1992 Mercedes-Benz E-Class — MOT failures & pass rate
The 1992 Mercedes-Benz E-Class passed 81.2% of its 255 recorded MOT tests. Executive cars of a similar age fail at 19.7%, so the 1992 E-Class sits squarely on the average. Failures cluster in lighting & signalling, brakes and emissions & environmental.
What the MOT record shows
Lighting & signalling dominates the failure mix at 12.2% of all tests — 5.5 points clear of brakes, so it is the first thing to check.
At component level the recurring items are headlamp aim, service brake performance and position lamp — headlamp aim alone was recorded 16 times.
Condition tracks the odometer closely. Failures run at 15.0% in the 90-120k band and 20.8% in the 150k+ band, a 5.8-point spread.
Advisories point at the next bill rather than this one: suspension was flagged on 27.8% of tests without failing them.
The trend is worsening — 17.0% of tests failed in 2021 against 22.6% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 12.2% | 31 |
| 2 | Brakes | 6.7% | 17 |
| 3 | Emissions & environmental | 5.1% | 13 |
| 4 | Body, structure & corrosion | 3.9% | 10 |
| 5 | Visibility | 3.1% | 8 |
| 6 | Suspension | 2.8% | 7 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 16 |
| 2 | Service brake performance | 12 |
| 3 | Position lamp | 11 |
| 4 | Catalyst emissions | 10 |
| 5 | Rear fog lamp | 6 |
| 6 | Non catalyst emissions | 6 |
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 | 27.8% | 71 |
| 2 | Brakes | 27.5% | 70 |
| 3 | Emissions & environmental | 25.5% | 65 |
| 4 | Tyres | 16.5% | 42 |
| 5 | Visibility | 9.0% | 23 |
| 6 | Other defects | 8.6% | 22 |
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 | 40 | 15.0% |
| 120-150k | 62 | 17.7% |
| 150k+ | 101 | 20.8% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 47 | 17.0% |
| 2022 | 54 | 16.7% |
| 2023 | 50 | 18.0% |
| 2024 | 51 | 19.6% |
| 2025 | 53 | 22.6% |
What to check before buying a 1992 E-Class
On a 1992 E-Class, lighting & signalling is what the MOT record says goes wrong most — it appeared in 12.2% of tests. Check these areas before you commit.
- Lighting & signalling (12.2% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (6.7% 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.
- Emissions & environmental (5.1% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
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 1992 Mercedes-Benz E-Classs pass their MOT?
81.2% of the 255 1992 Mercedes-Benz E-Class MOT tests in this dataset passed — a 18.8% fail rate.
What is the most common MOT failure on a 1992 Mercedes-Benz E-Class?
Lighting & signalling, recorded in 12.2% of tests, followed by brakes (6.7%).
Does the 1992 E-Class get worse with mileage?
Its MOT fail rate rises from 15.0% in the 90-120k band to 20.8% in the 150k+ band.
Methodology & source. Based on 255 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.