Here's what you should do:
1. Get the Diagnostic Trouble Codes (DTCs) Read: This is the most crucial step. The check engine light is triggered by a stored code(s) indicating a specific problem. You have several options:
* OBD-II Scanner: Buy a relatively inexpensive OBD-II scanner from an auto parts store. These plug into your car's OBD-II port (usually under the dashboard) and read the codes. Many scanners also provide definitions of the codes.
* Auto Parts Store: Most auto parts stores will read the codes for free. Just be aware that they may try to sell you parts based on the code, so be prepared to get a second opinion if you're unsure.
* Mechanic: A mechanic will have the best tools and expertise to diagnose the problem accurately.
2. Interpret the Codes: Once you have the DTCs, look up their meaning online (many websites provide code definitions). This will give you a better idea of the potential problem.
3. Address the Problem: Depending on the codes, the solution might be simple (like tightening a gas cap) or more complex (requiring repairs). Consider:
* Simple Fixes: If the code suggests a loose gas cap, replace or tighten it. Clear the code after a few driving cycles (driving for a while) and see if the light returns.
* Minor Repairs: Some problems might require replacing a sensor (e.g., oxygen sensor, mass airflow sensor) or other relatively inexpensive parts.
* Major Repairs: In some cases, the problem could be more significant and require professional repair.
Important Considerations:
* Ignoring the light is risky. While the car might seem to run fine now, the underlying problem could get worse, leading to more expensive repairs, reduced fuel efficiency, or even damage to the catalytic converter.
* Get multiple opinions if necessary. Don't hesitate to get a second opinion from a different mechanic if you're unsure about a diagnosis or repair estimate.
* Don't just clear the code without fixing the problem. Clearing the code without addressing the underlying issue will only temporarily turn off the light; the problem will likely return.
In short, getting the DTCs read is the first and most important step. That information will guide you towards the proper solution.
