Front O2 sensor original, does not test bad.
Rear O2 sensor tests bad.
If I replace the rear sensor with one from Carquest will it affect engine performance?
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2002 Saturn LW200 Question: Do the O2 sensors have to be exact matches?
Answer #1patrick mannion from Greg Solow's Engine Room, August 31, 2009, 19:46Master
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.
Answer #2backyard tech August 31, 2009, 22:36Master
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.