P2259, but air pump is woking
 

I have a CEL P2259, but the air pump is working. When I start the car cold, the pump is running for a while and then stops. So does that mean that its not that big of a deal and I can wait to get this fixed? Or is the fact that the pump is running not the issue. (e.g. the pump is on, yet the hose that provides the air is not open?). What does this solenoid actually do with respect to the pump?