The check engine light is on because the engine control module (ECM) senses a problem with the system.
First, need to find out and fix the problems. For example, running the vehicle out of fuel, which may causes the engine to misfire or the spark plugs need to be replaced.
Some local auto parts store can help you read the codes with the information to determine what needs to be done to fix the problems.
After you've properly diagnosed and fixed the problem that triggered the OBD trouble code, you can reset or clear the Check Engine / Service Engine Soon light by either disconnecting the battery or using a scan tool.
➊ Disconnecting the battery - It is the cheap, easy, free method. Simply disconnect your battery, turn on the headlight switch for about five to ten minutes, and re-connect the battery. Or disconnect the positive terminal of the battery only, wait 10-15 minutes, re-connect and the check engine light should be off (The car computer system has some time delayed reset). This is pretty simple, but will likely result in you losing your radio and clock presets and perhaps some other small things like that.
➋ Using a scan tool - Most scan tools have an option to clear or reset codes without the use of any tools or touching the battery. Consult the scan tool's manual for information on how to do it with your particular car model.
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