where to replace o2 sensor and how much?

[ashvalley]

rt

 

[stevenw]

不同车图纸不同。好坏O2造成的汽油利用率差不到1%。
如能通过尾气检查，好像没必要换。

 

[玉簟秋]

I just had O2 sensor replaced and cost is around 430 dollars if not covered by warranty. Luckily I have the extended warranty so the cost is 0.