i have a 1995 z28 and i was having problems with my tranny, soo i put another rebuilt one in...but i had to take off my ehaust in the mean time, soo i got new sensors cuz the old ones were a lil to old and now im having a code come up saying its lean??? could it be i have a leak near the flange where the exhaust connects? any help will do thanks

 

If the O2 is working fine and noticing a lean condition then there is a good possiblity you have an exhaust leak in the manifold or header whatever you have. An exhaust leak after the O2 sensor will not show a lean code.