2004 Audi A4 - Problems, Statistics, and Analysis

🔎 Common problems of the 2004 Audi A4

203 problems have been reported for the 2004 Audi A4. The following chart shows the 15 most common problems for 2004 Audi A4. The number one most common problem is related to the vehicle's fuel system, gasoline with 45 problems. The second most common problem is related to the vehicle's air bags (26 problems).

Table 1. Common problems of the 2004 Audi A4

Problem Category	Number of Problems
Gasoline Fuel System	45
Air Bag	26
Engine And Engine Cooling	22
Electrical System	15
Tire	15
Vehicle Speed Control	14
Visibility	13
Power Train	12
Exterior Lighting	12
Other Fuel System	10
Equipment	9
Service Brakes	4
Steering	3
Structure	2
Unknown Or Other	1

📈 PPMY Index and Problem Occurrence Trend

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 Audi A4 in the United States are 46,704 units [1]. If the total number of problems reported by Audi A4 owners in the last 19 years is 203, and the age of the vehicle is 19, the PPMY index can then be calculated as

PPMY Index = 203 / 46,704 / 19 * 1000 = 0.23.

For more information, refer to this page: A study of reliability comparison across Audi A4 model year vehicles.

The following chart shows the number of problems reported during each of the service years since the debut of the 2004 Audi A4 in 2004.

Table 2. PPMY Index and Problem Occurrence Trend

Service Year	Number of Problems
2023	1
2022	2
2021	4
2020	7
2019	1
2018	5
2017	1
2016	6
2015	5
2014	6
2013	5
2012	8
2011	11
2010	30
2009	30
2008	24
2007	15
2006	12
2005	5
2004	2

📊 Compare the 2004 Audi A4 with Other Model Years

When making the decision between buying a new or used Audi A4, the following table can be used to compare the 2004 Audi A4 with the Audi A4 from other model years. Note that the number of problems reported for the 2004 A4 is 203 while the average number of problems reported for the 28 model years of the Audi A4 is 119.

Table 3. Compare the 2004 Audi A4 with other model years

Model Year	Number of Problems
2023 A4	2
2022 A4	5
2021 A4	6
2020 A4	4
2019 A4	7
2018 A4	32
2017 A4	107
2016 A4	34
2015 A4	48
2014 A4	80
2013 A4	122
2012 A4	56
2011 A4	57
2010 A4	76
2009 A4	165
2008 A4	218
2007 A4	235
2006 A4	342
2005 A4	249
2004 A4	203
2003 A4	230
2002 A4	186
2001 A4	130
2000 A4	96
1999 A4	193
1998 A4	260
1997 A4	100
1996 A4	89

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★ Safety Ratings of A4 Cars

✿ Fuel Economy of A4 Vehicles

☘ A4 Service Bulletins

⚑ A4 Safety Recalls

☤ A4 Defect Investigations