Should I buy a 2018 Mercedes-Benz A-Class 1.5 Diesel Automatic W176 facelift?

Explore common problems, estimated repair costs and practical checks for the 2018 Mercedes-Benz A-Class 1.5 Diesel Automatic 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

1High Likelihood

AdBlue / NOx sensor faults causing warning countdowns

Engine light, AdBlue warning, restart countdown, or reduced power after the warning appears.

How to check

Start the car from cold, let it idle, then drive until fully warm and watch the dash for emissions warnings.

Estimated Repair Cost

£1,200

2High Likelihood

Automatic gearbox hesitation, jerking or limp-home faults

Jerky pull-away, delayed response when reapplying throttle, harsh shifts, or a gearbox warning with reduced gear selection.

How to check

Pull away gently several times, crawl in traffic speed, then slow for a roundabout and accelerate again.

Estimated Repair Cost

£1,500

3Moderate Likelihood

EGR flow faults and low-speed stutter

Stutter at low speed, uneven pickup, engine light, or a car that feels smoother once fully hot than when cold.

How to check

Drive gently through town speeds, then accelerate progressively from low revs once the engine is warm.

Estimated Repair Cost

£800

MOT Failure Rate

0%10%20%30%40%0–20,000 miles: 8.4% (789 failed / 9,401 tests)20,000–40,000 miles: 12.0% (4,133 failed / 34,437 tests)40,000–60,000 miles: 14.8% (4,451 failed / 30,044 tests)60,000–80,000 miles: 17.1% (2,654 failed / 15,555 tests)80,000–100,000 miles: 18.1% (1,003 failed / 5,528 tests)100,000–120,000 miles: 19.4% (307 failed / 1,585 tests)120,000–140,000 miles: 20.8% (85 failed / 408 tests)140,000–160,000 miles: 17.7% (22 failed / 124 tests)160,000–180,000 miles: 20.5% (8 failed / 39 tests)180,000–200,000 miles: 33.3% (6 failed / 18 tests)020k40k60k80k100k120k140k160k180k200kMilesFailure rate
2018 Mercedes-Benz A-Class 1.5 Diesel Automatic W176 facelift

Mercedes-Benz A-Class buying questions

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

It can be, but only if the individual car backs it up. For the 2018 Mercedes-Benz A-Class 1.5 Diesel Automatic 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 (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