Here's what you should do:
1. Don't Panic: The check engine light doesn't automatically mean your car is going to explode. It's a warning signal, and you should address it, but most likely, you can still drive the car safely.
2. Read the Code: The most important step is to get the code that triggered the light. You can use an OBD-II code reader (available at auto parts stores and online), or take your car to a mechanic. The code will give you a clue as to what's wrong.
3. Address the Issue: Once you know the code, you can research the possible causes online or consult with a mechanic. Some common causes include:
* Loose Gas Cap: This is the most common reason for the check engine light to come on. Tighten your gas cap, and the light may go out after a few driving cycles.
* Oxygen Sensor: These sensors monitor the air/fuel mixture in the engine and can fail over time.
* Catalytic Converter: A faulty catalytic converter can cause performance issues and emissions problems.
* Spark Plugs/Wires: Worn or damaged spark plugs and wires can also trigger the light.
4. Don't Ignore It: While the light doesn't always mean a major problem, ignoring it could lead to more serious issues down the line. It's always best to have it checked out as soon as possible.
Important Note: It's impossible to know the exact cause of your check engine light without the code. A qualified mechanic can properly diagnose and fix the issue.
