The MBUX Revolution and Its Flaws
The defining feature of the W177 is undoubtedly the twin-screen MBUX infotainment system. While it remains one of the best in class, early versions from 2018 and 2019 are prone to software glitches, including random reboots and freezing. Ensuring the car has received the latest firmware updates during its service is essential.
Beyond software, some owners have reported rattles from the screen assembly itself and the surrounding plastics. During a test drive, listen for vibrations when driving over rougher surfaces, as these can be annoying and difficult to rectify without dismantling the dashboard.
- Test 'Hey Mercedes' voice control for responsiveness.
- Check for bubbling or delamination on the glass screen surfaces.
- Verify that both screens have consistent brightness and no dead pixels.
Engine & Drivetrain: Renault vs. Mercedes
It's a common 'fact' that the entry-level A-Class engines (A180 and A200) are built by Renault. While this is true for the base block, Mercedes adds its own turbochargers, electronics, and engine mapping. These 1.33L engines are generally robust but have seen some issues with high-pressure fuel pumps and carbon buildup on higher-mileage cars.
The Mercedes-built 2.0L engines (A220 and A250) are smoother and offer more power, but they can be thirstier and carry higher insurance costs. Regardless of the engine, the 7-speed dual-clutch transmission (DCT) is the most critical mechanical component to monitor.
- Listen for a 'metallic ticking' from the high-pressure fuel pump.
- Check for coolant residue around the thermostat housing.
- Test the gearbox for clunky downshifts when coming to a stop.
Chassis and Daily Reliability
The W177 offers a much more comfortable ride than its predecessor, the W176, but it is still on the firmer side of the hatchback segment. The suspension is generally reliable, but the complex multi-link rear setup on higher-powered models requires inspection as the car ages.
Brake sensor warnings are a common nuisance, often caused by dirt ingress or failing ABS sensors rather than actual brake wear. Electronics throughout the car—from the touch-capacitive steering wheel buttons to the ambient lighting—should be tested individually during an inspection.
- Inspect the tyre wear patterns—misalignment is common on the 'Sport' trims.
- Verify the functioning of the rear-view camera (it's motorized and can stick).
- Check the keyless entry sensors on all door handles.