Theress usually a reason for a check engine light to come on....it tells you to bring it to a mechanic to get the engine checked lol. But you need a special $10,000 ODBII scanner that plugs into the cars computer which reads the codes and turns the light off. Most auto repair places has them (Honda dealer, Firestone, etc.) (Autozone will scan your car for free and tell you whats up but wont fix it lol