Should I buy a 2018 Audi A6 2.0 Diesel Automatic C7.5?

Explore common problems, estimated repair costs and practical checks for the 2018 Audi A6 2.0 Diesel Automatic C7.5. Use this guide to help assess a used car, then unlock a personalised report for the exact vehicle you're considering.

Common problems

1High Likelihood

EGR cooler and valve blockage or internal leak

Engine management light, reduced power, repeated particle-filter warnings, rough running, or unexplained coolant loss.

How to check

Warm the car fully, then drive at mixed town and A-road speeds with a few gentle accelerations.

Estimated Repair Cost

£1,200

2Moderate Likelihood

DPF loading and failed regenerations

DPF or engine warning light, cooling fans running after shutdown, poor fuel economy, rising oil level, or limp mode.

How to check

Drive until fully warm, then hold a steady faster-road speed and watch for warning lights, fan behaviour and how cleanly it pulls.

Estimated Repair Cost

£900

3Low Likelihood

Automatic gearbox judder, hesitation or rough take-up

Shunt when pulling away, hesitation in traffic, jerky low-speed changes, or a vibration under light load.

How to check

Creep in traffic, pull away gently several times, then accelerate smoothly through the lower gears.

Estimated Repair Cost

£1,800

MOT Failure Rate

0%5%10%15%20%0–20,000 miles: 6.5% (92 failed / 1,415 tests)20,000–40,000 miles: 9.3% (768 failed / 8,277 tests)40,000–60,000 miles: 10.7% (1,006 failed / 9,386 tests)60,000–80,000 miles: 11.7% (760 failed / 6,485 tests)80,000–100,000 miles: 12.3% (407 failed / 3,319 tests)100,000–120,000 miles: 13.3% (190 failed / 1,432 tests)120,000–140,000 miles: 16.0% (107 failed / 669 tests)140,000–160,000 miles: 14.8% (40 failed / 271 tests)160,000–180,000 miles: 10.9% (14 failed / 129 tests)180,000–200,000 miles: 16.2% (12 failed / 74 tests)020k40k60k80k100k120k140k160k180k200kMilesFailure rate
2018 Audi A6 2.0 Diesel Automatic C7.5

Audi A6 buying questions

Is a 2018 Audi A6 worth buying?

It can be, but only if the individual car backs it up. For the 2018 Audi A6 2.0 Diesel Automatic C7.5, treat model-level patterns as viewing priorities and let condition, history and inspection evidence decide.

What common problems affect the Audi A6 (2018)?

The problem cards above list the model-level checks for this guide. Read them as priorities for inspection and paperwork review, not proof that every example will have those faults.

What should I check before buying an Audi A6?

Look for evidence, not just assurances: MOT advisories, service history, repair invoices, warning lights, fluid leaks, tyre and brake condition, and how the car behaves on a proper test drive. And of course, look at your personalised Should I Buy This Car? report, outlining a full list of common issues in detail, a personalised road test, a plain-English explanation and a MotorIQ score.

A model guide is useful. A report on its registration is better.

The guide above gives you the model-level pattern. A personalised MotorIQ report checks the registration-specific record and turns it into an ownership view before you commit.

Or enter the vehicle manually