Mercedes-Benz E320 persistent check engine light activation upon starting the vehicle on Mercedes-Benz E320

Some Mercedes-Benz E320 owners report experiencing persistent check engine light issues upon starting their vehicle, often linked to a faulty oxygen sensor. This malfunction can lead to symptoms such as decreased fuel mileage, engine hesitation, misfiring, and rough idling. Additionally, problems with the exhaust gas oxygen sensor, also known as the Lambda probe, may cause irregular engine performance and misfires during acceleration or at low revs. Some owners have also identified a loose gas cap as a simple yet common trigger for the check engine light. If the oxygen sensor detects a drop in exhaust oxygen levels, it can illuminate the check engine light, prompting the need for a service appointment to address the issue. Regular maintenance and timely diagnostics are crucial for effectively resolving these concerns.