O2 sensors

[giovanni]

I searched, couldn't find much on this topic.

Is there any merit or reason to proactively replace the O2 sensors? If so, upstream, downstream, or both?

 

[r2m]

Never heard of anyone doing it or any reason to do it.
Q: What's your rational for wanting to?
But again, I'm still under 100k miles. If that matters.

 

[dwh13]

Nope. I haven't seen any issues on the 460s with them - early GX and LX 470s have the downstream ones go bad on occasion, but they're very cheap and simple to replace when that time comes (I did it on my LX a few years back).

 

[giovanni]

No reason other than I like to be proactive with maintenance. I know O2 sensors can drift over time and was just curious whether anyone thought of them as a maintenance item or not.

I'm at 60k miles, so certainly don't see it as a *need* but if it had some optimization effect on fuel efficiency I might do it.

 

[jmanscotch]

I've heard of people replacing them somewhere north of 100K as general maintenance versus a repair and reporting back a little better MPGs. I'd be surprised to find the MPG ROI is worth the cost of doing them early.