Should I buy a 2016–2018 Mercedes-Benz A-Class 2.1 Diesel Manual W176 facelift?

Explore common problems, estimated repair costs and practical checks for the 2016–2018 Mercedes-Benz A-Class 2.1 Diesel Manual W176 facelift. Use this guide to help assess a used car, then unlock a personalised report for the exact vehicle you're considering.

Common problems

1Moderate Likelihood

DPF loading and failed regenerations

Engine warning light, reduced power, cooling fan running after switch-off, poor fuel economy, or repeated limp mode after town use.

How to check

Warm it fully, then drive at steady A-road speed and follow with a few firm accelerations.

Estimated Repair Cost

£900

2Moderate Likelihood

NOx sensor and AdBlue system faults

Engine warning light, AdBlue messages, inability to read AdBlue level, or a car that drives normally but keeps logging emissions faults.

How to check

Start the car from cold and drive until fully warm while watching for warning messages.

Estimated Repair Cost

£900

3Moderate Likelihood

Injector return-line and fuel leak issues

Diesel smell around the car, dampness around the top/front of the engine, longer cranking, or occasional rough running after standing.

How to check

Start it from cold, let it idle, then stop after the drive and stand by the front of the car for a moment.

Estimated Repair Cost

£450

MOT Failure Rate

0%10%20%30%0–20,000 miles: 8.2% (985 failed / 11,947 tests)20,000–40,000 miles: 11.5% (6,631 failed / 57,458 tests)40,000–60,000 miles: 14.7% (8,752 failed / 59,339 tests)60,000–80,000 miles: 17.6% (6,866 failed / 39,069 tests)80,000–100,000 miles: 20.0% (3,769 failed / 18,887 tests)100,000–120,000 miles: 22.1% (1,574 failed / 7,134 tests)120,000–140,000 miles: 22.4% (561 failed / 2,503 tests)140,000–160,000 miles: 24.1% (193 failed / 802 tests)160,000–180,000 miles: 24.7% (61 failed / 247 tests)180,000–200,000 miles: 24.4% (19 failed / 78 tests)020k40k60k80k100k120k140k160k180k200kMilesFailure rate
2016–2018 Mercedes-Benz A-Class 2.1 Diesel Manual W176 facelift

Mercedes-Benz A-Class buying questions

Is a 2016–2018 Mercedes-Benz A-Class worth buying?

It can be, but only if the individual car backs it up. For the 2016–2018 Mercedes-Benz A-Class 2.1 Diesel Manual W176 facelift, treat model-level patterns as viewing priorities and let condition, history and inspection evidence decide.

What common problems affect the Mercedes-Benz A-Class (2016–2018)?

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 a Mercedes-Benz A-Class?

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