Here are some possible reasons why the check engine light might be on in your car:
* Loose or damaged gas cap: Make sure the gas cap is properly tightened. A loose or damaged gas cap can cause the check engine light to come on.
* Oxygen sensor issue: The oxygen sensor monitors the amount of oxygen in the exhaust gases. A faulty oxygen sensor can cause the check engine light to come on.
* Spark plug or ignition coil issue: A faulty spark plug or ignition coil can cause the check engine light to come on.
* Catalytic converter issue: The catalytic converter helps to reduce emissions. A faulty catalytic converter can cause the check engine light to come on.
* Evaporative emissions system issue: The evaporative emissions system helps to prevent fuel vapors from escaping into the atmosphere. A faulty evaporative emissions system can cause the check engine light to come on.
If you are not able to identify and fix the underlying issue yourself, you should take your car to a mechanic for diagnosis and repair.