Mercedes-Benz E320 Secondary Air Injection Pump Failure with Check Engine Light and Noise Issues on Mercedes-Benz E320

Some Mercedes-Benz E320 owners report experiencing secondary air injection pump failures, which are often indicated by the illumination of the check engine light on the dashboard. These issues may also manifest as rough or inconsistent engine idling, attributed to improper air injection. Additionally, owners have noted decreased fuel efficiency linked to a malfunctioning secondary air injection system. To diagnose these problems, it is recommended to check the operation of the secondary air pump using a Mercedes-Benz scan tool or by observing its function at engine startup. A visual inspection of the air pump and check valves for unusual conditions is crucial, as any damage or wear may necessitate replacement. Furthermore, a blown fuse could indicate the need for pump replacement. In some cases, resolving the P0410 code and related issues may require assistance from a Mercedes-Benz service center, where various repairs may be needed to clear the code and address the underlying problem.