The oxygen sensor monitors the amount of oxygen in the exhaust gas and sends a signal to the engine control unit (ECU) to adjust the air-fuel mixture. If the oxygen sensor fails, the ECU will not be able to properly control the air-fuel mixture, which can lead to a variety of problems, including:
* Engine misfires
* Increased fuel consumption
* Decreased engine performance
* Emissions problems
2. Catalytic Converter Failure
The catalytic converter converts harmful pollutants in the exhaust gas into less harmful substances. If the catalytic converter fails, these pollutants will be released into the atmosphere, which can cause:
* Smog
* Acid rain
* Health problems
3. Evaporative Emissions System Leak
The evaporative emissions system prevents fuel vapors from escaping from the fuel tank and entering the atmosphere. If there is a leak in the evaporative emissions system, fuel vapors will be released into the atmosphere, which can contribute to smog.
4. Engine Misfires
Engine misfires occur when one or more cylinders in the engine are not firing properly. This can be caused by a variety of problems, including:
* Spark plug problems
* Fuel injector problems
* Ignition coil problems
* Engine valve problems
Engine misfires can lead to:
* Increased fuel consumption
* Decreased engine performance
* Rough idling
* Engine knocking
5. Coolant Temperature Sensor Failure
The coolant temperature sensor monitors the temperature of the engine coolant and sends a signal to the ECU to adjust the engine's operation accordingly. If the coolant temperature sensor fails, the ECU will not be able to properly control the engine's temperature, which can lead to:
* Engine overheating
* Engine damage
6. Mass Air Flow Sensor Failure
The mass air flow sensor measures the amount of air entering the engine and sends a signal to the ECU to adjust the fuel injection accordingly. If the mass air flow sensor fails, the ECU will not be able to properly control the fuel injection, which can lead to:
* Engine misfires
* Increased fuel consumption
* Decreased engine performance
7. Throttle Position Sensor Failure
The throttle position sensor monitors the position of the throttle valve and sends a signal to the ECU to adjust the engine's operation accordingly. If the throttle position sensor fails, the ECU will not be able to properly control the engine's speed, which can lead to:
* Engine stalling
* Rough idling
* Decreased engine performance
8. Knock Sensor Failure
The knock sensor detects engine knocking and sends a signal to the ECU to adjust the engine's timing accordingly. If the knock sensor fails, the ECU will not be able to properly control the engine's timing, which can lead to:
* Engine damage
9. Oil Pressure Sensor Failure
The oil pressure sensor monitors the oil pressure in the engine and sends a signal to the ECU to adjust the engine's operation accordingly. If the oil pressure sensor fails, the ECU will not be able to properly control the engine's oil pressure, which can lead to:
* Engine damage
10. Transmission Problems
In some cases, an engine light can also be triggered by transmission problems. This is because the engine and transmission are closely linked, and a problem with one can affect the other. Transmission problems that can cause an engine light to come on include:
* Low transmission fluid
* Dirty transmission fluid
* Transmission filter problems
* Transmission solenoid problems
* Transmission gear problems
