Toyota Corolla - Problems, Statistics, and Analysis

Toyota Corolla owners have reported a total of 10,632 problems for their cars built in the 23 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 Toyota Corolla. The 2009 Toyota Corolla cars have the most problems reported (1,677 problems).

Table 1. Total number of problems by model year for Toyota Corolla

  Common problems of Toyota Corolla

The following chart shows the 29 most common problems for Toyota Corolla cars. The number one most common problem is related to the vehicle's air bags (3,934 problems). The second most common problem is related to the vehicle's steering (1,031 problems).

Table 2. Common problems of Toyota Corolla

Problem Category Number of Problems
  Air Bag
3,934
  Steering
1,031
  Vehicle Speed Control
992
  Engine And Engine Cooling
898
  Service Brakes
614
  Electrical System
558
  Power Train
374
  Equipment
315
  Structure
294
  Seat Belt
219
   
  Visibility
209
  Suspension
201
  Tire
151
  Gasoline Fuel System
144
  Exterior Lighting
122
  Unknown Or Other
110
  Electronic Stability Control
95
  Wheel
94
  Other Fuel System
90
  Seats
85
  Latches/locks/linkage
45
  Traction Control System
14
  Parking Brake
14
  Air Brake
11
  Child Seat
9
  Interior Lighting
5
  Diesel Fuel System
2
  Forward Collision Avoidance
1
  Lane Departure
1

  Compare Reliability Across Model Years Using PPMY Index

It would not be fair to compare the Toyota Corolla 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 Corolla 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 Toyota Corolla 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 Corolla Model Years

Corolla
Model Year
Problems Sales [1] Vehicle
Age
PPMY Index
  2017 93317,4801    
0.29
  2016 121400,4002    
0.15
  2015 167368,2053    
0.15
  2014 205333,7024    
0.15
  2013 193370,6855    
0.10
  2012 434194,8006    
0.37
  2011 632223,3697    
0.40
  2010 1,469478,3648    
0.38
  2009 1,677363,5159    
0.51
  2008 353170,35610    
0.21
  2007 901309,55011    
0.26
  2006 904340,79512    
0.22
  2005 899368,74413    
0.19
  2004 529272,30114    
0.14
  2003 801330,42015    
0.16
  2002 138147,98316    
0.06
  2001 161230,24617    
0.04
  2000 172187,99618    
0.05

  Number of Problems Reported During the First Year

Another way to measure the reliability across the model years of the Toyota Corolla is to use the total number of problems reported during the vehicle's first year in service, as shown in the Table 4.

Table 4. Number of problems in vehicle's; first service year

Model YearProblems Reported
  2018 Corolla
14
  2017 Corolla
60
  2016 Corolla
36
  2015 Corolla
73
  2014 Corolla
64
  2013 Corolla
47
  2012 Corolla
44
  2011 Corolla
89
  2010 Corolla
498
  2009 Corolla
354
  2008 Corolla
41
  2007 Corolla
64
  2006 Corolla
44
  2005 Corolla
46
  2004 Corolla
47
  2003 Corolla
86
  2002 Corolla
19
  2001 Corolla
24
  2000 Corolla
19
  1999 Corolla
23
  1998 Corolla
39
  1997 Corolla
19
  1996 Corolla
35


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