Performance by cohort
2 year bands · 2,924 tests
Pass rate drops 3.2 points across the cohorts — recent X1 Xdrive25e M Sport Auto examples are doing worse than the early cars at the same tested age.
Pass
93.8%
Fail
5.2%
PRS
0.9%
Avg mileage at test
36,665 mi
Pass
90.5%
Fail
7.8%
PRS
1.3%
Avg mileage at test
35,278 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.