If your Service Engine light (CEL) is on *after* an oil change, the oil change itself didn't cause it. The light was already on, or something else triggered it during or after the oil change.
To address the CEL, you need to diagnose the underlying problem:
1. Check the OBD System: Take your Blazer to an auto parts store (like AutoZone, Advance Auto Parts, etc.). They usually offer free OBDII code reading services. This will give you a code (or codes) that indicate the problem. Note that a 1996 vehicle uses OBD I which might require a scan tool specific to that year and make.
2. Address the Problem: Once you have the code(s), you can research the meaning online or consult a repair manual. It could be something simple like a loose gas cap, or more complex like a sensor malfunction or emissions issue. Fixing the underlying problem will turn off the CEL.
3. Don't just reset the light: Simply resetting the CEL without fixing the problem is masking the issue and could lead to further damage to your vehicle.
In short, there's no "reset" for the CEL related to an oil change on a '96 Blazer. The light indicates a separate issue that needs to be diagnosed and repaired.
