1986 Land Rover Defender — MOT failures & pass rate
Across 9,850 MOT tests, the 1986 Land Rover Defender recorded a 76.2% pass rate. Large SUVs of a similar age fail at 23.0%, so the 1986 Defender sits squarely on the average. Failures cluster in lighting & signalling, body, structure & corrosion and suspension.
What the MOT record shows
Lighting & signalling dominates the failure mix at 18.4% of all tests — 9.1 points clear of body, structure & corrosion, so it is the first thing to check.
At component level the recurring items are headlamp aim, position lamp and headlamp — headlamp aim alone was recorded 646 times.
Condition tracks the odometer closely. Failures run at 19.5% in the 0-30k band and 24.3% in the 150k+ band, a 4.8-point spread.
Fuel type barely separates them — petrol fails 23.8% of the time against 23.8% for diesel.
Advisories point at the next bill rather than this one: emissions & environmental was flagged on 28.8% of tests without failing them.
The trend is improving — the fail rate fell from 24.6% in 2021 to 23.0% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 18.4% | 1,813 |
| 2 | Body, structure & corrosion | 9.3% | 916 |
| 3 | Suspension | 8.1% | 802 |
| 4 | Brakes | 8.0% | 787 |
| 5 | Steering | 7.0% | 694 |
| 6 | Visibility | 6.4% | 633 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 646 |
| 2 | Position lamp | 618 |
| 3 | Headlamp | 455 |
| 4 | Chassis condition | 455 |
| 5 | Rear fog lamp | 433 |
| 6 | Stop lamp | 417 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Emissions & environmental | 28.8% | 2,837 |
| 2 | Suspension | 26.0% | 2,562 |
| 3 | Brakes | 19.4% | 1,908 |
| 4 | Body, structure & corrosion | 18.0% | 1,770 |
| 5 | Steering | 17.9% | 1,762 |
| 6 | Tyres | 11.2% | 1,107 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 539 | 19.5% |
| 30-60k | 493 | 22.3% |
| 60-90k | 1,094 | 23.9% |
| 90-120k | 1,901 | 23.8% |
| 120-150k | 2,141 | 24.1% |
| 150k+ | 3,668 | 24.3% |
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Diesel | 8,415 | 23.8% |
| Petrol | 1,422 | 23.8% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 1,627 | 24.6% |
| 2022 | 2,194 | 24.3% |
| 2023 | 2,117 | 23.5% |
| 2024 | 1,996 | 23.6% |
| 2025 | 1,916 | 23.0% |
What to check before buying a 1986 Defender
On a 1986 Defender, lighting & signalling is what the MOT record says goes wrong most — it appeared in 18.4% of tests. Check these areas before you commit.
- Lighting & signalling (18.4% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Body, structure & corrosion (9.3% of tests): The one to take seriously on older cars — corrosion to structural areas can be costly and is an MOT failure. Typical repair: £200–£1,500+.
- Suspension (8.1% 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 1986 Land Rover Defenders pass their MOT?
76.2% of the 9,850 1986 Land Rover Defender MOT tests in this dataset passed — a 23.8% fail rate.
What is the most common MOT failure on a 1986 Land Rover Defender?
Lighting & signalling, recorded in 18.4% of tests, followed by body, structure & corrosion (9.3%).
Does the 1986 Defender get worse with mileage?
Its MOT fail rate rises from 19.5% in the 0-30k band to 24.3% in the 150k+ band.
Methodology & source. Based on 9,850 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.