1991 Leyland Daf 400 Series Diesel — MOT History by Age
How cars manufactured in 1991 perform at MOT as they age
Data from official DVSA MOT testing records
Insufficient data for same-age comparison.
How This Car Ages
Pass rate progression for the 1991 Leyland Daf 400 Series Diesel as it ages.
Bar chart showing pass rate by car age from 18 to 22 years
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| Age | Pass Rate | Tests |
|---|---|---|
| 18 yrs | 33.0% | 112 |
| 19 yrs | 41.8% | 79 |
| 20 yrs | 44.4% | 72 |
| 21 yrs | 40.4% | 47 |
| 22 yrs | 45.2% | 31 |
Pass Rate Trend
How the 1991 Leyland Daf 400 Series Diesel pass rate changes as it ages, from first MOT to most recent.
Trend shows stable over 5 years
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| Built | Pass Rate | Tests |
|---|---|---|
| 2013 (22 yrs) | 45.2% | 31 |
| 2012 (21 yrs) | 40.4% | 47 |
| 2011 (20 yrs) | 44.4% | 72 |
| 2010 (19 yrs) | 41.8% | 79 |
| 2009 (18 yrs) | 33% | 112 |
Year-by-Year MOT Results
Common MOT Failures
Top failure categories across all test years for 1991 Leyland Daf 400 Series Diesel, with age trends.
How Failures Change With Age
Comparing failure rates between the youngest and oldest test years.
| Category | At Youngest | At Oldest | Change | Trend |
|---|---|---|---|---|
| Lamps, Reflectors and Electrical Equipment | 37.5% (18 yrs) | 83.9% (22 yrs) | +46.4%
| 🔴 ↑ |
| Brakes | 41.1% (18 yrs) | 87.1% (22 yrs) | +46.0%
| 🔴 ↑ |
| Suspension | 40.2% (18 yrs) | 61.3% (22 yrs) | +21.1%
| 🔴 ↑ |
| Steering | 26.8% (18 yrs) | 45.2% (22 yrs) | +18.4%
| 🔴 ↑ |
Other Manufacture Years
Looking for the best year to buy? See the full comparison on the Leyland Daf 400 Series Diesel page →
About This Data
This page shows how Leyland Daf 400 Series Diesel cars manufactured in 1991 perform at MOT as they age. Data spans from 2009 to 2013, covering 341 tests. Pass rates naturally decline with age as components wear.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.