'93 245 w/ 215k miles.

Picked up the Check Engine Light (CEL)w/ 2-3-1 (Fuel system compensating for rich or lean air/fuel mixture at cruise) and 2-2-1 (Fuel system compensating for extremely rich or extremely lean air/fuel mixture at cruise). Replaced the O2 sensor (Bosch) and oil cap gasket. Reset CEL. CEL still comes back on w/ same codes. This morning, I found a little vacuum line that runs from the air intake (at the engine)to down under the air filter box was completely severed. Does this little vacuum line have anything to do with the ventilation dampers in the car? Just to be clear, there are like TWO vacuum lines at the air intake where it clamps to the engine, ..well the one that I found severed is very small diameter and is routed underneath the air filter box at the front of the car. (not sure where it goes).

Anyway...I plugged the tiny line (where it was severed) and reset the CEL. CEL still came back on again with the same two codes. What all could be making these two codes come up? The O2 sensor that I bought had three wires (two white and one black). Does it matter which white wire I connect up? I couldn't find anything marked on the two white wires under the car. Did I mess up the O2 sensor installation? Need some ideas here.

Cabbie