2021 Hyundai Bayon T-Gdi Mhev — MOT failures & pass rate
Across 921 MOT tests analysed for the 2021 Hyundai Bayon T-Gdi Mhev, the most common recorded failure areas were visibility, tyres and brakes. Its pass rate of 92.3% was above the average for cars of a similar age (91.2%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Visibility | 6.8% | 63 |
| 2 | Tyres | 2.2% | 20 |
| 3 | Brakes | 1.3% | 12 |
| 4 | Lighting & signalling | 0.8% | 7 |
| 5 | Other defects | 0.3% | 3 |
| 6 | Steering | 0.2% | 2 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Wipers | 61 |
| 2 | Washers | 17 |
| 3 | Headlamp aim | 8 |
| 4 | Tread depth | 5 |
| 5 | Rbt (sp) | 5 |
| 6 | Registration plates | 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 | Tyres | 17.3% | 159 |
| 2 | Brakes | 7.9% | 73 |
| 3 | Other defects | 5.4% | 50 |
| 4 | Visibility | 3.7% | 34 |
| 5 | Seat belts & restraints | 0.5% | 5 |
| 6 | Lighting & signalling | 0.4% | 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 | 650 | 6.5% |
| 30-60k | 262 | 10.7% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 459 | 8.5% |
| 2025 | 459 | 7.0% |
What to check before buying a 2021 Bayon T-Gdi Mhev
Before buying a 2021 Hyundai Bayon T-Gdi Mhev, focus on the areas it most often fails on. Visibility accounted for 6.8% of tests for this year.
- Visibility (6.8% 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 (2.2% 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.
- Brakes (1.3% 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 2021 Hyundai Bayon T-Gdi Mhevs pass their MOT?
92.3% of the 921 2021 Hyundai Bayon T-Gdi Mhev MOT tests in this dataset passed — a 7.7% fail rate.
What is the most common MOT failure on a 2021 Hyundai Bayon T-Gdi Mhev?
Visibility, recorded in 6.8% of tests, followed by tyres (2.2%).
Does the 2021 Bayon T-Gdi Mhev get worse with mileage?
Its MOT fail rate rises from 6.5% in the 0-30k band to 10.7% in the 30-60k band.
Methodology & source. Based on 921 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.