Data as of: DVSA MOT results to 2025
Ajs Firefox: MOT pass rate by registration year
Which Firefox years pass first time, and which fall short of the model's 69.4% average, from 1,537 DVSA tests.
Pass rate by registration year
Highest pass rate: 2019 (78.0% of 164 tests). Lowest: 2016 (64.7% of 167). Years more than two points below the model average: 2014, 2015, 2016, 2018.
| Registered | Tests | First-time pass | vs model (69.4%) |
|---|---|---|---|
| 2012 | 135 | 71.9% | +2.5 pp |
| 2013 | 105 | 73.3% | +3.9 pp |
| 2014 | 74 | 66.2% | -3.2 pp |
| 2015 | 142 | 64.8% | -4.6 pp |
| 2016 | 167 | 64.7% | -4.7 pp |
| 2017 | 249 | 71.9% | +2.5 pp |
| 2018 | 256 | 64.8% | -4.6 pp |
| 2019 | 164 | 78.0% | +8.6 pp |
| 2020 | 119 | 68.9% | -0.5 pp |
| 2021 | 66 | 68.2% | -1.2 pp |
| 2022 | 55 | 70.9% | +1.5 pp |
Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years. A first-time MOT pass is a roadworthiness check, not a full mechanical inspection.
Pass rate over time
Questions
- Which Firefox years have the lowest MOT pass rate?
- 2014, 2015, 2016, 2018 registered examples pass first time less often than the Ajs Firefox overall (69.4%); the 2016 cohort is lowest at 64.7% from 167 tests.
- Which Firefox year has the highest MOT pass rate?
- 2019, at 78.0% of 164 first tests (2005–2025). Years more than two points above the model average: 2012, 2013, 2017, 2019.
- How much does the Firefox pass rate vary by year?
- 13.3 percentage points between the highest (2019, 78.0%) and lowest (2016, 64.7%) cohorts with at least 50 tests. Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.
Full report: Ajs Firefox reliability, failures and mileage · ranked #4778 of 5428 models· other Ajs models: Modena, Modena 125, DD, DD 125 E 08, 16MS, Cadwell