2021 Audi Q4 E-Tron S Line Launch Ed 40 — MOT failures & pass rate
Across 1,022 MOT tests analysed for the 2021 Audi Q4 E-Tron S Line Launch Ed 40, the most common recorded failure areas were tyres, visibility and lighting & signalling. Its pass rate of 90.2% 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 | 8.2% | 84 |
| 2 | Visibility | 1.3% | 13 |
| 3 | Lighting & signalling | 1.2% | 12 |
| 4 | Suspension | 0.6% | 6 |
| 5 | Other defects | 0.3% | 3 |
| 6 | Brakes | 0.3% | 3 |
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 | 31 |
| 2 | Headlamp aim | 12 |
| 3 | Wipers | 8 |
| 4 | Washers | 7 |
| 5 | Attachment | 5 |
| 6 | Linkage ball joints | 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 | 24.3% | 248 |
| 2 | Other defects | 5.6% | 57 |
| 3 | Suspension | 2.4% | 24 |
| 4 | Visibility | 1.6% | 16 |
| 5 | Brakes | 1.4% | 14 |
| 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 | 444 | 9.2% |
| 30-60k | 513 | 9.9% |
| 60-90k | 62 | 11.3% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 506 | 10.3% |
| 2025 | 508 | 9.4% |
What to check before buying a 2021 Q4 E-Tron S Line Launch Ed 40
Before buying a 2021 Audi Q4 E-Tron S Line Launch Ed 40, focus on the areas it most often fails on. Tyres accounted for 8.2% of tests for this year.
- Tyres (8.2% 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.
- Visibility (1.3% 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.
- Lighting & signalling (1.2% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£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 S Line Launch Ed 40s pass their MOT?
90.2% of the 1,022 2021 Audi Q4 E-Tron S Line Launch Ed 40 MOT tests in this dataset passed — a 9.8% fail rate.
What is the most common MOT failure on a 2021 Audi Q4 E-Tron S Line Launch Ed 40?
Tyres, recorded in 8.2% of tests, followed by visibility (1.3%).
Does the 2021 Q4 E-Tron S Line Launch Ed 40 get worse with mileage?
Its MOT fail rate rises from 9.2% in the 0-30k band to 11.3% in the 60-90k band.
Methodology & source. Based on 1,022 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.