The check engine light means that something is going wrong with the engine, electric, or emissions part of your vehicle. it will need to be hooked to a scanner to find out what the trouble codes are. Usually Autozone will scan and give you the codes for free. get them and post them here and i will try to help you with the diagnostics

Usually it will be emissions related . Get the vehicle fault code read to determine the fault . More than likely a oxygen sensor fault .