Which Sensor

ok... So I am going to replace my sensor 2 behind cat convertor to see if that is the problem with my check engine light

So I went to parts train to find one.... they have like 4... with 1,2,3, and 4 wires ..... I have a 96 camry 4dr 2.0 (or 2.2 can't remember) liter engine...

I've looked all over toyota sites for a part number but couldn't find anything

Please help

Bring or call in your VIN to a Toyota parts department for the correct part number.