Oldsmobile/Buick Repair: oxygen sensor, oxygen sensor, check engine light

Question
I have a 1984 olds.delta88 with a 307 engine.my check engine light comes on after my car has been on for 2min. used a code reader and got code#45 which is rich oxygen sensor i replaced it and it still dose the same thing. and when light do come on i have black exhaust, i have a new carb,oxygen sensor what do i do

Answer
Hi Ike,
If you are getting too much gas dumped into the engine, the sensor should read rich...and it is working correctly.
The sensor isn't the problem, it is the rich condition that is the problem.

I suspect a choke out of adjustment, that is just not opening up.

Van