At a Glance
The Mazda B-series 4th gen UF has 6 identified problems that occur more often than the UK average, with Brake performance below minimum being the most reported. Electrical is the most common MOT failure category. Based on 11K MOT tests from DVSA data.
Problems are patterns in the DVSA data that occur significantly more often on this model than the UK average — confirmed at 99% statistical confidence. Read how we calculate MOT pass rates and problems →
Below: the full MOT-data picture for the Mazda B-series 4th gen UF — MOT pass rate vs the UK average, common problems vs UK fleet patterns, the most likely MOT failures by frequency, fault occurrence by mileage band, and pass/fail trends. All numbers drawn from DVSA records.
Mazda B-series 4th gen UF MOT Pass Rate
Across 11K MOT tests from DVSA data, the Mazda B-series 4th gen UF (1985–1998) has a fail rate of 47.7%.
All-time UK average fail rate: 34.9%
Common Mazda B-series 4th gen UF Problems
Owner-submitted reports plus patterns we've identified across 559 million UK MOT tests. Each MOT-derived item below — whether tagged as a Problem, Wear & Tear or Consumable — shows up noticeably more often on this generation than across the UK fleet, which is why it's here. Owner reports are pinned to the top by default; use the sort and filter pills below to view a specific tier or change the order.
Brake performance below minimum
1,150
occurrences
Body corrosion or damage
697
occurrences
Fog lamp not working
637
occurrences
Suspension pins, bushes or ball joints worn
219
occurrences
Leaf spring broken or corroded
182
occurrences
Tell Us About Your Problem
Help other Mazda B-series 4th gen UF owners — report a problem and we'll add it to the database
Tell Us About Your Problem
Help other Mazda B-series 4th gen UF owners — report a problem and we'll add it to the database
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Problems by mileage
Common problems, MOT failures and advisories on the Mazda B-series 4th gen UF, grouped by the mileage they typically appear at.
338 distinct problems · 31,940 total occurrences in current filter
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Advisory items are MOT tester observations. Frequency can be influenced by driving style and usage patterns.
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Other Mazda B-series Generations
4th gen UF
1985–1998
7 problems
Current page
5th gen UN
1998–2006
61 problems
Frequently Asked Questions
What are the most common Mazda B-series 4th gen UF problems?
Based on DVSA MOT data for the Mazda B-series 4th gen UF (1985–1998), we have identified 6 common problems. The most frequently reported is "Brake performance below minimum". Electrical is the most common MOT failure category.
How reliable is the Mazda B-series 4th gen UF?
This generation has 11K MOT tests on record with a 47.7% fail rate. A fault is flagged as a "Common Problem" only when it occurs significantly more often on this model than the UK average, confirmed at 99% statistical confidence.
What commonly fails the MOT on a Mazda B-series 4th gen UF?
There are 143 distinct MOT failure types recorded for the 4th gen UF (1985–1998), grouped by the mileage these failures typically occur. See the Common MOT Failures section on this page.
Can I report a problem with my Mazda B-series 4th gen UF?
Yes — use the "Tell Us About Your Problem" form on this page. Your report helps other Mazda B-series owners spot problems early. All submissions are reviewed before being added to the public database.
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