1991 Volvo 900 Series — MOT failures & pass rate
The 1991 Volvo 900 Series passed 78.2% of its 1,367 recorded MOT tests. All cars of a similar age fail at 22.4%, so the 1991 900 Series sits squarely on the average. Failures cluster in lighting & signalling, brakes and suspension.
What the MOT record shows
Lighting & signalling dominates the failure mix at 12.5% of all tests — 4.7 points clear of brakes, so it is the first thing to check.
At component level the recurring items are position lamp, component mounting prescribed areas and wipers — position lamp alone was recorded 59 times.
Mileage is the strongest signal on the record: 8.6% of 30-60k cars fail, rising to 23.0% once past 150k — 2.7× the risk.
Advisories point at the next bill rather than this one: suspension was flagged on 31.5% of tests without failing them.
The trend is improving — the fail rate fell from 24.7% in 2021 to 20.3% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 12.5% | 171 |
| 2 | Brakes | 7.8% | 107 |
| 3 | Suspension | 6.7% | 92 |
| 4 | Body, structure & corrosion | 6.6% | 90 |
| 5 | Visibility | 6.5% | 89 |
| 6 | Steering | 3.8% | 52 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Position lamp | 59 |
| 2 | Component mounting prescribed areas | 57 |
| 3 | Wipers | 57 |
| 4 | Service brake performance | 54 |
| 5 | Stop lamp | 50 |
| 6 | Exhaust system | 49 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Suspension | 31.5% | 431 |
| 2 | Brakes | 29.1% | 398 |
| 3 | Emissions & environmental | 22.7% | 310 |
| 4 | Tyres | 21.8% | 298 |
| 5 | Body, structure & corrosion | 19.7% | 269 |
| 6 | Other defects | 16.5% | 226 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 30-60k | 35 | 8.6% |
| 60-90k | 144 | 20.8% |
| 90-120k | 256 | 19.5% |
| 120-150k | 242 | 23.5% |
| 150k+ | 664 | 23.0% |
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 1,325 | 22.0% |
| Diesel | 42 | 16.7% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 340 | 24.7% |
| 2022 | 290 | 21.0% |
| 2023 | 275 | 18.9% |
| 2024 | 250 | 23.2% |
| 2025 | 212 | 20.3% |
What to check before buying a 1991 900 Series
On a 1991 900 Series, lighting & signalling is what the MOT record says goes wrong most — it appeared in 12.5% of tests. Check these areas before you commit.
- Lighting & signalling (12.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (7.8% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
- Suspension (6.7% of tests): Worn drop links, bushes, springs or shocks — listen for knocks over bumps and check for uneven tyre wear. Typical repair: £150–£450 per corner.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 1991 Volvo 900 Seriess pass their MOT?
78.2% of the 1,367 1991 Volvo 900 Series MOT tests in this dataset passed — a 21.8% fail rate.
What is the most common MOT failure on a 1991 Volvo 900 Series?
Lighting & signalling, recorded in 12.5% of tests, followed by brakes (7.8%).
Does the 1991 900 Series get worse with mileage?
Its MOT fail rate rises from 8.6% in the 30-60k band to 23.0% in the 150k+ band.
Methodology & source. Based on 1,367 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.