Leave them alone.get a good scan tool and check the voltage.If its normal leave them alone.I replaced my stock,and put in a bosch.Now im having issues.One of my shops said that the aftermarket,meaning bosch has a tendency to cause problems.

 

Since we're on the 02 sensor subject...... any tips on getting the rusty bolts off, I'm junking a 95 and attempted to pull the sensor today, couldn't do it. PB blasted it and going to try again in a few days. Also whit size are the bolts? Sorry for the threadjack!!

 

I got a oxecetalyne torch,heated the nuts and hit them with a chisel.Came off no problem.Try the PB and a small pair of curved jaw vise grips.

 

Go with URD if you're going to replace it, great place to do business and you get more for your money.

You sound like me, replacing things before they are even causing issues. O2 sensors are the one thing that I will wait to go bad before replacing, only because there are so many variables.

OEM/URD/Denso are all the same thing - just different packaging.

DO NOT buy Bosch. Bosch is the manufacturer of the devil. Their spark plugs suck, their O2 sensors cause CEL's, even their wiper blades are junk. Sorry...I hate Bosch.

Sounds like you have two options, go ahead and replace them and have that peace of mind there or wait and be sure they even need it.

Let us know what you end up doing.

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EDIT: I just read the last few posts (I have a tendency to post before reading every last post ) - sounds like you made the right choice to not replace them.