Why does the engine malfunction light come on and the vehicle shake?
1 Answers
When the engine malfunction light comes on and the vehicle shakes, the reason is poor combustion of the air-fuel mixture. Poor combustion can lead to carbon buildup in the engine, which is the primary cause of vehicle shaking. Additionally, when the oxygen sensor detects poor combustion and reports it to the ECU, the malfunction light is triggered as a warning. This is why the engine malfunction light and vehicle shaking often occur simultaneously. Several issues can cause poor combustion of the air-fuel mixture, including faulty spark plugs, malfunctioning ignition coils, fuel pump failure, or clogged fuel lines. If the engine malfunction light comes on, follow these steps: First, check whether the engine is running normally. Look for symptoms such as shaking, black smoke, or difficulty starting. If any of these issues are present, avoid restarting the engine. Note: If the red warning light is on, do not restart the engine under any circumstances. If the engine is running normally and the vehicle can be driven, visit a service center as soon as possible to diagnose the issue. A service center can easily read the trouble codes using a portable diagnostic tool, allowing for targeted repairs based on the fault information. If the engine is running normally, the owner can also try gently reconnecting wiring harness connectors, as a loose connection may be the cause. Alternatively, repeatedly turning the key to the ON position may help reset the system.
