2015 Audi TT — MOT failures & pass rate
The 2015 Audi TT passed 89.9% of its 47,815 recorded MOT tests. Coupes & convertibles of a similar age fail 11.9% of the time, so this is 1.8pp better than the group it competes with. Failures cluster in tyres, lighting & signalling and brakes.
What the MOT record shows
No single area dominates — tyres (5.3%) and lighting & signalling (2.8%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are tread depth, registration plate lamp(s) and brake pads — tread depth alone was recorded 1,698 times.
Mileage is the strongest signal on the record: 5.5% of 0-30k cars fail, rising to 14.8% once past 150k — 2.7× the risk.
Split by fuel, diesel examples fail 3.0pp more often than petrol ones (12.1% vs 9.1%) — worth weighing if you have a choice.
Advisories point at the next bill rather than this one: tyres was flagged on 23.3% of tests without failing them.
The trend is worsening — 8.1% of tests failed in 2021 against 11.7% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 5.3% | 2,522 |
| 2 | Lighting & signalling | 2.8% | 1,316 |
| 3 | Brakes | 2.2% | 1,049 |
| 4 | Suspension | 1.3% | 613 |
| 5 | Visibility | 1.2% | 574 |
| 6 | Emissions & environmental | 0.7% | 323 |
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 | 1,698 |
| 2 | Registration plate lamp(s) | 863 |
| 3 | Brake pads | 648 |
| 4 | Shock absorbers | 592 |
| 5 | Headlamp aim | 493 |
| 6 | Brake discs | 440 |
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 | 23.3% | 11,143 |
| 2 | Brakes | 18.6% | 8,904 |
| 3 | Suspension | 6.3% | 2,995 |
| 4 | Other defects | 4.2% | 2,009 |
| 5 | Visibility | 3.2% | 1,531 |
| 6 | Lighting & signalling | 1.5% | 704 |
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 | 6,381 | 5.5% |
| 30-60k | 22,785 | 8.7% |
| 60-90k | 14,127 | 12.3% |
| 90-120k | 3,644 | 16.9% |
| 120-150k | 700 | 17.3% |
| 150k+ | 176 | 14.8% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 32,056 | 9.1% |
| Diesel | 15,759 | 12.1% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 9,522 | 8.1% |
| 2022 | 9,499 | 8.9% |
| 2023 | 9,634 | 10.7% |
| 2024 | 9,580 | 11.2% |
| 2025 | 9,580 | 11.7% |
What to check before buying a 2015 TT
On a 2015 TT, tyres is what the MOT record says goes wrong most — it appeared in 5.3% of tests. Check these areas before you commit.
- Tyres (5.3% 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 (2.8% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (2.2% 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 2015 Audi TTs pass their MOT?
89.9% of the 47,815 2015 Audi TT MOT tests in this dataset passed — a 10.1% fail rate.
What is the most common MOT failure on a 2015 Audi TT?
Tyres, recorded in 5.3% of tests, followed by lighting & signalling (2.8%).
Does the 2015 TT get worse with mileage?
Its MOT fail rate rises from 5.5% in the 0-30k band to 14.8% in the 150k+ band.
Methodology & source. Based on 47,815 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.