1. Oil pressure sensor: The oil pressure sensor is responsible for measuring the oil pressure in the engine. If the sensor is faulty, it can send a false signal to the ECU, which will then turn on the oil warning light and buzzer.
2. Oil pump: The oil pump is responsible for circulating oil throughout the engine. If the oil pump is faulty, it can't provide enough oil pressure to the engine, which will cause the oil warning light and buzzer to turn on.
3. Oil filter: The oil filter is responsible for removing contaminants from the oil. If the oil filter is clogged, it can restrict the flow of oil to the engine, which can cause the oil warning light and buzzer to turn on.
4. Oil level switch: The oil level switch is responsible for measuring the oil level in the engine. If the switch is faulty, it can send a false signal to the ECU, which will then turn on the oil warning light and buzzer.
5. Wiring: The wiring that connects the oil pressure sensor, oil pump, oil filter, and oil level switch to the ECU can also cause the oil warning light and buzzer to turn on. If the wiring is damaged or loose, it can prevent the ECU from receiving the correct signals, which will then cause the oil warning light and buzzer to turn on.
If you're not sure what the cause of the oil warning light and buzzer is, it's best to take your car to a mechanic to have it diagnosed and repaired.
