That's the eacv code. The electronic air control valve is located right behind the intake manifold. It's like a little cylinder with a plug in it. Make sure that it's plugged in firmly, then check for power. If it has power, then check the resistance, it should read between 8-15ohms. If it's out of range, then u need to replace the sensor, if it's in range, then u may need to just clean out the valve.
I can't remember how to clean it, but I think there was a thread on here somewhere that described how to do it.