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Hello got a 2000 durango with a 4.7 in it i threw a check engine light 2 weeks ago saying system too lean , and bank 1 o2 signal delay.. the truck was throwin out tons of smoke under a heavy load and smelt like gas all the time i was getting about 3mpgs everywhere so i assumed that it was a o2 failure and changed the upstream sensor and everything went back to normal.. then about 3 days ago the light came on and i was getting the same codes and symptoms and instead of blowing anothr $80 i figured id look fo some help so if anyone know please help
when the light came on i pulled the clip off to make sure it was clean it did have an oil residue on it so i sprayed it with some elec cleaner and nothing changed do you think it shorted out?