Should I buy a 2021 Mercedes-Benz A-Class 1.3 Petrol Automatic W177?

Explore common problems, estimated repair costs and practical checks for the 2021 Mercedes-Benz A-Class 1.3 Petrol Automatic W177. 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 hesitant low-speed take-up

Jerky creep, hesitation pulling away, or a thumpy shift when moving off from cold or in traffic.

How to check

Pull away gently several times from a stop, then creep in slow traffic or while parking.

Estimated Repair Cost

£1,800

2High Likelihood

MBUX screen blackouts and repeated reboots

The display stays black on startup, reboots by itself, or loads slowly with missing functions.

How to check

Start the car from cold and use the screen, camera and media during a short drive.

Estimated Repair Cost

£600

3Moderate Likelihood

Water ingress into boot or rear footwell

Musty smell, persistent condensation, damp carpet, wet boot floor, or unexplained electrical oddities after rain.

How to check

After the drive, open the boot and lift the floor panels, then feel the carpet edges in the rear footwell area.

Estimated Repair Cost

£700

MOT Failure Rate

0%20%40%60%80%100%0–20,000 miles: 5.4% (369 failed / 6,794 tests)20,000–40,000 miles: 8.7% (1,147 failed / 13,182 tests)40,000–60,000 miles: 11.9% (498 failed / 4,172 tests)60,000–80,000 miles: 14.1% (103 failed / 732 tests)80,000–100,000 miles: 14.9% (25 failed / 168 tests)100,000–120,000 miles: 16.7% (6 failed / 36 tests)120,000–140,000 miles: 20.0% (2 failed / 10 tests)140,000–160,000 miles: 0.0% (0 failed / 1 tests)160,000–180,000 miles: 100.0% (1 failed / 1 tests)180,000–200,000 miles: 0.0% (0 failed / 2 tests)020k40k60k80k100k120k140k160k180k200kMilesFailure rate
2021 Mercedes-Benz A-Class 1.3 Petrol Automatic W177

Mercedes-Benz A-Class buying questions

Is a 2021 Mercedes-Benz A-Class worth buying?

It can be, but only if the individual car backs it up. For the 2021 Mercedes-Benz A-Class 1.3 Petrol Automatic W177, treat model-level patterns as viewing priorities and let condition, history and inspection evidence decide.

What common problems affect the Mercedes-Benz A-Class (2021)?

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