1989 Mercedes-Benz 230 — MOT failures & pass rate
Across 456 MOT tests, the 1989 Mercedes-Benz 230 recorded a 76.8% pass rate. Against all cars of a similar age (21.3% fail rate), the 1989 230 comes out 1.9pp worse. Failures cluster in lighting & signalling, suspension and brakes.
What the MOT record shows
One area stands out: lighting & signalling, recorded in 13.8% of tests against 9.7% for the next-worst category.
At component level the recurring items are service brake performance, exhaust system and headlamp aim — service brake performance alone was recorded 25 times.
A 150k+ example is materially riskier than a 0-30k one: 30.8% versus 15.2%.
Suspension is the most common advisory, noted on 34.6% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 22.8% in 2021 to 17.3% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 13.8% | 63 |
| 2 | Suspension | 9.7% | 44 |
| 3 | Brakes | 8.6% | 39 |
| 4 | Body, structure & corrosion | 7.9% | 36 |
| 5 | Emissions & environmental | 3.5% | 16 |
| 6 | Tyres | 3.1% | 14 |
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 | 25 |
| 2 | Exhaust system | 17 |
| 3 | Headlamp aim | 16 |
| 4 | Rear fog lamp | 16 |
| 5 | Component mounting prescribed areas | 15 |
| 6 | Rbt (sp) | 14 |
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 | 34.6% | 158 |
| 2 | Brakes | 26.3% | 120 |
| 3 | Emissions & environmental | 18.6% | 85 |
| 4 | Body, structure & corrosion | 17.8% | 81 |
| 5 | Tyres | 14.5% | 66 |
| 6 | Steering | 9.9% | 45 |
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 | 33 | 15.2% |
| 30-60k | 78 | 26.9% |
| 60-90k | 90 | 16.7% |
| 90-120k | 67 | 19.4% |
| 120-150k | 45 | 17.8% |
| 150k+ | 143 | 30.8% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 92 | 22.8% |
| 2022 | 112 | 23.2% |
| 2023 | 95 | 25.3% |
| 2024 | 82 | 26.8% |
| 2025 | 75 | 17.3% |
What to check before buying a 1989 230
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 13.8% of tests. Start there.
- Lighting & signalling (13.8% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (9.7% 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.
- Brakes (8.6% 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 Mercedes-Benz 230s pass their MOT?
76.8% of the 456 1989 Mercedes-Benz 230 MOT tests in this dataset passed — a 23.3% fail rate.
What is the most common MOT failure on a 1989 Mercedes-Benz 230?
Lighting & signalling, recorded in 13.8% of tests, followed by suspension (9.7%).
Does the 1989 230 get worse with mileage?
Its MOT fail rate rises from 15.2% in the 0-30k band to 30.8% in the 150k+ band.
Methodology & source. Based on 456 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.