Toyota Sienna - Problems, Statistics, and Analysis

Toyota Sienna owners have reported a total of 9,415 problems for their cars built in the 24 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 (2,446 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 (2,383 problems). The second most common problem is related to the vehicle's air bags (834 problems).

Table 2. Common problems of Toyota Sienna

Problem Category Number of Problems
  Structure
2,383
  Air Bag
834
  Latches/locks/linkage
739
  Equipment
689
  Electrical System
595
  Tire
466
  Engine And Engine Cooling
459
  Service Brakes
456
  Steering
436
  Power Train
418
   
  Vehicle Speed Control
389
  Seat Belt
322
  Wheel
218
  Unknown Or Other
191
  Visibility
166
  Electronic Stability Control
155
  Suspension
124
  Exterior Lighting
88
  Seats
81
  Gasoline Fuel System
80
  Other Fuel System
64
  Child Seat
21
  Traction Control System
14
  Air Brake
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 1969,1781    
0.27
  2017 79144,6242    
0.27
  2016 7180,4133    
0.29
  2015 181171,9304    
0.26
  2014 145125,2265    
0.23
  2013 147129,6916    
0.19
  2012 275111,1217    
0.35
  2011 693187,4678    
0.46
  2010 18154,8959    
0.37
  2009 24163,79710    
0.38
  2008 472129,20811    
0.33
  2007 40097,49112    
0.34
  2006 1,157200,89913    
0.44
  2005 1,295172,99914    
0.53
  2004 2,446220,31415    
0.74
  2003 11942,69116    
0.17
  2002 21385,41717    
0.15
  2001 23285,85118    
0.15
  2000 450131,40519    
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
  2019 Sienna
2
  2018 Sienna
12
  2017 Sienna
33
  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
78
  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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