Use a error code reader, or disconnect the battery for 5 minutes or go in either AutoZone, Advance Auto Parts and they can do it for you.
PS: if you are going to disconnect the battery do not forget to write down a security code for your stereo (if it has one).
If you don't have an own error code reader. You can use a free service at Auto Zone. They can pull trouble codes out for you for free.
Are you asking how to clear engine trouble codes? You'll need a code scanner with a reset/erase feature.
pretty much instantly. As soon as the codes are cleared the check engine light goes off and vice versa, unless there still is trouble. In this case the codes won't clear until the trouble is repaired.
The check engine light is reset with a scan tool after repairing the failure that caused the trouble codes.
At home you can disconnect your neg. battery terminal for a few minutes then reconnect. Also, to find the codes (what kind of problem you have) go to Auto Zone and they will run a check for free (they say they won't clear the codes for you though).
After performing checking procedures on any OBD-II components, clear the PCM of all trouble codes by disconnecting the negative cable from the remote battery terminal for at least ten seconds.
Borrow, rent or buy a good quality OBD2 code scanner. The good ones let you clear the codes. Any codes that WON'T clear are usually caused by a failed component that needs to be replaced.
Disconnect the Battery. Negative prefered. Wait a couple minutes and reconnect. This will clear codes on 1994 and older. If the light comes back on, check the trouble codes and a repair may be needed.
Most likely one of sensors. Make sure that you do not have a manual override. Anyway you need to check the trouble codes. It will give a clue what to do next. Autozone can pull out codes for you for free.
check obd2 with scanner for trouble codes find problem, fix or replace sensor or part, clear codes with scan tool
Troublcodes.net Trouble Codes OBD & OBD2 Trouble Codes and Technical info & Tool Store. By BAT Auto Technical
Use a error code reader to erase trouble codes or disconnect the negative cable from the battery for 5-10 minutes.