Hi guys, I'm new to the forum and I just have a quick question. I'm trying to change out my O2 sensors I have a 1995 2.2 LX and there's two of them. One on the exhaust manifold and another under the car on the cat. However, when I go to Rockauto, there isn't a downstream sensor it just has bank 1 sensor 1 upstream and they either have male or female connectors. What O2 sensor replaced the one under the car? Thanks.

 

Four cylinder engine only has bank 1. Sensor 1 is up stream on the exhaust. Sensor 2 is down stream on the cat.
If RA doesn't have it then suggest looking elsewhere.