1999 Audi Tt — MOT failures & pass rate
Across 2,652 MOT tests analysed for the 1999 Audi Tt, the most common recorded failure areas were lighting & signalling, brakes and suspension. Its pass rate of 71.2% was below the average for coupes & convertibles of a similar age (77.9%). Higher-mileage examples failed more often — 29.1% in the 150k+ group versus 10.0% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 16.6% | 441 |
| 2 | Brakes | 12.6% | 334 |
| 3 | Suspension | 12.6% | 333 |
| 4 | Body, structure & corrosion | 7.1% | 188 |
| 5 | Emissions & environmental | 6.8% | 179 |
| 6 | Visibility | 6.2% | 163 |
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 | 227 |
| 2 | Catalyst emissions | 203 |
| 3 | Pins and bushes | 168 |
| 4 | Position lamp | 166 |
| 5 | Headlamp | 150 |
| 6 | Joints | 126 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Suspension | 41.0% | 1,088 |
| 2 | Brakes | 39.6% | 1,051 |
| 3 | Tyres | 24.2% | 642 |
| 4 | Lighting & signalling | 19.8% | 525 |
| 5 | Emissions & environmental | 19.6% | 519 |
| 6 | Body, structure & corrosion | 17.2% | 456 |
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 | 30 | 10.0% |
| 30-60k | 97 | 23.7% |
| 60-90k | 287 | 18.8% |
| 90-120k | 767 | 28.2% |
| 120-150k | 847 | 33.7% |
| 150k+ | 618 | 29.1% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 725 | 31.9% |
| 2022 | 653 | 28.8% |
| 2023 | 528 | 26.3% |
| 2024 | 421 | 29.7% |
| 2025 | 325 | 25.2% |
What to check before buying a 1999 Tt
Before buying a 1999 Audi Tt, focus on the areas it most often fails on. Lighting & signalling accounted for 16.6% of tests for this year.
- Lighting & signalling (16.6% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (12.6% 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.
- Suspension (12.6% of tests): Worn drop links, bushes, springs or shocks — listen for knocks over bumps and check for uneven tyre wear. Typical repair: £150–£450 per corner.
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 1999 Audi Tts pass their MOT?
71.2% of the 2,652 1999 Audi Tt MOT tests in this dataset passed — a 28.8% fail rate.
What is the most common MOT failure on a 1999 Audi Tt?
Lighting & signalling, recorded in 16.6% of tests, followed by brakes (12.6%).
Does the 1999 Tt get worse with mileage?
Its MOT fail rate rises from 10.0% in the 0-30k band to 29.1% in the 150k+ band.
Methodology & source. Based on 2,652 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.