OBD II Error Codes P1086, P1084, P0172, P0175

[AceWynn]

Hey Guys,

My Service Engine Soon light just came on. Took out my OBD II scanner and the following codes came up: P1086, P1084, P0172, P0175.

I looked up P1086 and P1084 on this forum and found out that Fuel Control Mixture Lean (Bank 1 Sensor 1) and Fuel Control Mixture Lean (Bank 2 Sensor 1). I have no idea what this means. Can anyone help me with this? Is it the 02 sensors? If so where are they located.

For these codes P0172 and P0175, I found this thread: http://www.xoutpost.com/bmw-sav-foru...0175-dtcs.html
What should I be looking for when trying to fix this problem?

Thanks guys!