Here's the proper procedure:
1. Diagnose the problem: This is the most crucial step. You need to find out *why* the CEL is on. You have a few options:
* OBD-II Scanner: Purchase a relatively inexpensive OBD-II scanner (available at most auto parts stores). These scanners will read the diagnostic trouble codes (DTCs) stored in your Sprinter's computer. The codes will give you a clue about the problem. You can then look up the codes online to get more information.
* Mechanic: Take your Sprinter to a qualified mechanic. They have the tools and expertise to diagnose the problem quickly and accurately. This is often the best and most reliable option, especially for a vehicle like a Sprinter.
2. Repair the problem: Once you know the cause of the CEL, you need to fix it. This might involve replacing a sensor, fixing a leak, or performing more extensive repairs.
3. Clear the code (after repair): *Only after you've repaired the problem* can you clear the code. Many OBD-II scanners have a "clear codes" function. Some advanced scanners even allow you to erase specific codes. After clearing the codes, drive the vehicle for a while to allow the OBD-II system to monitor the repair. The light might not immediately go off. If the problem is fixed, the CEL should not reappear. If it does, the repair was unsuccessful and you need further diagnosis.
Warning: Simply disconnecting the battery will often clear the code, but it won't fix the underlying problem. The CEL will likely reappear. This is a temporary fix and not recommended. It's crucial to address the root cause of the issue.
