Proactive O2 sensor replacement?

[WannaCruise]

Hello all,

I'm slowly working through issues on my 1996 LX450 and I'm wondering if I should replace the O2 sensors. I don't have a CEL on, but the emissions status is showing yellow. The current O2 sensors are the original units and the car has 175k miles. The Denso units are only about $100 for the pair, but I don't want to throw money away needlessly. Any thoughts?

 

[FMC80]

Original? Hard to believe but if it ain’t broke...

 

[WannaCruise]

I should clarify and say the O2 sensors APPEAR to be original, though I suppose it is possible for them to have been replaced.

 

[secretasiansam]

Can't hurt anything. I had one bad, but replaced both.

 

[FMC80]

If you do it, it’s good practice to replace both at the same time.

 

[Rifleman]

Most car manufactures recommend replacement of O2 sensors as a regular scheduled maintenance item. They wear out with use like any out part. In the case of O2 sensors their signal to the CPU/ECM beings to to degrade with use and age. This change can definitely have an effect on how your truck runs, along with it's gas mileage.