I've been experiencing the white-smoke-at-start-up and been running rich all summer now. So I decided to break down and try some new O2 sensors. $102.50 each!!!! Holy Boat Gas, Batman!!!! Is that right?
I paid 100 even for mine.so that is about the going price....but If you have a downpipe and no cat....you only have to replace the front one. No need to replace the 2nd one that is mid- car back...with no cat its useless. You didnt mention whether or not you have a cat or not so figure just in case could save a little money.