Bsa D1 Reliability, MOT Pass Rate & Common Faults
Free Bsa D1 car check
Is the Bsa D1 reliable? We analysed 408 real MOT tests across 124 vehicles to find out.
Got a specific Bsa D1? Enter the reg for a free check:
The Bsa D1 is above average for reliability based on real UK MOT data. Common problems include headlamp at least one does not illuminate on dipped beam, stop lamp does not illuminate immediately a brake applies and headlamp at least one does not illuminate on main beam. Here's everything you need to know before buying a used Bsa D1.
Bsa D1 Number Plates
Number plates registered to a Bsa D1. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Bsa D1 MOT Pass Rate by Year
How likely is a Bsa D1 to pass its MOT? Here's the pass rate for each registration year, newest first.
Bsa D1 Problems — What Goes Wrong?
The most common reasons a Bsa D1 fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Bsa D1 Mileage — What's Normal?
How many miles does a typical Bsa D1 owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Bsa D1 MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Bsa D1 year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1952 | 56 | 87.5% | 3,293 | 25,794 | 33,058 |
How Long Does a Bsa D1 Last?
Based on 124 Bsa D1 vehicles on UK roads.
Bsa D1 Mileage Distribution
Total mileage recorded across all Bsa D1 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 D1
Based on MOT pass rates across all registration years with sufficient test data.
87.5% MOT pass rate from 56 tests
The best year to buy a used Bsa D1 is 1952, which has the highest MOT pass rate at 87.5% across 56 tests.
How Does the Bsa D1 Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Bsa D1 THIS CAR | 89.7% | 408 | 12,846 mi | 74 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 |
| Bajaj Chetak | 82.6% | 734 | 6,469 mi | 32 yrs |
Compared to the Bsa A10 (92.2% pass rate) and the Bsa Bantam (89.9% pass rate), the Bsa D1 trails behind on MOT reliability.
Found a Bsa D1 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 D1Should you buy a used Bsa D1?
The Bsa D1 has an overall MOT pass rate of 89.7% across 408 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 D1 are headlamp at least one does not illuminate on dipped beam (6 recorded failures), stop lamp does not illuminate immediately a brake applies (6), and headlamp at least one does not illuminate on main beam (5). 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 D1 owner drives around 69 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 D1 models stay on UK roads for around 74 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.