Check engine light stays on on 2005 Chevrolet Equinox

After changing the oil, I got a check engine light. I have no faults according to my scanner and it erases the computer. However, the light is still on?

Asked by for the 2005 Chevrolet Equinox
Turn the key to on position but dont crank the Vehicle. Push gas pedal 3 times, light should go out.
4 answers
If the check engine light is on, there must be a code, check the engine and transmission control modules. You may have a scanner that doesn't work on this vehicle, try to use another one.
REBOOT THE BATTERIES TAKE THE CABLE OFF AND PUT BACK IT HAPPEN TO ME TWICE
Turned out to be the catalytic converter bad. Thank you all for your ideas and suggestions.