2018 Hyundai I800 — MOT failures & pass rate
7,061 MOT tests on the 2018 Hyundai I800 are in this dataset, and 82.8% of them passed. Against all cars of a similar age (11.1% fail rate), the 2018 I800 comes out 6.1pp worse. Failures cluster in lighting & signalling, visibility and tyres.
What the MOT record shows
One area stands out: lighting & signalling, recorded in 19.5% of tests against 5.9% for the next-worst category.
At component level the recurring items are headlamp aim, headlamp and position lamp — headlamp aim alone was recorded 846 times.
Mileage matters less than usual here: the 2018 I800 fails 11.9% of the time in the 0-30k band and 14.4% at 150k+, a spread of only 2.5 points.
Tyres is the most common advisory, noted on 21.6% of tests — work that passed today but is likely due soon.
The trend is worsening — 15.6% of tests failed in 2021 against 18.4% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 19.5% | 1,375 |
| 2 | Visibility | 5.9% | 413 |
| 3 | Tyres | 5.2% | 370 |
| 4 | Brakes | 5.0% | 356 |
| 5 | Emissions & environmental | 3.8% | 270 |
| 6 | Suspension | 0.8% | 55 |
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 | 846 |
| 2 | Headlamp | 492 |
| 3 | Position lamp | 478 |
| 4 | Wipers | 357 |
| 5 | Brake pads | 251 |
| 6 | Malfunction indicator lamp | 233 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 21.6% | 1,529 |
| 2 | Brakes | 21.6% | 1,527 |
| 3 | Other defects | 11.1% | 785 |
| 4 | Lighting & signalling | 6.2% | 439 |
| 5 | Visibility | 3.7% | 262 |
| 6 | Emissions & environmental | 2.0% | 140 |
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 | 546 | 11.9% |
| 30-60k | 3,450 | 15.9% |
| 60-90k | 2,150 | 19.6% |
| 90-120k | 535 | 19.8% |
| 120-150k | 206 | 22.3% |
| 150k+ | 174 | 14.4% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 1,383 | 15.6% |
| 2022 | 1,398 | 15.5% |
| 2023 | 1,415 | 17.2% |
| 2024 | 1,454 | 18.9% |
| 2025 | 1,411 | 18.4% |
What to check before buying a 2018 I800
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 19.5% of tests. Start there.
- Lighting & signalling (19.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (5.9% 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.
- Tyres (5.2% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
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 Hyundai I800s pass their MOT?
82.8% of the 7,061 2018 Hyundai I800 MOT tests in this dataset passed — a 17.2% fail rate.
What is the most common MOT failure on a 2018 Hyundai I800?
Lighting & signalling, recorded in 19.5% of tests, followed by visibility (5.9%).
Does the 2018 I800 get worse with mileage?
Its MOT fail rate rises from 11.9% in the 0-30k band to 14.4% in the 150k+ band.
Methodology & source. Based on 7,061 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.