2021 Audi Q5 S Ln Ed1 40Tdi Mhev Quat Sa — MOT failures & pass rate
Across 1,814 MOT tests analysed for the 2021 Audi Q5 S Ln Ed1 40Tdi Mhev Quat Sa, the most common recorded failure areas were tyres, emissions & environmental and lighting & signalling. Its pass rate of 93.9% was above the average for cars of a similar age (91.2%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 3.8% | 69 |
| 2 | Emissions & environmental | 1.3% | 24 |
| 3 | Lighting & signalling | 0.8% | 15 |
| 4 | Brakes | 0.7% | 13 |
| 5 | Visibility | 0.5% | 9 |
| 6 | Other defects | 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 | 35 |
| 2 | Malfunction indicator lamp | 20 |
| 3 | Brake pads | 14 |
| 4 | Headlamp aim | 12 |
| 5 | Registration plates | 10 |
| 6 | Washers | 6 |
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 | 17.2% | 312 |
| 2 | Brakes | 11.5% | 208 |
| 3 | Other defects | 5.8% | 105 |
| 4 | Visibility | 2.6% | 47 |
| 5 | Suspension | 1.2% | 21 |
| 6 | Lighting & signalling | 0.7% | 13 |
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 | 726 | 6.3% |
| 30-60k | 966 | 5.5% |
| 60-90k | 115 | 8.7% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 890 | 6.1% |
| 2025 | 899 | 6.2% |
What to check before buying a 2021 Q5 S Ln Ed1 40Tdi Mhev Quat Sa
Before buying a 2021 Audi Q5 S Ln Ed1 40Tdi Mhev Quat Sa, focus on the areas it most often fails on. Tyres accounted for 3.8% of tests for this year.
- Tyres (3.8% 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.
- Emissions & environmental (1.3% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
- Lighting & signalling (0.8% 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 Q5 S Ln Ed1 40Tdi Mhev Quat Sas pass their MOT?
93.9% of the 1,814 2021 Audi Q5 S Ln Ed1 40Tdi Mhev Quat Sa MOT tests in this dataset passed — a 6.1% fail rate.
What is the most common MOT failure on a 2021 Audi Q5 S Ln Ed1 40Tdi Mhev Quat Sa?
Tyres, recorded in 3.8% of tests, followed by emissions & environmental (1.3%).
Does the 2021 Q5 S Ln Ed1 40Tdi Mhev Quat Sa get worse with mileage?
Its MOT fail rate rises from 6.3% in the 0-30k band to 8.7% in the 60-90k band.
Methodology & source. Based on 1,814 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.