Service engine soon light is on?

Lean codes.

Could be vacuum leak, pcv valve, mass air flow sensor or low fuel pressure. You need to have the long term trims monitored to help with determining the failure

Roy

That means the Engine Computer detected a problem and set a diagnostic fault code in memory. Many auto parts stores will read those codes for you for free. That will get you into the circuit or system with the problem, not necessarily the defective part.

You will have to get a scan done, as you will first have to repair the fault that the code indicates, if you just clear the code it will re set again.

Mark (mhpautos)