HEy guys well my check engine light came of today so I took it to Auto zone and they did a check and the Code P0171 came up. I did some searching and got that it might be the O2 sensor and/or Vacuum leak. Also when I accelerate or keep a steady pace while driving I hear this loud rattle sound like something is lose. Just looking to find out if what I found is accurate and also if the rattle noise is associated with the Check engine light or O2 sensor issue and to see what something like this might cost. IF anyone has had the same issue before please let me know!! Oh and I have an 01' A4 1.8T.

Thanks!!!


Also My Air Bag light came on as well last week and is still illuminated so any help on making that go away is much appreciated!