1989 Ford Sierra Sapphire — MOT failures & pass rate
641 MOT tests on the 1989 Ford Sierra Sapphire are in this dataset, and 93.0% of them passed. That is 14.3 percentage points better than all cars of a similar age, which fail at 21.3%. Failures cluster in lighting & signalling, emissions & environmental and brakes.
What the MOT record shows
No single area dominates — lighting & signalling (3.3%) and emissions & environmental (2.5%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are component mounting prescribed areas, non catalyst emissions and headlamp — component mounting prescribed areas alone was recorded 12 times.
Mileage matters less than usual here: the 1989 Sierra Sapphire fails 6.2% of the time in the 0-30k band and 7.7% at 90-120k, a spread of only 1.5 points.
Advisories point at the next bill rather than this one: brakes was flagged on 8.1% of tests without failing them.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 3.3% | 21 |
| 2 | Emissions & environmental | 2.5% | 16 |
| 3 | Brakes | 1.9% | 12 |
| 4 | Suspension | 1.9% | 12 |
| 5 | Body, structure & corrosion | 1.1% | 7 |
| 6 | Tyres | 0.9% | 6 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Component mounting prescribed areas | 12 |
| 2 | Non catalyst emissions | 11 |
| 3 | Headlamp | 7 |
| 4 | Position lamp | 6 |
| 5 | Washers | 5 |
| 6 | Individual direction indicators | 5 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Brakes | 8.1% | 52 |
| 2 | Suspension | 7.5% | 48 |
| 3 | Emissions & environmental | 7.5% | 48 |
| 4 | Body, structure & corrosion | 5.3% | 34 |
| 5 | Tyres | 3.9% | 25 |
| 6 | Steering | 2.6% | 17 |
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 | 179 | 6.2% |
| 30-60k | 175 | 8.6% |
| 60-90k | 176 | 5.7% |
| 90-120k | 104 | 7.7% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 130 | 6.9% |
| 2022 | 139 | 5.8% |
| 2023 | 139 | 9.3% |
| 2024 | 116 | 6.9% |
| 2025 | 117 | 6.0% |
What to check before buying a 1989 Sierra Sapphire
On a 1989 Sierra Sapphire, lighting & signalling is what the MOT record says goes wrong most — it appeared in 3.3% of tests. Check these areas before you commit.
- Lighting & signalling (3.3% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Emissions & environmental (2.5% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
- Brakes (1.9% 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.
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 Ford Sierra Sapphires pass their MOT?
93.0% of the 641 1989 Ford Sierra Sapphire MOT tests in this dataset passed — a 7.0% fail rate.
What is the most common MOT failure on a 1989 Ford Sierra Sapphire?
Lighting & signalling, recorded in 3.3% of tests, followed by emissions & environmental (2.5%).
Does the 1989 Sierra Sapphire get worse with mileage?
Its MOT fail rate rises from 6.2% in the 0-30k band to 7.7% in the 90-120k band.
Methodology & source. Based on 641 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.