anybody know how much an o2 sensor costs? and is it easy to replace? have a 98 4runner 4 cylinder. could i buy the part and do it myself?

 

about 120 for dealer cost, 2 new nuts, and gasket

ez to replace

need a 12mm box wrench, or small vice grips
may need a small chisel to chip off the old nuts

then you need to scrape the old paper gasket off
so the bung is 100% smooth. again, chisel is great for this

new o2 sensor, new gasket, 2 new dealer stainless steel nuts

just climb under there and crank it off.
use eye protection a lot of crap will fall on you

 

Check out URDusa.com pretty sure they are cheaper than the dealer.

 

X2 on the eye goggles.

I've used www.1sttoyotaparts.com before and been pleased. They are the online department for a WA dealership. Usually have cheaper prices than your local dealer, and lower prices than your local dealer's online dept, too.

Did a quick check, looks like it'll be about $100, probably add $10 for shipping. Call the local dealership to get th correct part(s) number, then look around online, usually saves some $$$ if you can wait a few days.

 

URD all the way.

Fink

 

are those the ones you have to splice??

 

From the link:
These are direct replacement (not the universal cut & splice) sensors.

Read n00b!!!