Mercedes-Benz E350 shaking at idle with flashing check engine light, possible spark plugs or EGR valve issue on Mercedes-Benz E350

Some Mercedes-Benz E350 owners report experiencing shaking at idle accompanied by a flashing check engine light, which may indicate potential issues with the spark plugs or the EGR (Exhaust Gas Recirculation) valve. These symptoms can arise from worn or faulty spark plugs, leading to engine misfires that cause the shaking and trigger the check engine light. Additionally, a malfunctioning EGR valve can disrupt the flow of exhaust gases, resulting in rough idling and also activating the check engine light. It is crucial for owners to address these issues promptly to prevent further engine damage and ensure optimal performance, and seeking a professional mechanic for accurate diagnosis and necessary repairs is highly recommended.