If the code is not just crying "wolf", the normal/usual symptom is your idle speed being higher than normal.
Things you can look for/do:
Look for vacuum leaks anywhere/ same thing from behind the throttle body to the engine/ around the EGR.
Could just need a PCV valve.
If it is dirty, clean the throttle body (both sides of the throttle plate) with throttle body cleaner.
Look for and repair any emission lines/ hoses.
Your IAC (idle air control) may be on the "downhill".
If you are seemingly not having a problem, reset the code and see if it returns.
I hope this has helped you.
Sunday, June 11th, 2017 AT 9:03 PM