Performance by cohort
2 year bands · 3,528 tests
Pass rate climbs 3.9 points across the cohorts — newer Corsa SE Premium Turbo examples clear the test more reliably than the early cars.
Pass
84.4%
Fail
11.0%
PRS
4.3%
Avg mileage at test
26,210 mi
Pass
88.3%
Fail
7.6%
PRS
3.7%
Avg mileage at test
22,017 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.