Here's the proper procedure:
1. Diagnose the Problem: The first and most crucial step is to find out *why* the light is on. You have several options:
* OBD-II Scanner: This is the best approach. A relatively inexpensive OBD-II scanner (available at most auto parts stores) can read the diagnostic trouble codes (DTCs) stored by your vehicle's computer. These codes provide clues about the specific problem. Search online for "[your specific Colorado engine] DTC codes" to find explanations of the codes you get.
* Auto Parts Store: Many auto parts stores will scan your vehicle for free and tell you what the codes mean. They may also be able to advise on the necessary repairs.
* Mechanic: A qualified mechanic can diagnose and repair the issue properly. This is the most expensive option, but often the most reliable.
2. Repair the Problem: Once you know the cause of the CEL, address the underlying issue. This might involve replacing a faulty sensor, fixing a leak, or performing more extensive repairs.
3. Clear the Code (After Repair): *Only after you've successfully repaired the problem* can you clear the code. You can do this in a few ways:
* OBD-II Scanner: Most scanners have a function to clear trouble codes.
* Disconnect the Battery: Disconnecting the negative (-) battery terminal for about 10-15 minutes will often clear the code. However, this method is less reliable and may not work for all codes. Some modern vehicles require a specific procedure to clear codes and disconnecting the battery won't work.
Important Note: Simply clearing the code without fixing the problem will only temporarily turn off the light. The light will likely come back on, and the underlying problem could worsen. Always address the underlying issue before attempting to clear the Check Engine Light.
