Toyota Sienna - Problems, Statistics, and Analysis

Toyota Sienna owners have reported a total of 9,203 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 Sienna. The 2004 Toyota Sienna cars have the most problems reported (2,422 problems).

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

  Common problems of Toyota Sienna

The following chart shows the 28 most common problems for Toyota Sienna cars. The number one most common problem is related to the vehicle's structure (2,357 problems). The second most common problem is related to the vehicle's air bags (817 problems).

Table 2. Common problems of Toyota Sienna

Problem Category Number of Problems
  Structure
2,357
  Air Bag
817
  Latches/locks/linkage
739
  Equipment
654
  Electrical System
580
  Tire
466
  Engine And Engine Cooling
452
  Service Brakes
444
  Steering
418
  Power Train
398
   
  Vehicle Speed Control
383
  Seat Belt
314
  Wheel
203
  Unknown Or Other
191
  Visibility
163
  Electronic Stability Control
141
  Suspension
117
  Exterior Lighting
88
  Gasoline Fuel System
80
  Seats
79
  Other Fuel System
60
  Child Seat
20
  Air Brake
12
  Traction Control System
12
  Interior Lighting
10
  Parking Brake
3
  Back Over Prevention
1
  Diesel Fuel System
1

  Compare Reliability Across Model Years Using PPMY Index

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

Sienna
Model Year
Problems Sales [1] Vehicle
Age
PPMY Index
  2018 1210,0231    
1.20
  2017 59144,6242    
0.20
  2016 6480,4133    
0.27
  2015 156171,9304    
0.23
  2014 129125,2265    
0.21
  2013 139150,7356    
0.15
  2012 261111,1217    
0.34
  2011 667187,4678    
0.44
  2010 17654,8959    
0.36
  2009 23563,79710    
0.37
  2008 457129,20811    
0.32
  2007 39897,49112    
0.34
  2006 1,139200,89913    
0.44
  2005 1,281172,99914    
0.53
  2004 2,422220,31415    
0.73
  2003 11942,69116    
0.17
  2002 21285,41717    
0.15
  2001 23285,85118    
0.15
  2000 449131,40519    
0.18

  Number of Problems Reported During the First Year

Another way to measure the reliability across the model years of the Toyota Sienna 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 Sienna
12
  2017 Sienna
30
  2016 Sienna
35
  2015 Sienna
26
  2014 Sienna
20
  2013 Sienna
12
  2012 Sienna
21
  2011 Sienna
83
  2010 Sienna
35
  2009 Sienna
15
  2008 Sienna
26
  2007 Sienna
30
  2006 Sienna
42
  2005 Sienna
77
  2004 Sienna
178
  2003 Sienna
13
  2002 Sienna
15
  2001 Sienna
22
  2000 Sienna
79
  1999 Sienna
28
  1998 Sienna
53


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