Here's what you should do:
1. Get the diagnostic trouble code (DTC): This is the key to understanding why the light is on. You have several options:
* OBD-II Scanner: The most reliable method. Buy a relatively inexpensive OBD-II code reader from an auto parts store or online. Plug it into the OBD-II port (usually under the dashboard) and it will retrieve the code(s). The code(s) will be a combination of letters and numbers (e.g., P0171).
* Auto Parts Store: Many auto parts stores will scan your vehicle for free. They'll give you the code(s) and may even offer suggestions.
* Mechanic: A mechanic will have the most advanced diagnostic tools and expertise. This is the best option if you're uncomfortable tackling car repairs yourself.
2. Research the DTC: Once you have the code(s), look them up online. Many websites (like websites dedicated to Dodge Ram forums) provide explanations of what the codes mean.
3. Address the problem: Based on the code(s), you can determine the issue causing the check engine light. This could range from something simple (like a loose gas cap) to something more complex (like a faulty sensor or a major mechanical problem). If you're not mechanically inclined, take it to a mechanic.
4. Clear the code (after fixing the problem): *Only after you've fixed the problem* can you clear the code. Many OBD-II scanners have a "clear codes" function. After clearing the code, drive the vehicle for a while to ensure the problem is truly resolved. The check engine light should stay off if the repair was successful. If it comes back on, the problem hasn't been fully resolved.
Important Note: Simply disconnecting the battery will sometimes clear the code, but this is only a temporary fix and doesn't address the root cause of the problem. The light will likely come back on. This is not recommended.
In short, clearing the check engine light is the last step, not the first. Focus on diagnosing and fixing the underlying issue.
