Should I buy a 2014 Mercedes-Benz B-Class 1.8 Diesel Automatic?

Explore common problems, estimated repair costs and practical checks for the 2014 Mercedes-Benz B-Class 1.8 Diesel Automatic. 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

Automatic gearbox judder or hesitation

Jerky pull-away, shunting in traffic, delayed engagement into Drive or Reverse, or a lurch when creeping.

How to check

Pull away gently several times from a stop, then creep forward and reverse while parking.

Estimated Repair Cost

£1,200

2High Likelihood

EGR valve and intake soot build-up

Uneven idle, sluggish pickup, engine light, or repeated emissions-related faults that come back after being cleared.

How to check

Start from cold if possible, let it idle, then drive gently and accelerate from low revs.

Estimated Repair Cost

£650

3Moderate Likelihood

Injector leakback or seal failure

Diesel smell, chuffing at idle, rough cold start, or black crusty deposits around the injector area.

How to check

Start the engine from cold, let it idle with the bonnet open if the seller allows, then drive and stop again.

Estimated Repair Cost

£900

MOT Failure Rate

0%10%20%30%0–20,000 miles: 6.8% (106 failed / 1,554 tests)20,000–40,000 miles: 10.8% (659 failed / 6,111 tests)40,000–60,000 miles: 16.2% (998 failed / 6,153 tests)60,000–80,000 miles: 19.4% (817 failed / 4,208 tests)80,000–100,000 miles: 22.6% (515 failed / 2,282 tests)100,000–120,000 miles: 26.3% (280 failed / 1,063 tests)120,000–140,000 miles: 26.0% (103 failed / 396 tests)140,000–160,000 miles: 27.8% (45 failed / 162 tests)160,000–180,000 miles: 29.2% (21 failed / 72 tests)180,000–200,000 miles: 11.8% (2 failed / 17 tests)020k40k60k80k100k120k140k160k180k200kMilesFailure rate
2014 Mercedes-Benz B-Class 1.8 Diesel Automatic

Mercedes-Benz B-Class buying questions

Is a 2014 Mercedes-Benz B-Class worth buying?

It can be, but only if the individual car backs it up. For the 2014 Mercedes-Benz B-Class 1.8 Diesel Automatic, treat model-level patterns as viewing priorities and let condition, history and inspection evidence decide.

What common problems affect the Mercedes-Benz B-Class (2014)?

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 B-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