I just went recently to get my engine check up at autozone and two codes came up which of course I didnt think to save them on my phpne but the worker said one came up as a bank 1 02 sensor and the other a maf or possible vacum leak wich he believes may be the reason that triggets the 02 sensor..so where is the best place to look at where the most issues of vacum leaks accur?

 

They usually print those out for you..

Check all the rubber hoses in the engine bay. Also check the MAF sensor in the intake and make sure the pieces of the intake are all secured together.

You might just need a new o2, depending on what the code was.