Here's what you should do:
1. Get the diagnostic trouble codes (DTCs) read: This is the crucial first step. You can do this in a few ways:
* Auto parts store: Most auto parts stores (like AutoZone, Advance Auto Parts, etc.) will read the codes for free. They'll give you a printout with the codes.
* OBD-II scanner: You can buy a relatively inexpensive OBD-II scanner for your smartphone or computer. These will read and sometimes even clear the codes.
* Mechanic: A mechanic will have a professional-grade scanner and can read the codes and provide a diagnosis.
2. Interpret the codes (or have a mechanic interpret them): The codes are alphanumeric and correspond to specific problems. Knowing the codes is essential for understanding what's wrong. Online resources can help you decipher the codes, but a mechanic will be able to give you a much more accurate interpretation.
3. Address the underlying problem: Once you know the DTCs, you can begin to address the root cause. This could range from something simple (like a loose gas cap) to something more complex requiring repairs. Don't just clear the codes without addressing the underlying issue – the light will likely come back on.
Possible causes (completely unrelated to the oil change):
* Oxygen sensor: A common issue in older cars.
* Mass airflow sensor: Another frequent culprit.
* Catalytic converter: This can be expensive to replace.
* Spark plugs or wires: Worn-out spark plugs can cause misfires.
* Other sensor issues: Various sensors throughout the engine monitor its performance and can trigger the check engine light if malfunctioning.
In short: Don't ignore the check engine light. Get the codes read and address the underlying issue to prevent further damage to your car. Attempting repairs yourself without knowing the problem could lead to more costly issues later on. A mechanic is the best bet for a proper diagnosis and repair if you aren't comfortable working on your car yourself.
