2002 Saturn LW200 Q&A
2002 Saturn LW200 Question: Do the O2 sensors have to be exact matches?
Saturn will of course say you must replace the sensor with one from them. The rear O2 sensor monitors catalytic converter efficiency and is slightly less critical than the front O2 sensor. Use a "brand name" "factory type electrical connector" and you should be OK. Carquest may have a Delphi sensor which are good, NGK, Denso also good makes. - patrick mannion
Purchase a Bosch Universal O2. It comes with detailed instructions on how to install it. The part # is 15733. It will cost about $75.00. - backyard tech