Should I buy a 2018 Mercedes-Benz B-Class 1.6 Petrol Manual?

Explore common problems, estimated repair costs and practical checks for the 2018 Mercedes-Benz B-Class 1.6 Petrol Manual. 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

Timing chain and cam adjuster wear

Cold-start rattle for a second or two, rough running, hesitant acceleration, or an engine warning light.

How to check

Start the engine from fully cold and then drive gently at low revs for the first few minutes.

Estimated Repair Cost

£2,800

2Moderate Likelihood

Intake valve carbon build-up

Uneven idle, hesitant pull-away, reduced smoothness, or occasional misfire without an obvious simple cause.

How to check

Let it idle from cold, then drive gently through town speeds and accelerate smoothly from low revs.

Estimated Repair Cost

£700

3High Likelihood

Battery drain and low-voltage electrical faults

Slow cranking, warning messages that come and go, stop-start not working, or electrical features behaving inconsistently.

How to check

Start the car, use lights, blower, screen functions, and then restart it after the drive.

Estimated Repair Cost

£450

MOT Failure Rate

0%10%20%30%0–20,000 miles: 7.4% (289 failed / 3,915 tests)20,000–40,000 miles: 10.3% (511 failed / 4,982 tests)40,000–60,000 miles: 14.1% (221 failed / 1,571 tests)60,000–80,000 miles: 19.7% (82 failed / 416 tests)80,000–100,000 miles: 18.5% (20 failed / 108 tests)100,000–120,000 miles: 22.7% (5 failed / 22 tests)120,000–140,000 miles: 12.5% (1 failed / 8 tests)140,000–160,000 miles: 0.0% (0 failed / 1 tests)020k40k60k80k100k120k140k160k180k200kMilesFailure rate
2018 Mercedes-Benz B-Class 1.6 Petrol Manual

Mercedes-Benz B-Class buying questions

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

It can be, but only if the individual car backs it up. For the 2018 Mercedes-Benz B-Class 1.6 Petrol Manual, treat model-level patterns as viewing priorities and let condition, history and inspection evidence decide.

What common problems affect the Mercedes-Benz B-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 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