Of the 12 Sienna model years with enough complaints to compare, owners filed the most about the 2011 (1.30) and the fewest about the 2014 (0.25), per 1,000 sold in the first three years.
Median across these years: 0.33 per 1,000 sold in the first three years. A model year well above its own nameplate’s median is the signal worth acting on.
Each model year with a verified denominator. Follow a year for what owners reported about it.
| Model year | Per 1,000 | Complaints | Most-reported part |
|---|---|---|---|
| 2011 | 1.30 | 136 | Air Bags 26% |
| 2023 | 0.76 | 52 | Service Brakes 31% |
| 2008 | 0.74 | 86 | Structure 21% |
| 2015 | 0.66 | 86 | Structure 21% |
| 2017 | 0.53 | 64 | Power Train 19% |
| 2010 | 0.50 | 46 | Structure 25% |
| 2012 | 0.34 | 39 | Air Bags 25% |
| 2018 | 0.33 | 33 | Power Train 24% |
| 2016 | 0.32 | 42 | Structure 28% |
| 2009 | 0.31 | 31 | Structure 36% |
| 2013 | 0.29 | 34 | Structure 20% |
| 2020 | 0.27 | 16 | Power Train 15% |
| 2014 | 0.25 | 31 | Structure 21% |
| 2019 | 0.22 | 18 | Power Train 14% |
| 2021 | 0.08 | 9 | Air Bags 22% |
| 2022 | 0.03 | 3 | Service Brakes 17% |
2011 (1.30), 2023 (0.76), 2008 (0.74). Figures are complaints per 1,000 sold.
2014 (0.25), 2013 (0.29), 2009 (0.31). A year with too few complaints to rank is left out: few reports is not the same as a good year.
Safety complaints owners filed with NHTSA in each model year’s first three years on the road, divided by how many were sold, so a year that sold twice as many cars is not penalised for it.
Too few owners filed complaints about them to rank them. Few reports is not the same as a good year, so those years are left out of best and worst.