Bsa B25 Reliability, MOT Pass Rate & Common Faults
Free Bsa B25 car check
Is the Bsa B25 reliable? We analysed 955 real MOT tests across 199 vehicles to find out.
Got a specific Bsa B25? Enter the reg for a free check:
The Bsa B25 is above average for reliability based on real UK MOT data. Common problems include stop lamp does not illuminate immediately a brake applies, direction indicators flashing less than 60 times a minute and steering headbearing has excessive free play. Here's everything you need to know before buying a used Bsa B25.
Bsa B25 Number Plates
Number plates registered to a Bsa B25. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Bsa B25 MOT Pass Rate by Year
How likely is a Bsa B25 to pass its MOT? Here's the pass rate for each registration year, newest first.
Bsa B25 Problems — What Goes Wrong?
The most common reasons a Bsa B25 fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Bsa B25 Mileage — What's Normal?
How many miles does a typical Bsa B25 owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Bsa B25 MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Bsa B25 year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1972 | 86 | 91.9% | 1,122 | 13,635 | 26,692 |
| 1971 | 158 | 89.2% | 1,956 | 9,798 | 17,934 |
| 1970 | 141 | 92.9% | 3,145 | 8,837 | 20,912 |
| 1969 | 151 | 90.7% | 2,206 | 15,483 | 20,208 |
| 1968 | 187 | 90.4% | 3,601 | 8,421 | 20,512 |
How Long Does a Bsa B25 Last?
Based on 199 Bsa B25 vehicles on UK roads.
Bsa B25 Mileage Distribution
Total mileage recorded across all Bsa B25 MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Bsa B25
Based on MOT pass rates across all registration years with sufficient test data.
92.9% MOT pass rate from 141 tests
89.2% MOT pass rate from 158 tests
The best year to buy a used Bsa B25 is 1970, which has the highest MOT pass rate at 92.9% across 141 tests. The 1971 model year has the lowest pass rate at 89.2% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Bsa B25 Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Bsa B25 THIS CAR | 89.9% | 955 | 9,006 mi | 58 yrs |
| Bsa A10 | 92.2% | 10,105 | 12,338 mi | 74 yrs |
| Bsa Bantam | 89.9% | 7,723 | 13,212 mi | 77 yrs |
| Bsa C15 | 90.2% | 6,096 | 14,541 mi | 67 yrs |
| Toyota Auris Icon D-4D | 94.9% | 572 | 63,866 mi | — yrs |
Compared to the Bsa A10 (92.2% pass rate) and the Bsa Bantam (89.9% pass rate), the Bsa B25 sits in the middle of the pack on MOT reliability.
Found a Bsa B25 you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Bsa B25Should you buy a used Bsa B25?
The Bsa B25 has an overall MOT pass rate of 89.9% across 955 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
The most common problems on the Bsa B25 are stop lamp does not illuminate immediately a brake applies (8 recorded failures), direction indicators flashing less than 60 times a minute (7), and steering headbearing has excessive free play (4). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
A typical Bsa B25 owner drives around 149 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Bsa B25 models stay on UK roads for around 58 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.