I just recently bought a 2000 dodge Durango Sport 4.7 for 1200. Yesterday my check engine light was off until I left for work around 7:30pm. As I was at work I sat in my car and smelt gas as it idled but the motor runs smooth. I think it's my 02 sensor but I'm not sure? Anyone have any ideas?

 

Check codes, see what its whining about.