There are many different reasons why the Check Engine light may come on, some more serious than others. Here are a few of the most common causes:
* Loose or damaged gas cap: A loose or damaged gas cap can cause the Check Engine light to come on because it can allow fuel vapors to escape from the fuel tank, which can lead to an increase in emissions.
* Oxygen sensor: The oxygen sensor monitors the amount of oxygen in the exhaust gas and helps the engine control module (ECM) adjust the air-fuel mixture. A faulty oxygen sensor can cause the engine to run rich or lean, which can lead to an increase in emissions.
* Spark plugs: Spark plugs are responsible for igniting the air-fuel mixture in the engine. Faulty spark plugs can cause the engine to misfire, which can lead to an increase in emissions.
* Catalytic converter: The catalytic converter helps to reduce harmful emissions from the exhaust gas. A faulty catalytic converter can cause the Check Engine light to come on because it is not able to properly clean the exhaust gas.
If your Check Engine light is on, it is important to have your vehicle inspected by a qualified mechanic as soon as possible. Driving with a Check Engine light on can damage your vehicle's engine and emission control system, and can also lead to an increase in emissions.
