* Check Engine Light (CEL): You can't reset the CEL with a button. You need to fix the underlying problem that caused the light to come on. A scan tool can clear the code *after* the problem is resolved.
* Trip Odometer: This usually involves a button or sequence of button presses on the instrument cluster (the area with the speedometer and gauges). Consult your owner's manual for the specific instructions.
* Radio presets: This is usually a button on the radio itself, often labeled "preset" or similar.
* Other systems: Other systems might have their own reset procedures, depending on the system.
To help me give you a more precise answer, please specify *what* you are trying to reset.
