What does the Mercedes-Benz AAS fault mean?
2 Answers
This indicates an issue with the wheel speed sensor. Visit a 4S shop to clear the fault code - it's highly likely the sensor or its connector has become detached. The sensor is located in the steering knuckle of the front/rear wheels, inserted at a 45-degree angle. By disassembling the ball joint, you can check whether the connector has come loose. If left unresolved, this may eventually prevent the vehicle from moving, as the speed sensor transmits electronic signals to the main control unit along with throttle signals. Below is relevant information about wheel speed sensors: A wheel speed sensor measures the rotational speed of a vehicle's wheels. For modern automobiles, wheel speed data is essential - systems like Vehicle Dynamic Control (VDC), Electronic Stability Program (ESP), Anti-lock Braking System (ABS), and automatic transmission control all require wheel speed information. Therefore, the wheel speed sensor is one of the most crucial sensors in contemporary vehicles.
The Mercedes AAS malfunction I understand refers to an issue with the Mercedes' Adaptive Air Suspension system. You'll feel the car driving with severe bumps and wobbles, the vehicle height may be uneven on either side, and the dashboard frequently shows yellow or red warning lights. Main causes include air pump or pipeline leaks leading to loss of support; sensors covered in dust or aging misjudging height; and electronic control module failures, which are like a computer crash. These make driving unstable, especially during high-speed turns where accidents can easily occur. I recommend immediately using a diagnostic tool to read the fault codes without delay, then driving to a Mercedes dealership or professional repair shop for inspection, as they have original tools to replace parts. Ignoring it could damage shock absorbers or related electronic systems, resulting in higher repair costs. Regular maintenance like cleaning sensors and checking air pressure can prevent such issues.
