What does it mean when the yellow light on the car is on?
1 Answers
The reasons for the yellow warning light on a car are as follows: 1. Sensor issues: The sensors mentioned here include coolant temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or experience signal interruption, the car's ECU cannot accurately obtain engine data, which will trigger the engine warning light. 2. Maintenance issues: Poor engine maintenance is the most common cause of the engine warning light. Vehicles have specific maintenance cycles. If the owner fails to perform maintenance on schedule and has poor driving habits, it will increase the burden on the engine operation, ultimately prompting the warning light to remind the owner of maintenance. 3. Fuel quality issues: The fuel quality mentioned here includes both fuel and engine oil. The fuel added to a car usually has a specific grade, and engine oil can be semi-synthetic or fully synthetic. Manufacturers generally recommend which grade of fuel and type of engine oil to use. If the owner does not follow these recommendations, long-term use can cause engine wear, leading to the warning light turning on. 4. Poor combustion of the air-fuel mixture: Faulty spark plugs, ignition coils, fuel pumps, or clogged fuel lines can all cause poor combustion of the air-fuel mixture in the engine. Poor combustion leads to engine carbon buildup or knocking issues, which are eventually detected by the engine's oxygen sensor and reported to the ECU, triggering the warning light as a warning. 5. Air intake issues: The engine requires air intake during combustion, and the air filter plays a crucial role in this process. If the car's air filter is dirty and not cleaned regularly, it can affect the air intake. Over time, this can lead to blockages, and in severe cases, it will cause the engine warning light to turn on.
