I just got my car back running after about 2+ months of sitting. It was drivin from the repair shop straight home. While parked and sitting at idle I hear what sounds like a water pump sound from inside the car. It sounds like a liquid squish sound that goes on over and over. My check engine light came on so I hooked up my OBDII and it has a P0410 code. It describes it as "Generic" Secondary air injection system. I would say that the sound, sounds llike the water pump because it sounds like a pump trying to compress or push liquid. I have no idea, any help would be appreciated.