1985 Mercedes-Benz E-Class — MOT failures & pass rate
Across 262 MOT tests, the 1985 Mercedes-Benz E-Class recorded a 70.6% pass rate. Against executive cars of a similar age (17.3% fail rate), the 1985 E-Class comes out 12.0pp worse. Failures cluster in lighting & signalling, brakes and body, structure & corrosion.
What the MOT record shows
Lighting & signalling dominates the failure mix at 18.7% of all tests — 4.2 points clear of brakes, so it is the first thing to check.
At component level the recurring items are position lamp, component mounting prescribed areas and headlamp — position lamp alone was recorded 23 times.
Mileage matters less than usual here: the 1985 E-Class fails 31.5% of the time in the 90-120k band and 29.0% at 150k+, a spread of only 2.5 points.
Advisories point at the next bill rather than this one: suspension was flagged on 29.4% of tests without failing them.
The trend is worsening — 28.8% of tests failed in 2021 against 37.1% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 18.7% | 49 |
| 2 | Brakes | 14.5% | 38 |
| 3 | Body, structure & corrosion | 13.7% | 36 |
| 4 | Suspension | 12.6% | 33 |
| 5 | Visibility | 5.3% | 14 |
| 6 | Seat belts & restraints | 4.6% | 12 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Position lamp | 23 |
| 2 | Component mounting prescribed areas | 20 |
| 3 | Headlamp | 18 |
| 4 | Service brake performance | 18 |
| 5 | Integral vehicle structure condition | 18 |
| 6 | Rbt (sp) | 16 |
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 | 29.4% | 77 |
| 2 | Body, structure & corrosion | 25.2% | 66 |
| 3 | Brakes | 22.5% | 59 |
| 4 | Steering | 15.7% | 41 |
| 5 | Emissions & environmental | 15.3% | 40 |
| 6 | Tyres | 13.4% | 35 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 90-120k | 54 | 31.5% |
| 120-150k | 66 | 36.4% |
| 150k+ | 100 | 29.0% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 66 | 28.8% |
| 2022 | 64 | 31.3% |
| 2023 | 58 | 29.3% |
| 2024 | 39 | 20.5% |
| 2025 | 35 | 37.1% |
What to check before buying a 1985 E-Class
On a 1985 E-Class, lighting & signalling is what the MOT record says goes wrong most — it appeared in 18.7% of tests. Check these areas before you commit.
- Lighting & signalling (18.7% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (14.5% 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.
- Body, structure & corrosion (13.7% of tests): The one to take seriously on older cars — corrosion to structural areas can be costly and is an MOT failure. Typical repair: £200–£1,500+.
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 1985 Mercedes-Benz E-Classs pass their MOT?
70.6% of the 262 1985 Mercedes-Benz E-Class MOT tests in this dataset passed — a 29.4% fail rate.
What is the most common MOT failure on a 1985 Mercedes-Benz E-Class?
Lighting & signalling, recorded in 18.7% of tests, followed by brakes (14.5%).
Does the 1985 E-Class get worse with mileage?
Its MOT fail rate rises from 31.5% in the 90-120k band to 29.0% in the 150k+ band.
Methodology & source. Based on 262 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.