2018 Mercedes-Benz Hymer — MOT failures & pass rate
The 2018 Mercedes-Benz Hymer passed 94.1% of its 474 recorded MOT tests. All cars of a similar age fail 11.0% of the time, so this is 5.1pp better than the group it competes with. Failures cluster in lighting & signalling, visibility and brakes.
What the MOT record shows
No single area dominates — lighting & signalling (4.9%) and visibility (3.4%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are wipers, headlamp aim and outline marker lamp — wipers alone was recorded 17 times.
Brakes is the most common advisory, noted on 8.2% of tests — work that passed today but is likely due soon.
The trend is worsening — 2.0% of tests failed in 2021 against 6.4% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 4.9% | 23 |
| 2 | Visibility | 3.4% | 16 |
| 3 | Brakes | 2.1% | 10 |
| 4 | Emissions & environmental | 0.4% | 2 |
| 5 | Road wheels | 0.2% | 1 |
| 6 | Other defects | 0.2% | 1 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Wipers | 17 |
| 2 | Headlamp aim | 15 |
| 3 | Outline marker lamp | 10 |
| 4 | Brake discs | 8 |
| 5 | Rbt (sp) | 5 |
| 6 | Service brake performance | 4 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Brakes | 8.2% | 39 |
| 2 | Lighting & signalling | 4.4% | 21 |
| 3 | Visibility | 2.5% | 12 |
| 4 | Tyres | 1.9% | 9 |
| 5 | Other defects | 1.5% | 7 |
| 6 | Suspension | 1.3% | 6 |
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 | 392 | 5.6% |
| 30-60k | 71 | 5.6% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 98 | 2.0% |
| 2022 | 96 | 7.3% |
| 2023 | 97 | 6.2% |
| 2024 | 89 | 7.9% |
| 2025 | 94 | 6.4% |
What to check before buying a 2018 Hymer
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 4.9% of tests. Start there.
- Lighting & signalling (4.9% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (3.4% 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.
- Brakes (2.1% 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 2018 Mercedes-Benz Hymers pass their MOT?
94.1% of the 474 2018 Mercedes-Benz Hymer MOT tests in this dataset passed — a 5.9% fail rate.
What is the most common MOT failure on a 2018 Mercedes-Benz Hymer?
Lighting & signalling, recorded in 4.9% of tests, followed by visibility (3.4%).
Does the 2018 Hymer get worse with mileage?
Its MOT fail rate rises from 5.6% in the 0-30k band to 5.6% in the 30-60k band.
Methodology & source. Based on 474 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.