Toyota Sienna - Problems, Statistics, and Analysis

Toyota Sienna owners have reported a total of 9,316 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 (2,440 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 (2,371 problems). The second most common problem is related to the vehicle's air bags (826 problems).

Table 2. Common problems of Toyota Sienna

Problem Category Number of Problems
  Structure
2,371
  Air Bag
826
  Latches/locks/linkage
739
  Equipment
673
  Electrical System
588
  Tire
466
  Engine And Engine Cooling
455
  Service Brakes
448
  Steering
427
  Power Train
411
   
  Vehicle Speed Control
385
  Seat Belt
318
  Wheel
212
  Unknown Or Other
191
  Visibility
163
  Electronic Stability Control
148
  Suspension
122
  Exterior Lighting
88
  Seats
81
  Gasoline Fuel System
80
  Other Fuel System
63
  Child Seat
21
  Traction Control System
13
  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 1610,0231    
1.60
  2017 68144,6242    
0.24
  2016 6680,4133    
0.27
  2015 172171,9304    
0.25
  2014 140125,2265    
0.22
  2013 143150,7356    
0.16
  2012 271111,1217    
0.35
  2011 681187,4678    
0.45
  2010 17954,8959    
0.36
  2009 23763,79710    
0.37
  2008 461129,20811    
0.32
  2007 39897,49112    
0.34
  2006 1,149200,89913    
0.44
  2005 1,286172,99914    
0.53
  2004 2,440220,31415    
0.74
  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
  2019 Sienna
1
  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
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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