* Loose or faulty gas cap: A loose or faulty gas cap can cause your check engine light to come on because it can allow fuel vapors to escape from your fuel tank. This can cause your car to run rich, which can damage your catalytic converter and other emissions control devices.
* Faulty oxygen sensor: An oxygen sensor monitors the amount of oxygen in your car's exhaust. If the oxygen sensor is faulty, it can send incorrect signals to your car's computer, which can cause your check engine light to come on.
* Faulty spark plugs or wires: Faulty spark plugs or wires can cause your car to misfire, which can damage your catalytic converter and other emissions control devices. This can also cause your check engine light to come on.
* Catalytic converter failure: A catalytic converter is a device that helps to convert harmful pollutants in your car's exhaust into less harmful substances. If the catalytic converter fails, it can cause your check engine light to come on.
* Evaporative emissions system leak: An evaporative emissions system leak can allow fuel vapors to escape from your car's fuel system. This can cause your car to run rich, which can damage your catalytic converter and other emissions control devices. This can also cause your check engine light to come on.
If your check engine light comes on, it's important to have your car diagnosed by a qualified mechanic as soon as possible. Ignoring a check engine light can lead to more serious problems and expensive repairs.
