Performance by cohort
2 year bands · 6,440 tests
Pass rate climbs 1.5 points across the cohorts — newer Transporter T30 H Line Tdi S A examples clear the test more reliably than the early cars.
Pass
87.3%
Fail
10.1%
PRS
2.6%
Avg mileage at test
46,184 mi
Pass
88.7%
Fail
9.1%
PRS
1.7%
Avg mileage at test
33,107 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.