I have the error code P0505. Prior postings seem to indicate it is the Idle Control Valve. However, I am unclear when looking at pictrures, it appears there is a "black box" with some type of "flutter valve" that is in front of the ICV. Is this the case? I also get the error codes P0171 and P0174, which talk about Bank 1 and then Bank 2 being to lean. What are Bank 1 and Bank 2?