The 2017 Audi A4 sat 64,427 MOT tests between 2022 and 2024, passing first time in 83.6% of them. That puts it 3.1 points above the national average for cars its age.
Everything here comes from the DVSA's published MOT results, not a survey. For the other years we hold, see every A4 we've measured.
How reliable is the 2017 A4?
At 83.6% first-time passes, the 2017 Audi A4 is an above-average performer for its age, 3.1 points above the 80.5% average for cars aged 3 to 8.
Read that as a roadworthiness record, not a survey score. It counts how often one of these reaches the test station needing work, so a car with a careful owner and a full history can still beat the figure. Here is how the pass rate moves as the car ages:
First-time pass rate by vehicle age, 64,427 tests. Every cohort shown has at least 500 tests.
The steepest fall comes between 5 and 6 years old, where the pass rate drops 3.1 points, from 84.8% to 81.7%. That is usually where the first big-ticket wear items land together, brakes, suspension and tyres. A car just the far side of that age can be worth more scrutiny, or a lower offer, than its age alone suggests.
What goes wrong on the A4
The area examiners flag most on this 2017 A4 is brakes, on 25.3% of tests: discs and pads are wear items on any car this age, so it is often just routine maintenance, but grinding, a spongy pedal or pulling to one side means budgeting for work.
Behind it comes emissions and leaks at 1.6%, exhaust, emissions and fluid leaks; on older diesels an emissions fail can point to a DPF or EGR problem that is not cheap to fix. Lights & electrics rounds out the top three at 1.4%.
None of this makes it a bad buy: these are the ordinary consequences of age and mileage. They just tell you what to look and listen for before you commit, with each figure linking through to the DVSA's own inspection criteria for that part.
Share of tests with a fail or advisory per component, this cohort only. Check the top items on any test drive.
What mileage should a 2017 A4 have?
A typical 2017 A4 shows around 49,171 miles by 4 years old, climbing to roughly 75,469 by 7. A car well above that has simply worked harder than average, which matters more for wear than for the MOT itself.
A car well below it is not automatically the better buy. 0.38% of A4s this age carry odometer readings that don't add up, so treat a suspiciously low reading as a reason to check the mileage history, not to relax. You can cross-check any figure against the DVSA's own MOT history record.
Average recorded mileage by age for this cohort. Use it as a yardstick against any individual car.
Audi A4 reliability by year
First-time pass rates for adjacent registration years of the same model. A big step change usually marks a facelift or new generation.
Before you buy one
Start where the data points: inspect brakes first on any viewing, since it flags on 25.3% of these. Then run the exact car through a free MOT check to see its own history against these averages.
Two things this data cannot show: open recalls, and hidden finance or write-offs. Check recalls with the government's recall service; for the rest, our methodology explains where the public record stops.