1984 Mercedes-Benz E-Class — MOT failures & pass rate
308 MOT tests on the 1984 Mercedes-Benz E-Class are in this dataset, and 79.5% of them passed. Against executive cars of a similar age (17.5% fail rate), the 1984 E-Class comes out 2.9pp worse. Failures cluster in suspension, lighting & signalling and body, structure & corrosion.
What the MOT record shows
No single area dominates — suspension (11.4%) and lighting & signalling (9.1%) 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, headlamp aim and wipers — component mounting prescribed areas alone was recorded 30 times.
Condition tracks the odometer closely. Failures run at 16.7% in the 60-90k band and 25.2% in the 150k+ band, a 8.6-point spread.
Suspension is the most common advisory, noted on 21.4% of tests — work that passed today but is likely due soon.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Suspension | 11.4% | 35 |
| 2 | Lighting & signalling | 9.1% | 28 |
| 3 | Body, structure & corrosion | 7.1% | 22 |
| 4 | Brakes | 7.1% | 22 |
| 5 | Visibility | 4.5% | 14 |
| 6 | Emissions & environmental | 3.3% | 10 |
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 | 30 |
| 2 | Headlamp aim | 14 |
| 3 | Wipers | 13 |
| 4 | Headlamp | 12 |
| 5 | Ball joint dust cover | 12 |
| 6 | Prescribed areas | 11 |
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 | 21.4% | 66 |
| 2 | Body, structure & corrosion | 18.5% | 57 |
| 3 | Brakes | 15.6% | 48 |
| 4 | Emissions & environmental | 14.0% | 43 |
| 5 | Steering | 14.0% | 43 |
| 6 | Other defects | 10.4% | 32 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 60-90k | 30 | 16.7% |
| 90-120k | 47 | 17.0% |
| 120-150k | 100 | 21.0% |
| 150k+ | 111 | 25.2% |
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 273 | 19.4% |
| Diesel | 35 | 28.6% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 74 | 23.0% |
| 2022 | 72 | 22.2% |
| 2023 | 71 | 16.9% |
| 2024 | 54 | 18.5% |
| 2025 | 37 | 21.6% |
What to check before buying a 1984 E-Class
The failure pattern for this year is specific enough to inspect against: suspension accounted for 11.4% of tests. Start there.
- Suspension (11.4% 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.
- Lighting & signalling (9.1% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Body, structure & corrosion (7.1% 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 1984 Mercedes-Benz E-Classs pass their MOT?
79.5% of the 308 1984 Mercedes-Benz E-Class MOT tests in this dataset passed — a 20.4% fail rate.
What is the most common MOT failure on a 1984 Mercedes-Benz E-Class?
Suspension, recorded in 11.4% of tests, followed by lighting & signalling (9.1%).
Does the 1984 E-Class get worse with mileage?
Its MOT fail rate rises from 16.7% in the 60-90k band to 25.2% in the 150k+ band.
Methodology & source. Based on 308 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.