Oxygen Sensor: A faulty oxygen sensor can cause irregular air-fuel mixtures in the engine.
Faulty Catalytic Converter: A malfunctioning catalytic converter may also cause the check engine light to stay on.
Airflow Meter: A faulty airflow meter can interfere with the accurate delivery of air to the engine.
Fuel System Issue: Problems such as a faulty fuel injector, fuel pressure regulator, or even low fuel pressure can turn on the check engine light.
Misfiring Issues: Cylinder misfires or problems in the ignition system, like faulty spark plugs or ignition coils, can also cause the light to turn on.
Temperature Sensors: Faulty temperature sensors, specifically coolant and intake air sensors, can trigger the light.
Exhaust Gas Recirculation: Issues related to the Exhaust Gas Recirculation system, such as faulty EGR valves or vacuum lines, can also be the culprit.
Transmission Issues: In automatic transmission models, problems with the transmission, such as sensor faults or internal mechanical issues, can cause the check engine light to come on.
The check engine light in a 1999 Daewoo Lanos serves as a warning indicator for various engine and emission-related problems. However, to accurately diagnose the cause, it's best to have the vehicle scanned with an OBD-II scanner or taken to a qualified mechanic who can identify and address the specific fault code that has activated the light.
