2021 Audi Q4 E-Tron 35 — MOT failures & pass rate
Across 661 MOT tests analysed for the 2021 Audi Q4 E-Tron 35, the most common recorded failure areas were tyres, lighting & signalling and visibility. Its pass rate of 90.0% was below the average for cars of a similar age (91.2%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 8.6% | 57 |
| 2 | Lighting & signalling | 1.7% | 11 |
| 3 | Visibility | 1.1% | 7 |
| 4 | Seat belts & restraints | 0.8% | 5 |
| 5 | Suspension | 0.3% | 2 |
| 6 | Body, structure & corrosion | 0.3% | 2 |
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 | 14 |
| 2 | Headlamp aim | 11 |
| 3 | Washers | 6 |
| 4 | SRS malfunction indicator lamp | 5 |
| 5 | Tyre pressure monitoring system | 4 |
| 6 | Size/type | 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 | 23.2% | 153 |
| 2 | Other defects | 5.3% | 35 |
| 3 | Brakes | 1.8% | 12 |
| 4 | Suspension | 1.8% | 12 |
| 5 | Visibility | 1.7% | 11 |
| 6 | Emissions & environmental | 0.3% | 2 |
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 | 366 | 10.4% |
| 30-60k | 271 | 8.9% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 328 | 10.4% |
| 2025 | 332 | 9.6% |
What to check before buying a 2021 Q4 E-Tron 35
Before buying a 2021 Audi Q4 E-Tron 35, focus on the areas it most often fails on. Tyres accounted for 8.6% of tests for this year.
- Tyres (8.6% 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 (1.7% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (1.1% 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 Audi Q4 E-Tron 35s pass their MOT?
90.0% of the 661 2021 Audi Q4 E-Tron 35 MOT tests in this dataset passed — a 10.0% fail rate.
What is the most common MOT failure on a 2021 Audi Q4 E-Tron 35?
Tyres, recorded in 8.6% of tests, followed by lighting & signalling (1.7%).
Does the 2021 Q4 E-Tron 35 get worse with mileage?
Its MOT fail rate rises from 10.4% in the 0-30k band to 8.9% in the 30-60k band.
Methodology & source. Based on 661 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.