2021 Fiat 500 Rockstar Mhev — MOT failures & pass rate
Across 1,299 MOT tests analysed for the 2021 Fiat 500 Rockstar Mhev, the most common recorded failure areas were tyres, lighting & signalling and visibility. Its pass rate of 90.8% was in line with the average for cars of a similar age (91.2%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 6.5% | 85 |
| 2 | Lighting & signalling | 2.6% | 34 |
| 3 | Visibility | 2.3% | 30 |
| 4 | Brakes | 0.6% | 8 |
| 5 | Suspension | 0.5% | 7 |
| 6 | Seat belts & restraints | 0.5% | 6 |
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 | 26 |
| 2 | Wipers | 19 |
| 3 | Tread depth | 17 |
| 4 | Washers | 15 |
| 5 | SRS malfunction indicator lamp | 6 |
| 6 | Headlamp | 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 | 20.5% | 266 |
| 2 | Brakes | 5.7% | 74 |
| 3 | Suspension | 4.3% | 56 |
| 4 | Other defects | 2.7% | 35 |
| 5 | Visibility | 2.6% | 34 |
| 6 | Road wheels | 0.8% | 10 |
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 | 795 | 7.8% |
| 30-60k | 495 | 11.3% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 1,269 | 9.3% |
| Hybrid | 30 | 3.3% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 616 | 7.5% |
| 2025 | 665 | 10.8% |
What to check before buying a 2021 500 Rockstar Mhev
Before buying a 2021 Fiat 500 Rockstar Mhev, focus on the areas it most often fails on. Tyres accounted for 6.5% of tests for this year.
- Tyres (6.5% 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 (2.6% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (2.3% 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 2021 Fiat 500 Rockstar Mhevs pass their MOT?
90.8% of the 1,299 2021 Fiat 500 Rockstar Mhev MOT tests in this dataset passed — a 9.2% fail rate.
What is the most common MOT failure on a 2021 Fiat 500 Rockstar Mhev?
Tyres, recorded in 6.5% of tests, followed by lighting & signalling (2.6%).
Does the 2021 500 Rockstar Mhev get worse with mileage?
Its MOT fail rate rises from 7.8% in the 0-30k band to 11.3% in the 30-60k band.
Methodology & source. Based on 1,299 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.