Check engine light is on
 

The light is on and the only thing that I have done to the car so far is the K&N air filter. HELP

You can push the OnStar button and have the rep run a diagnostic.

You can run to Autozone, Advanced Auto, O'Reilly, etc etc and they'll pull the code

Everyone who owns a car with ODB II should keep in mind that auto parts stores can pull codes for free for you. If they think you're gonna buy a part they'll even look it up for you.

You probably have a connection loose on the MAF or something, or a hose lose for the AIR pump (if it has one.. dunno yet..)

disconnect the battery for a few hrs, the MAF may need to re-learn.

K&N sets lean codes. Only the Typhoon doesn't. Call K&N and get a replacement.