chevrolet Impala

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 2004 Chevrolet Impala in the United States are 279,789 units [1]. If the total number of problems reported by Chevrolet Impala owners in the last 15 years is 1210, and the age of the vehicle is 15, 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 2004 Chevrolet Impala in 2004.

Table 2. PPMY Index and Problem Occurrence Trend

Service Year

Number of Problems

2019

0

2018

5

2017

30

2016

31

2015

83

2014

128

2013

78

2012

62

2011

69

2010

118

2009

146

2008

181

2007

139

2006

65

2005

36

2004

2

Compare the 2004 Chevrolet Impala with Other Model Years

When making the decision between buying a new or used Chevrolet Impala,
the following table can be used to compare the 2004 Chevrolet Impala
with the Chevrolet Impala from other model years.
Note that the number of problems reported for the 2004 Impala is 1,210
while the average number of problems reported for the 23 model years of the Chevrolet Impala is 499.

Table 3. Compare the 2004 Chevrolet Impala with other model years