1984 Land Rover Defender — MOT failures & pass rate
The 1984 Land Rover Defender passed 78.4% of its 4,289 recorded MOT tests. Large SUVs of a similar age fail at 21.7%, so the 1984 Defender sits squarely on the average. Failures cluster in lighting & signalling, suspension and body, structure & corrosion.
What the MOT record shows
Lighting & signalling dominates the failure mix at 16.8% of all tests — 8.0 points clear of suspension, so it is the first thing to check.
At component level the recurring items are headlamp aim, position lamp and component mounting prescribed areas — headlamp aim alone was recorded 237 times.
Condition tracks the odometer closely. Failures run at 17.1% in the 0-30k band and 22.8% in the 150k+ band, a 5.6-point spread.
Fuel type barely separates them — diesel fails 21.4% of the time against 22.2% for petrol.
Advisories point at the next bill rather than this one: emissions & environmental was flagged on 27.4% of tests without failing them.
The trend is improving — the fail rate fell from 23.0% in 2021 to 18.9% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 16.8% | 719 |
| 2 | Suspension | 8.8% | 378 |
| 3 | Body, structure & corrosion | 8.5% | 363 |
| 4 | Brakes | 7.6% | 326 |
| 5 | Steering | 6.5% | 280 |
| 6 | Visibility | 6.1% | 263 |
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 | 237 |
| 2 | Position lamp | 234 |
| 3 | Component mounting prescribed areas | 231 |
| 4 | Rear fog lamp | 221 |
| 5 | Headlamp | 196 |
| 6 | Stop lamp | 180 |
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 | 27.4% | 1,173 |
| 2 | Suspension | 24.7% | 1,058 |
| 3 | Brakes | 17.2% | 736 |
| 4 | Steering | 16.1% | 689 |
| 5 | Body, structure & corrosion | 14.9% | 641 |
| 6 | Tyres | 9.2% | 396 |
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 | 251 | 17.1% |
| 30-60k | 288 | 18.4% |
| 60-90k | 540 | 22.6% |
| 90-120k | 862 | 21.7% |
| 120-150k | 741 | 21.2% |
| 150k+ | 1,595 | 22.8% |
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Diesel | 3,306 | 21.4% |
| Petrol | 980 | 22.2% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 1,001 | 23.0% |
| 2022 | 966 | 21.6% |
| 2023 | 959 | 22.4% |
| 2024 | 876 | 20.7% |
| 2025 | 487 | 18.9% |
What to check before buying a 1984 Defender
On a 1984 Defender, lighting & signalling is what the MOT record says goes wrong most — it appeared in 16.8% of tests. Check these areas before you commit.
- Lighting & signalling (16.8% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (8.8% 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.
- Body, structure & corrosion (8.5% 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+.
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 1984 Land Rover Defenders pass their MOT?
78.4% of the 4,289 1984 Land Rover Defender MOT tests in this dataset passed — a 21.6% fail rate.
What is the most common MOT failure on a 1984 Land Rover Defender?
Lighting & signalling, recorded in 16.8% of tests, followed by suspension (8.8%).
Does the 1984 Defender get worse with mileage?
Its MOT fail rate rises from 17.1% in the 0-30k band to 22.8% in the 150k+ band.
Methodology & source. Based on 4,289 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.