Check engine light

If the fault causing the check engine light is repaired then the light will eventually go off. Briefly disconnecting the battery may or may turn off the light, but if the fault still exists the light will come back on. Code reader will erase the trouble code, but again if the fault is not repaired the light will come back on.

The change oil light I think all you do is turn the ignition switch on then punch and release the accelerator pedal 3 times the lite will go out