A Chevrolet needs an OBD II code reader to reset and turn off the "Service Engine Soon" light. OBD II stands for On-Board Diagnostics, Second Edition. This is the computer on board your vehicle that keeps track of all the mechanical functions within the Chevy. And OBD II code reader is also used to read the trouble codes in order to diagnose the exact problem with the vehicle. Usually, your mechanic will reset the Service Engine Soon light for you but not always. And if you are the one doing the servicing on your vehicle, you need to know how to manually reset this light.
Find the Diagnostic Link Connector, or DLC. This is usually found on the driver's side under the dashboard. Examine this port carefully to make sure it is the same size and shape as the connector end of your OBD II code reader.
Put the OBD II code reader's connector into the Diagnostic Link Connector. Put the key into the ignition and turn it to the "on" position. This will power the OBD II code reader.
Look for a key on the scanner that says "Delete" or "Erase." If you don't see this button, use the arrow keys on the faceplate of the scanner to scroll through the menu until you find a similar command. Select this command to erase the error codes. The scanner will display a message to indicate that the codes have been erased. If not, it will just return to the main menu.
Turn off the vehicle and wait one minute. Turn the key in the ignition and start the engine. Look on the instrument panel to make sure the service engine light has shut off.