Ford Sierra Sapphire MOT pass rate & common failures
Across 37 model years and 2,209 tests, the Ford Sierra Sapphire passes its MOT 92.4% of the time. That is 14.1 percentage points better than all cars of a similar age, which fail at 21.8%. Its most common failure areas are lighting & signalling, brakes and suspension.
What the MOT record shows
No single area dominates — lighting & signalling (4.5%) and brakes (2.5%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are non catalyst emissions, headlamp and headlamp aim — non catalyst emissions alone was recorded 40 times.
Mileage matters less than usual here: the Sierra Sapphire fails 7.0% of the time in the 0-30k band and 9.2% at 90-120k, a spread of only 2.3 points.
Brakes is the most common advisory, noted on 9.1% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 8.1% in 2021 to 6.4% in 2025, as the worst-kept examples leave the fleet.
How it compares
By model year
Every Sierra Sapphire model year with a usable sample. Years with their own detailed report are linked.
| Year | Tests | Pass rate | Fail rate | Most common failure |
|---|---|---|---|---|
| 1988 | 329 | 95.1% | 4.9% | Lighting & signalling |
| 1989 | 641 | 93.0% | 7.0% | Lighting & signalling |
| 1990 | 487 | 94.3% | 5.8% | Lighting & signalling |
| 1991 | 342 | 89.5% | 10.5% | Lighting & signalling |
| 1992 | 296 | 90.5% | 9.5% | Lighting & signalling |
| 1993 | 74 | 85.1% | 14.9% | Lighting & signalling |
Most common failures (all years)
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 4.5% | 100 |
| 2 | Brakes | 2.5% | 55 |
| 3 | Suspension | 2.4% | 53 |
| 4 | Emissions & environmental | 2.4% | 53 |
| 5 | Body, structure & corrosion | 1.9% | 42 |
| 6 | Visibility | 1.5% | 34 |
| 7 | Tyres | 0.8% | 17 |
| 8 | Seat belts & restraints | 0.7% | 16 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Non catalyst emissions | 40 |
| 2 | Headlamp | 39 |
| 3 | Headlamp aim | 35 |
| 4 | Component mounting prescribed areas | 31 |
| 5 | Position lamp | 24 |
| 6 | Flexible brake hoses | 23 |
| 7 | Prescribed areas | 23 |
| 8 | Catalyst emissions | 21 |
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 | 9.1% | 202 |
| 2 | Suspension | 8.1% | 179 |
| 3 | Emissions & environmental | 7.6% | 167 |
| 4 | Body, structure & corrosion | 5.3% | 117 |
| 5 | Tyres | 5.1% | 113 |
| 6 | Other defects | 3.1% | 69 |
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 | 674 | 7.0% |
| 30-60k | 569 | 6.2% |
| 60-90k | 619 | 8.7% |
| 90-120k | 325 | 9.2% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 479 | 8.1% |
| 2022 | 474 | 7.6% |
| 2023 | 454 | 8.4% |
| 2024 | 398 | 7.3% |
| 2025 | 404 | 6.4% |
What to check before buying a Ford Sierra Sapphire
- Lighting & signalling (4.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (2.5% 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 (2.4% 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
What is the MOT pass rate for the Ford Sierra Sapphire?
92.4% of the 2,209 Ford Sierra Sapphire MOT tests in this dataset passed, a 7.6% fail rate, across model years 1985–2021.
What does the Ford Sierra Sapphire most often fail its MOT on?
Lighting & signalling, recorded in 4.5% of tests, then brakes (2.5%).
How much does mileage affect Sierra Sapphire MOT results?
Fail rates run at 7.0% for cars in the 0-30k band and 9.2% for 90-120k, a 2.3-point difference.
Methodology & source. Based on 2,209 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.