What Causes the Engine Warning Light to Illuminate and Shaking in a New Mercedes-Benz?
1 Answers
Engine warning light illumination accompanied by vehicle shaking is primarily due to poor combustion of the air-fuel mixture. Poor combustion leads to engine carbon buildup, which is the most significant cause of vehicle shaking. Additionally, when the oxygen sensor detects poor combustion and reports it to the ECU, the warning light is triggered as an alert. Hence, the simultaneous occurrence of the engine warning light and vehicle shaking. Issues such as faulty spark plugs, defective ignition coils, malfunctioning fuel pumps, or clogged fuel lines can all result in poor combustion of the air-fuel mixture. If the engine warning light illuminates, follow these steps: First, check if the engine is operating normally—whether there is shaking, black smoke emission, or difficulty starting. If any of these symptoms are present, avoid restarting the engine. Note: Under no circumstances should you restart the engine if the red warning light is on. If the engine operates normally and the vehicle can be driven, proceed to a service center as soon as possible to diagnose the issue. Service centers can easily read the fault codes using a portable diagnostic tool, allowing for targeted repairs based on the fault information. If the engine runs normally, the owner may also try gently reseating all wiring harness connectors, as a loose connection could be the cause. Alternatively, repeatedly turning the key to the ON position might reset the warning light.
