The check engine light is a warning light on your car's dashboard that indicates that something is wrong with the engine or emissions control system. It is usually accompanied by a diagnostic trouble code (DTC) that can be used to identify the specific problem.
Why does the check engine light come on?
The check engine light can come on for a variety of reasons, including:
* Engine misfires: An engine misfire occurs when one or more of the cylinders in your engine is not firing properly. This can be caused by a variety of factors, such as worn spark plugs, faulty ignition coils, or a bad fuel injector.
* Oxygen sensor problems: The oxygen sensor measures the amount of oxygen in the exhaust gases from your engine. If the oxygen sensor is not working properly, it can cause the engine to run rich or lean, which can lead to increased emissions and poor fuel economy.
* Catalytic converter problems: The catalytic converter converts harmful pollutants in the exhaust gases from your engine into less harmful substances. If the catalytic converter is not working properly, it can cause the engine to run rough and emit excessive pollutants.
* Evaporative emissions control system problems: The evaporative emissions control system prevents fuel vapors from escaping into the atmosphere. If there is a problem with the evaporative emissions control system, it can cause the check engine light to come on.
What should I do if the check engine light comes on?
If the check engine light comes on, it is important to have your car diagnosed by a qualified mechanic as soon as possible. The mechanic will be able to identify the specific problem and recommend the necessary repairs.
Ignoring the check engine light can lead to serious problems, such as:
* Engine damage: A problem that causes the check engine light to come on can damage your engine if it is not repaired.
* Increased emissions: A problem that causes the check engine light to come on can increase your car's emissions, which can lead to fines or even impounding of your vehicle.
* Poor fuel economy: A problem that causes the check engine light to come on can reduce your car's fuel economy.
