1998 Mercedes-Benz E-Class — MOT failures & pass rate
The 1998 Mercedes-Benz E-Class passed 79.8% of its 4,100 recorded MOT tests. Against executive cars of a similar age (22.8% fail rate), the 1998 E-Class comes out 2.6pp better. Failures cluster in lighting & signalling, suspension and visibility.
What the MOT record shows
Lighting & signalling dominates the failure mix at 15.6% of all tests — 7.8 points clear of suspension, so it is the first thing to check.
At component level the recurring items are stop lamp, headlamp aim and washers — stop lamp alone was recorded 240 times.
Condition tracks the odometer closely. Failures run at 17.4% in the 0-30k band and 24.5% in the 150k+ band, a 7.1-point spread.
Fuel type barely separates them — diesel fails 20.0% of the time against 20.3% for petrol.
Advisories point at the next bill rather than this one: suspension was flagged on 32.9% of tests without failing them.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 15.6% | 641 |
| 2 | Suspension | 7.8% | 320 |
| 3 | Visibility | 6.5% | 265 |
| 4 | Brakes | 6.0% | 248 |
| 5 | Body, structure & corrosion | 4.8% | 198 |
| 6 | Tyres | 4.2% | 170 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Stop lamp | 240 |
| 2 | Headlamp aim | 224 |
| 3 | Washers | 190 |
| 4 | Headlamp | 172 |
| 5 | Component mounting prescribed areas | 171 |
| 6 | Side repeaters | 148 |
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 | 32.9% | 1,350 |
| 2 | Brakes | 32.4% | 1,330 |
| 3 | Tyres | 20.8% | 852 |
| 4 | Emissions & environmental | 16.7% | 686 |
| 5 | Lighting & signalling | 16.1% | 658 |
| 6 | Other defects | 12.6% | 518 |
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 | 69 | 17.4% |
| 30-60k | 391 | 13.3% |
| 60-90k | 830 | 16.3% |
| 90-120k | 897 | 21.7% |
| 120-150k | 935 | 20.8% |
| 150k+ | 962 | 24.5% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 2,915 | 20.3% |
| Diesel | 1,185 | 20.0% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 1,191 | 20.6% |
| 2022 | 982 | 21.2% |
| 2023 | 800 | 20.8% |
| 2024 | 609 | 17.4% |
| 2025 | 518 | 19.9% |
What to check before buying a 1998 E-Class
On a 1998 E-Class, lighting & signalling is what the MOT record says goes wrong most — it appeared in 15.6% of tests. Check these areas before you commit.
- Lighting & signalling (15.6% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (7.8% 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.
- Visibility (6.5% of tests): Wipers, washers, mirrors and screen damage — usually inexpensive, but check for chips in the driver's line of sight. Typical repair: £15–£150.
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 1998 Mercedes-Benz E-Classs pass their MOT?
79.8% of the 4,100 1998 Mercedes-Benz E-Class MOT tests in this dataset passed — a 20.2% fail rate.
What is the most common MOT failure on a 1998 Mercedes-Benz E-Class?
Lighting & signalling, recorded in 15.6% of tests, followed by suspension (7.8%).
Does the 1998 E-Class get worse with mileage?
Its MOT fail rate rises from 17.4% in the 0-30k band to 24.5% in the 150k+ band.
Methodology & source. Based on 4,100 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.