Should I buy a 2015–2018 Audi A6 2.0 Diesel Automatic C7.5?

Explore common problems, estimated repair costs and practical checks for the 2015–2018 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

Automatic gearbox judder and expensive internal repair risk

Shudder when moving off, hesitation in traffic, jolts between gears, or a thump when selecting drive or reverse.

How to check

Pull away gently several times from a stop, then cruise at low speed and let it shift smoothly through the gears.

Estimated Repair Cost

£2,500

2High Likelihood

EGR valve and EGR cooler faults

Flat acceleration, rough running, engine light, uneven idle, excess smoke, or unexplained coolant loss.

How to check

Start from cold, let it idle briefly, then drive gently and accelerate from low revs in a higher gear.

Estimated Repair Cost

£900

3Moderate Likelihood

Coolant pump and thermostat faults

Coolant level dropping, heater taking too long to get warm, temperature gauge behaving oddly, or pink residue around the front of the engine.

How to check

Start from cold and drive normally until fully warm while watching the temperature gauge and cabin heat.

Estimated Repair Cost

£700

MOT Failure Rate

0%5%10%15%20%0–20,000 miles: 7.0% (434 failed / 6,219 tests)20,000–40,000 miles: 9.4% (4,311 failed / 45,660 tests)40,000–60,000 miles: 11.2% (6,898 failed / 61,808 tests)60,000–80,000 miles: 13.0% (7,100 failed / 54,676 tests)80,000–100,000 miles: 14.1% (5,424 failed / 38,484 tests)100,000–120,000 miles: 14.9% (3,349 failed / 22,453 tests)120,000–140,000 miles: 15.7% (1,889 failed / 12,047 tests)140,000–160,000 miles: 15.7% (958 failed / 6,087 tests)160,000–180,000 miles: 16.1% (470 failed / 2,915 tests)180,000–200,000 miles: 17.1% (229 failed / 1,339 tests)020k40k60k80k100k120k140k160k180k200kMilesFailure rate
2015–2018 Audi A6 2.0 Diesel Automatic C7.5

Audi A6 buying questions

Is a 2015–2018 Audi A6 worth buying?

It can be, but only if the individual car backs it up. For the 2015–2018 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 (2015–2018)?

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