What Does It Mean When the Engine Yellow Light on the Car Dashboard Comes On?
1 Answers
There are two scenarios when the engine yellow light on the car dashboard comes on: 1. When the car's power is turned on, the vehicle undergoes a self-check. During this time, not only the engine yellow light but also other warning lights will illuminate, and then they will all turn off. This is a normal phenomenon. 2. If the engine fault yellow light remains on after the car is started, this indicates that the ECU is alerting you to an engine fault, which is an abnormal condition. Possible causes for the engine yellow light being on include: 1. Poor combustion of the air-fuel mixture: Issues such as faulty spark plugs, malfunctioning ignition coils, defective fuel pumps, or clogged fuel lines can lead to poor combustion. Poor combustion can result in engine carbon buildup or knocking, which are eventually detected by the engine's oxygen sensor. The ECU then activates the warning light. 2. Sensor malfunctions: Sensors such as the coolant temperature sensor, crankshaft position sensor, air flow sensor, intake air temperature sensor, and oxygen sensor may become damaged, have poor connections, or experience signal interruptions. When this happens, the car's ECU cannot accurately obtain engine data, triggering the engine warning light. 3. Air intake problems: A dirty or clogged air filter that hasn't been cleaned regularly can affect the car's air intake, potentially causing blockages. In severe cases, this may lead to the engine warning light turning on.
