Mercedes-Benz C230 motor knocking issue on Mercedes-Benz C230

Some Mercedes-Benz C230 owners report experiencing engine knocking issues that may indicate serious underlying problems with the engine. Common symptoms include a knocking noise after starting a cold engine, reduced performance, poor mileage, and hesitation while idling. This knocking noise can escalate if not addressed promptly, potentially leading to further engine damage. For instance, some owners of the 2005 Mercedes-Benz C230 Kompressor have reported the engine light illuminating, rough running, and specific error codes like PO302 and PO128 associated with the knocking. Regular maintenance, including adhering to the manufacturer's recommended schedule for oil changes, air filter replacements, and spark plug inspections, is crucial for preventing such engine issues and ensuring optimal performance.