Skip to content

Toyota Sienta vs Toyota Yaris: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Toyota Sienta
85%
MOT pass rate · 455 vehicles
More reliable
Toyota Yaris
78%
MOT pass rate · 631,425 vehicles
Verdict: On MOT pass rate, the Toyota Sienta is the more reliable of the two — 85% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Head to head

Measure Toyota Sienta Toyota Yaris
MOT pass rate 85% ✓ 78%
MOT failure rate 15% ✓ 22%
Faults & advisories per test 1.1 ✓ 1.7
Dangerous-fault share 3% 2% ✓
Average mileage 73,414 mi 85,387 mi
Sample size (vehicles) 455 631,425

Most common faults

Toyota Sienta

  1. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Offside Rear Axle swivel pins and bushes swivel pin and/or bush slightly worn (5.1.2 (b) (i))
  4. Nearside Rear Axle swivel pins and bushes swivel pin and/or bush slightly worn (5.1.2 (b) (i))
  5. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))

Toyota Yaris

  1. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  2. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  4. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  6. Nearside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))

Reliability FAQ

On MOT pass rate, the Toyota Sienta is the more reliable of the two — 85% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Full Toyota Sienta report Full Toyota Yaris report Most reliable cars

Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.