Engine Malfunction Light On but Driving Normally with Vibration?
1 Answers
The engine malfunction light is on, accompanied by vehicle vibration, primarily due to poor combustion of the air-fuel mixture. Incomplete combustion can lead to carbon buildup in the engine, which is the most significant cause of vehicle vibration. Additionally, when the oxygen sensor detects and reports this poor combustion to the ECU, the malfunction light is triggered as a warning. Hence, the simultaneous occurrence of the engine malfunction light and vehicle vibration. Issues such as faulty spark plugs, defective ignition coils, malfunctioning fuel pumps, or clogged fuel lines can all contribute to poor combustion of the air-fuel mixture in the engine. If the engine malfunction light is on, follow these steps: First, check if the engine is running normally—look for signs like vibration, black smoke emission, or difficulty starting. If any of these symptoms are present, avoid restarting the engine. Note: Never restart the engine if the red warning light is illuminated. If the engine operates normally and the vehicle can be driven, proceed to a service station as soon as possible to diagnose the issue. Service technicians can easily retrieve trouble codes using a portable diagnostic tool, enabling targeted repairs based on the specific fault information. If the engine runs normally, the owner may also attempt to gently reconnect all wiring harness connectors, as a loose connection could be the culprit. Alternatively, repeatedly turning the key to the ON position might reset the system and clear the light.
