98, lazy O2 sensor, replace all? 110k miles

[emarkay]

Is there a way to attach pictures, I've got screen captures from the scan tool??

I understand there's three Upstream, but my scanner only shows two. Anyways, one of the two that show is noticeably slow in decay time. Not throwing any codes and we sent them is an annoying idle flutter once in awhile and some offline stumbling. No other indications of any other problems. Being the responses are consistently a little different,figure I should just replace them.

Any suggestions?? I noticed there was a post from a while back but the images no longer show. Anybody have an update or specific tips on replacing the sensors?

I do have the shop manuals, but I know these cars have got a following of experts that might even know a way to do it simpler, cheaper, faster and better!

Many thanks to all!

[paulaurora]

There is option ADD Image to post.

[AuroraGirlFromMars]

why is there 3 pipes that merge into one? there is going to be a post o2 monitor.

post o2 is usually used to Help lifetime AFR trim changes i the sensors because its getting a decent accurate measure of how they are weariung.

[jimrockford007]

If you use a boxed in wrench make sure you use a 6 point and not a 12.