1. Get the Diagnostic Trouble Code (DTC): This is the crucial first step. The check engine light indicates a specific problem (or multiple problems) stored as a code in the car's computer. You have a few options:
* Auto Parts Store: Most auto parts stores (like AutoZone, Advance Auto Parts, etc.) will scan your car's OBD-II system for free and give you the DTC. They can often even give you a basic interpretation of the code.
* OBD-II Scanner: You can buy a relatively inexpensive OBD-II code reader for your own use. These plug into your car's diagnostic port (usually under the dashboard) and display the DTCs.
* Mechanic: A mechanic will definitely be able to read the codes.
2. Interpret the DTC: Once you have the code (e.g., P0171, P0420), you can look it up online. Many websites and forums (like forums dedicated to Dodge Stratus) provide explanations of what different codes mean. This will give you a clue about the potential problem.
3. Address the Problem: Based on the DTC, you can decide how to proceed:
* Minor Issue (Potentially): Some codes might indicate a simple fix, like a loose gas cap (common cause of P0440 codes). Tightening the gas cap and clearing the code (with a scanner) might resolve the issue.
* Serious Issue: Many codes point to more complex problems requiring professional attention, such as issues with the oxygen sensor, catalytic converter, mass airflow sensor, or other engine components.
* DIY Repair: If you're mechanically inclined and comfortable working on your car, you might attempt a repair based on the DTC. However, be sure you understand the repair before attempting it and have the correct tools and parts.
* Mechanic: If you're not comfortable fixing it yourself, take your Stratus to a qualified mechanic for diagnosis and repair. They'll be able to accurately diagnose the problem and fix it properly.
Important Considerations for a 2002 Dodge Stratus:
* Age of the Vehicle: Being a 2002 model, your Stratus is older, and certain components might be nearing the end of their lifespan. The problem might be related to wear and tear.
* Maintenance History: Knowing the maintenance history of your car will help determine if the issue is related to a lack of preventative maintenance.
Ignoring the check engine light can lead to more extensive (and expensive) damage. Getting the code and addressing the underlying problem promptly is the best course of action.
