John/Horace Posted April 21, 2021 Report Share Posted April 21, 2021 Interesting discussion. I changed my upstream O2 when I was on top of them doing other repairs. At 140-180k kms range without any codes having turned up. Expensive gas country affects the logic for this decision. Didn’t really notice appreciable mpg change.? https://bobistheoilguy.com/forums/threads/scheduled-replacement-of-o2-sensors.313428/ Quote Link to comment Share on other sites More sharing options...
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