Porsche 911 - Problems, Statistics, and Analysis

Porsche 911 owners have reported a total of 92 problems for their cars built in the 17 model years listed in the chart below. The chart shows the number of problems reported across all service years for each given model year of the Porsche 911. The 2002 Porsche 911 cars have the most problems reported (11 problems).

Table 1. Total number of problems by model year for Porsche 911

Model Year Number of Problems
  2015 911
3
  2014 911
1
  2013 911
2
  2012 911
2
  2009 911
1
  2008 911
3
  2007 911
3
  2005 911
5
  2004 911
10
  2003 911
10
  2002 911
11
  2001 911
9
  2000 911
5
  1999 911
11
  1998 911
4
  1997 911
2
  1996 911
9

  Common problems of Porsche 911

The following chart shows the 16 most common problems for Porsche 911 cars. The number one most common problem is related to the vehicle's engine and engine cooling (35 problems). The second most common problem is related to the vehicle's equipment (12 problems).

Table 2. Common problems of Porsche 911

Problem Category Number of Problems
  Engine And Engine Cooling
35
  Equipment
12
  Electrical System
8
  Power Train
7
  Air Bag
7
  Exterior Lighting
4
  Structure
3
  Seat Belt
3
  Tire
2
  Wheel
2
   
  Steering
2
  Vehicle Speed Control
2
  Visibility
2
  Service Brakes
1
  Air Brake
1
  Seats
1

  Compare Reliability Across Model Years Using PPMY Index

It would not be fair to compare the Porsche 911 of an older model year to newer model years since older vehicles have been in service longer and thus are expected to have more problems. In order to compare the reliability across 911 model years, we use the PPMY index which is defined as the problems reported per thousand vehicles per Year. A smaller PPMY index indicates greater reliability of the given model year cars.

    PPMY = P / S / Y * 1000,

where P = total problems reported during the life of a Porsche 911 model year; S = total units sold of the model year; Y = years since the debut of the model year (the age of the vehicle).

The results are shown in Table 3.

Table 3. Use PPMY Index to Compare Reliability Across 911 Model Years

911
Model Year
Problems Sales [1] Vehicle
Age
PPMY Index
  2005 51,50813    
0.26
  2004 109,40514    
0.08
  2003 1010,04015    
0.07
  2002 1112,13216    
0.06
  2001 911,04517    
0.05
  2000 57,57818    
0.04
  1999 1112,98519    
0.04


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