Toyota Sienta
Reliability, running costs, and MOT data across 6 years from 639 real MOT tests.
Avg Pass Rate
93%
Total Tests
639
Best Year
2018 (100%)
Years Covered
6
How reliable is the Toyota Sienta?
Toyota Sienta by Year
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About the Toyota Sienta
The Toyota Sienta has been tested 639 times in 2024 MOT data across 6 model years (2015 to 2020), with an average pass rate of 93%. That's comfortably above the national average of 82%, making it a reliable choice. Available as petrol and hybrid.
Best and Worst Years
The 2018 model is the most reliable with a 100% pass rate from 99 tests. The 2015 model has the lowest at 87%. The 13 point spread between years means reliability varies somewhat, but no year is dramatically different.
Reliability Trend
Newer TOYOTA SIENTAs show better MOT pass rates than older ones, with an average improvement of 11 percentage points.
Mileage Across Years
The oldest model in our data (2015) averages 54,156 miles, while the newest (2020) averages 40,657 miles.
Compared to the Toyota brand average of 84%, the Sienta performs 9 points better, making it one of the more reliable options in the Toyota range.
Click any year in the table above to see detailed running costs, individual reliability data, and comparisons with similar cars.