Rick Pardo

do you change the other 3 also?

I just passed 96.5k, is it inevitable that the other 3 crap out soon after? I know "useful life" is around 100k - so does this become a pay me now or pay me later situation?

Flint'sA6

I've read you're supposed to replace them in pairs (front pair or rear pair)

BernieBenz

Reset the fault code several times, see if it continues to come back.

Boston Driver

...but if ain't broke, why fix it? Replace the broken ones.

4Driver4

Never. I changed one 75k ago; the rest are original.

KillA6

throwing codes. Both of them. The pass side threw the code more often. And it worked out b/c it was the easier one to get to. I changed out only the one and I am going to change the other one this weekend.

I only changed the one about a week ago but i don't get any O2's codes anymore.

But like its been stated its def better to do in pairs. I think all 4 might be over-kill unless you just want to do it now while your in there.

SloopJohnB@mac.com

MD checks the codes every two years and I service it when/if the CEL comes on.

Wifey is NOT going to be happy when they go...

a62.7t4ceo

Replacing in pairs is basically a "While you're in there you might as well so you don't have to go back in there when the other breaks."

A8CT

I wouldn't worry about the post cat, they have no affect on driveability.

SloopJohnB@mac.com

but a code will fail emissions inspection...