Estimated cost for parts and labor for an O2 sensor on 2001 Toyota RAV4

I have a 2001 Toyota Rav 4 that needs an O2 sensor. It is an all whell drive and I understand there are four different kinds. How much should this repair cost me in parts and labor? Thank you. John

Asked by for the 2001 Toyota RAV4
Each of the sensors is about .8 to 1.0 hour to replace (if not striped or seized) OE fit or direct fit sensors (not universal fit type) are the only sensor to use they will run $130 to $155 each, maybe 20 minutes to test each or reset the computer. On these if the heater circuit malfunction code is set it is 99% of the time a bad sensor no testing needed.
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...and if you have over 100K you should consider replacing all four. $750 range but it's worth it. Milt's is right in Vallejo just down the road. Call Adrian at (707)643-7548