Why is the yellow light on in Toyota Corolla?

[StAdriel]

Toyota Corolla yellow light on reasons are as follows: Damaged sensors: Sensors include water temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or signal interruption, the car's ECU cannot accurately obtain engine data, which will cause the engine fault light to come on. Poor engine maintenance: Poor engine maintenance is the most common cause of engine fault light illumination. Vehicles have a certain maintenance cycle. If the owner does not perform maintenance on schedule, coupled with poor driving habits, it will increase the burden on engine operation, and eventually the fault light will come on as a reminder. Poor oil quality: Oil quality includes fuel and engine oil. The fuel injected into the car generally has a grade. The manufacturer usually recommends which grade of fuel and which type of engine oil the owner should use. If the owner does not add as required, it will trigger an alarm over time.