2003 Audi A8 — MOT failures & pass rate
852 MOT tests on the 2003 Audi A8 are in this dataset, and 79.3% of them passed. Against executive cars of a similar age (24.4% fail rate), the 2003 A8 comes out 3.7pp better. Failures cluster in lighting & signalling, suspension and brakes.
What the MOT record shows
Lighting & signalling dominates the failure mix at 11.3% of all tests — 4.3 points clear of suspension, so it is the first thing to check.
At component level the recurring items are headlamp aim, pins and bushes and washers — headlamp aim alone was recorded 54 times.
Condition tracks the odometer closely. Failures run at 16.3% in the 60-90k band and 21.1% in the 150k+ band, a 4.8-point spread.
Advisories point at the next bill rather than this one: tyres was flagged on 25.2% of tests without failing them.
The trend is improving — the fail rate fell from 21.8% in 2021 to 15.7% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 11.3% | 96 |
| 2 | Suspension | 6.9% | 59 |
| 3 | Brakes | 5.5% | 47 |
| 4 | Emissions & environmental | 5.2% | 44 |
| 5 | Visibility | 5.2% | 44 |
| 6 | Tyres | 4.9% | 42 |
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 | 54 |
| 2 | Pins and bushes | 44 |
| 3 | Washers | 37 |
| 4 | Position lamp | 29 |
| 5 | Catalyst emissions | 25 |
| 6 | Headlamp | 24 |
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 | 25.2% | 215 |
| 2 | Brakes | 23.6% | 201 |
| 3 | Suspension | 23.5% | 200 |
| 4 | Lighting & signalling | 15.7% | 134 |
| 5 | Body, structure & corrosion | 13.5% | 115 |
| 6 | Emissions & environmental | 13.0% | 111 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 60-90k | 92 | 16.3% |
| 90-120k | 205 | 21.5% |
| 120-150k | 255 | 21.2% |
| 150k+ | 275 | 21.1% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 722 | 21.2% |
| Diesel | 125 | 18.4% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 220 | 21.8% |
| 2022 | 215 | 22.3% |
| 2023 | 174 | 22.4% |
| 2024 | 141 | 17.7% |
| 2025 | 102 | 15.7% |
What to check before buying a 2003 A8
On a 2003 A8, lighting & signalling is what the MOT record says goes wrong most — it appeared in 11.3% of tests. Check these areas before you commit.
- Lighting & signalling (11.3% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (6.9% 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.
- Brakes (5.5% 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 2003 Audi A8s pass their MOT?
79.3% of the 852 2003 Audi A8 MOT tests in this dataset passed — a 20.7% fail rate.
What is the most common MOT failure on a 2003 Audi A8?
Lighting & signalling, recorded in 11.3% of tests, followed by suspension (6.9%).
Does the 2003 A8 get worse with mileage?
Its MOT fail rate rises from 16.3% in the 60-90k band to 21.1% in the 150k+ band.
Methodology & source. Based on 852 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.