1999 Audi A4 — MOT failures & pass rate
Across 5,746 MOT tests analysed for the 1999 Audi A4, the most common recorded failure areas were suspension, lighting & signalling and brakes. Its pass rate of 73.2% was below the average for executive cars of a similar age (76.3%). Higher-mileage examples failed more often — 27.6% in the 150k+ group versus 15.0% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Suspension | 13.3% | 762 |
| 2 | Lighting & signalling | 12.0% | 689 |
| 3 | Brakes | 9.5% | 544 |
| 4 | Body, structure & corrosion | 8.6% | 495 |
| 5 | Emissions & environmental | 5.9% | 340 |
| 6 | Steering | 4.6% | 263 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Ball joint | 450 |
| 2 | Joints | 386 |
| 3 | Catalyst emissions | 382 |
| 4 | Headlamp aim | 317 |
| 5 | Pins and bushes | 239 |
| 6 | Track rod end | 239 |
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 | 39.1% | 2,244 |
| 2 | Brakes | 33.0% | 1,894 |
| 3 | Tyres | 24.4% | 1,403 |
| 4 | Emissions & environmental | 20.2% | 1,160 |
| 5 | Body, structure & corrosion | 17.0% | 974 |
| 6 | Lighting & signalling | 14.7% | 845 |
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 | 40 | 15.0% |
| 30-60k | 135 | 16.3% |
| 60-90k | 503 | 23.3% |
| 90-120k | 865 | 26.6% |
| 120-150k | 1,183 | 27.7% |
| 150k+ | 3,005 | 27.6% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 3,802 | 26.4% |
| Diesel | 1,944 | 27.6% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 1,657 | 28.4% |
| 2022 | 1,345 | 26.8% |
| 2023 | 1,096 | 27.1% |
| 2024 | 869 | 23.9% |
| 2025 | 779 | 26.2% |
What to check before buying a 1999 A4
Before buying a 1999 Audi A4, focus on the areas it most often fails on. Suspension accounted for 13.3% of tests for this year.
- Suspension (13.3% 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.
- Lighting & signalling (12.0% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (9.5% 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 1999 Audi A4s pass their MOT?
73.2% of the 5,746 1999 Audi A4 MOT tests in this dataset passed — a 26.8% fail rate.
What is the most common MOT failure on a 1999 Audi A4?
Suspension, recorded in 13.3% of tests, followed by lighting & signalling (12.0%).
Does the 1999 A4 get worse with mileage?
Its MOT fail rate rises from 15.0% in the 0-30k band to 27.6% in the 150k+ band.
Methodology & source. Based on 5,746 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.