2018 Bmw I8 — MOT failures & pass rate
Across 2,056 MOT tests analysed for the 2018 Bmw I8, the most common recorded failure areas were tyres, lighting & signalling and visibility. Its pass rate of 92.4% was above the average for cars of a similar age (89.2%). Higher-mileage examples failed more often — 13.0% in the 60-90k group versus 6.2% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 4.7% | 97 |
| 2 | Lighting & signalling | 1.6% | 33 |
| 3 | Visibility | 1.4% | 29 |
| 4 | Other defects | 1.4% | 29 |
| 5 | Brakes | 0.5% | 10 |
| 6 | Road wheels | 0.3% | 6 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Tread depth | 120 |
| 2 | Registration plates | 49 |
| 3 | Headlamp aim | 37 |
| 4 | Wipers | 13 |
| 5 | Washers | 12 |
| 6 | Attachment | 9 |
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 | 18.4% | 378 |
| 2 | Other defects | 3.2% | 66 |
| 3 | Brakes | 2.9% | 59 |
| 4 | Visibility | 1.9% | 40 |
| 5 | Emissions & environmental | 0.4% | 8 |
| 6 | Body, structure & corrosion | 0.2% | 4 |
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 | 1,432 | 6.2% |
| 30-60k | 550 | 10.5% |
| 60-90k | 69 | 13.0% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 457 | 7.4% |
| 2022 | 429 | 7.0% |
| 2023 | 406 | 7.4% |
| 2024 | 395 | 8.6% |
| 2025 | 369 | 7.6% |
What to check before buying a 2018 I8
Before buying a 2018 Bmw I8, focus on the areas it most often fails on. Tyres accounted for 4.7% of tests for this year.
- Tyres (4.7% 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.
- Lighting & signalling (1.6% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (1.4% 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.
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 Bmw I8s pass their MOT?
92.4% of the 2,056 2018 Bmw I8 MOT tests in this dataset passed — a 7.6% fail rate.
What is the most common MOT failure on a 2018 Bmw I8?
Tyres, recorded in 4.7% of tests, followed by lighting & signalling (1.6%).
Does the 2018 I8 get worse with mileage?
Its MOT fail rate rises from 6.2% in the 0-30k band to 13.0% in the 60-90k band.
Methodology & source. Based on 2,056 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.