Could be anything at this point without getting some kind of fault code. Unfortunately this emmission warning could be a number of things so it could a be easy fix or a hard one. Once you get some codes, then repost here and maybe one of the members can give some insight. Search as well and you will see various topics on this emmission issue. Good Luck

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2008 650 Convertible- 6 Speed manual- Sport package- HUD- Lane Departure- Comfort Access- Merino Leather- HD Radio- SAT