When to replace O2 sensor

[rajin cajun]

I recently completed severe service preventive maintenance on my Monty.

Should the O2 sensor be changed in preventive maint? My MPG have decreased, but i put larger tires on.

Of course, the owners manual states every 100,000 miles.

Thanks in advance..........

 

[bpfamily]

On my 1990 SWB the O2 sensor was throwing a code so I replaced it. It had no effect on the drive-ability of the rig.

Best,
Brad P.

 

[MonteroLTD]

If it ain't broke, don't try and fix it.

 

[jeep-N-montero]

Let me look into my crystal ball....says you are just fine either way.

 

[off-roader]

May be a good idea to replace if the threads aren't seized yet. This way you can ensure you use the appropriate anti-seize compound during the re-assembly process. At a minimum, I'd remove the old sensor and re-apply new anti-seize to it's threads then re-install it.