I threw a code tyoday. P1416. It says it is Air systems bank 2

No idea what that is? I changed the transmission filter, replaced the fluid. Changed oil and filter, replaced fluid, drained radiator, flushed it, repalced fluid with Dexron 3 like I was supposed to. In the middle of the running of the car, during the flush part is when I noticed the light come on. Any idea what this is? Let me know. Thanks.

1998 Chevrolet Camaro Z28, with 55,000 miles on it. Automatic A4.

 

Air Pump checkvalves, They are pretty cheap to replace.

 

Went to the dealer today and they said the same thing, but it also could be a o2. So i'm back to square 1. One thing I noticed My ses goes off after a long ride. I hate headaches.

 

Mine just did the same thing and I took it to Auto Zone and it read P1416. It says "Port air circuit malfunction". I had heard it might be the O2 sensor. So I took it to a shop and that is not it. Hmmmmmmmm Any other suggestion would be great.

Thanks