What does it mean when the engine malfunction indicator light flashes and there is shaking?

[Olga]

When the engine malfunction light is on and the vehicle body shakes, the cause is poor combustion of the air-fuel mixture. Poor combustion of the air-fuel mixture can lead to carbon buildup in the engine, which is the most significant reason for 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 occur simultaneously. Issues such as faulty spark plugs, defective ignition coils, malfunctioning fuel pumps, or clogged fuel lines can all cause 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 shaking, black smoke emission, or difficulty starting. If any of these symptoms are present, avoid restarting the engine. Note: Do not restart the engine if the red warning light is on. If the engine is running normally and the vehicle can be driven, proceed to a service station as soon as possible to diagnose the issue. A service station 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 various wiring harness connectors, as a loose connection might be the cause. Alternatively, repeatedly turning the key to the ON position may help reset the system.