Why Does the Engine Light Come On After an Oil Change?
1 Answers
Reasons for the engine light coming on after an oil change: 1. Poor combustion of the air-fuel mixture: Faulty spark plugs, ignition coils, fuel pump, or clogged fuel lines can all lead to poor combustion of the air-fuel mixture in the engine. Poor combustion results in engine carbon buildup or knocking issues, which are detected by the engine's oxygen sensor and reported to the ECU, triggering the warning light. 2. Sensor issues: These include the coolant temperature sensor, crankshaft position sensor, air flow sensor, intake air temperature sensor, and oxygen sensor. When these sensors are damaged, have poor contact, or experience signal interruption, the car's ECU cannot accurately obtain engine data, causing the engine warning light to illuminate. It is advisable to visit a repair shop promptly for inspection. 3. Oil quality issues: The fuel used in cars usually has a specific grade, and engine oil can be either semi-synthetic or fully synthetic. Manufacturers typically recommend which fuel grade and type of oil to use. If the owner fails to follow these recommendations, prolonged use can lead to engine wear and trigger the warning light. 4. Carbon buildup issues: Over time, carbon deposits inevitably accumulate inside the engine. These deposits can alter the engine's design parameters and, due to their unstable nature and heat retention, can cause uncontrolled ignition, leading to engine knocking. In such cases, the engine warning light will also come on.
