1989 Lancia Delta — MOT failures & pass rate
The 1989 Lancia Delta passed 83.5% of its 291 recorded MOT tests. Against all cars of a similar age (21.2% fail rate), the 1989 Delta comes out 4.7pp better. Failures cluster in lighting & signalling, brakes and suspension.
What the MOT record shows
Lighting & signalling dominates the failure mix at 11.7% of all tests — 5.8 points clear of brakes, so it is the first thing to check.
At component level the recurring items are headlamp aim, headlamp and component mounting prescribed areas — headlamp aim alone was recorded 23 times.
Condition tracks the odometer closely. Failures run at 8.8% in the 0-30k band and 17.1% in the 120-150k band, a 8.2-point spread.
Advisories point at the next bill rather than this one: suspension was flagged on 18.2% of tests without failing them.
The trend is improving — the fail rate fell from 26.5% in 2021 to 15.4% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 11.7% | 34 |
| 2 | Brakes | 5.8% | 17 |
| 3 | Suspension | 5.1% | 15 |
| 4 | Body, structure & corrosion | 4.1% | 12 |
| 5 | Emissions & environmental | 3.8% | 11 |
| 6 | Visibility | 3.4% | 10 |
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 | 23 |
| 2 | Headlamp | 22 |
| 3 | Component mounting prescribed areas | 12 |
| 4 | Position lamp | 10 |
| 5 | Non catalyst emissions | 10 |
| 6 | Washers | 9 |
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 | 18.2% | 53 |
| 2 | Emissions & environmental | 15.1% | 44 |
| 3 | Tyres | 10.0% | 29 |
| 4 | Brakes | 8.3% | 24 |
| 5 | Lighting & signalling | 5.8% | 17 |
| 6 | Body, structure & corrosion | 4.1% | 12 |
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 | 34 | 8.8% |
| 30-60k | 33 | 12.1% |
| 60-90k | 77 | 14.3% |
| 90-120k | 72 | 23.6% |
| 120-150k | 41 | 17.1% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 49 | 26.5% |
| 2022 | 58 | 15.5% |
| 2023 | 60 | 13.3% |
| 2024 | 59 | 13.6% |
| 2025 | 65 | 15.4% |
What to check before buying a 1989 Delta
On a 1989 Delta, lighting & signalling is what the MOT record says goes wrong most — it appeared in 11.7% of tests. Check these areas before you commit.
- Lighting & signalling (11.7% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (5.8% 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 (5.1% 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 1989 Lancia Deltas pass their MOT?
83.5% of the 291 1989 Lancia Delta MOT tests in this dataset passed — a 16.5% fail rate.
What is the most common MOT failure on a 1989 Lancia Delta?
Lighting & signalling, recorded in 11.7% of tests, followed by brakes (5.8%).
Does the 1989 Delta get worse with mileage?
Its MOT fail rate rises from 8.8% in the 0-30k band to 17.1% in the 120-150k band.
Methodology & source. Based on 291 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.