1988 Ford Sierra Sapphire — MOT failures & pass rate
The 1988 Ford Sierra Sapphire passed 95.1% of its 329 recorded MOT tests. All cars of a similar age fail 20.9% of the time, so this is 16.0pp better than the group it competes with. Failures cluster in lighting & signalling, brakes and suspension.
What the MOT record shows
No single area dominates — lighting & signalling (3.3%) and brakes (2.4%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are service brake performance, parking brake performance and flexible brake hoses — service brake performance alone was recorded 8 times.
Mileage is the strongest signal on the record: 4.1% of 0-30k cars fail, rising to 8.3% once past 90-120k — 2.0× the risk.
The trend is improving — the fail rate fell from 6.3% in 2021 to 3.5% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 3.3% | 11 |
| 2 | Brakes | 2.4% | 8 |
| 3 | Suspension | 1.8% | 6 |
| 4 | Steering | 1.2% | 4 |
| 5 | Visibility | 1.2% | 4 |
| 6 | Body, structure & corrosion | 0.9% | 3 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Service brake performance | 8 |
| 2 | Parking brake performance | 5 |
| 3 | Flexible brake hoses | 4 |
| 4 | Rbt (sp) | 4 |
| 5 | Position lamp | 4 |
| 6 | Attachment | 3 |
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 | 6.1% | 20 |
| 2 | Body, structure & corrosion | 5.2% | 17 |
| 3 | Emissions & environmental | 4.9% | 16 |
| 4 | Suspension | 4.0% | 13 |
| 5 | Other defects | 3.6% | 12 |
| 6 | Tyres | 3.3% | 11 |
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 | 97 | 4.1% |
| 30-60k | 74 | 1.4% |
| 60-90k | 115 | 7.0% |
| 90-120k | 36 | 8.3% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 63 | 6.3% |
| 2022 | 81 | 7.4% |
| 2023 | 71 | 2.8% |
| 2024 | 57 | 3.5% |
| 2025 | 57 | 3.5% |
What to check before buying a 1988 Sierra Sapphire
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 3.3% of tests. Start there.
- 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.
- Brakes (2.4% 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 (1.8% 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.
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 1988 Ford Sierra Sapphires pass their MOT?
95.1% of the 329 1988 Ford Sierra Sapphire MOT tests in this dataset passed — a 4.9% fail rate.
What is the most common MOT failure on a 1988 Ford Sierra Sapphire?
Lighting & signalling, recorded in 3.3% of tests, followed by brakes (2.4%).
Does the 1988 Sierra Sapphire get worse with mileage?
Its MOT fail rate rises from 4.1% in the 0-30k band to 8.3% in the 90-120k band.
Methodology & source. Based on 329 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.