For sale is a Denso Oxygen sensor, I ordered it under the assumption that my 4Runner had federal emissions, turns out it's Cali. Anyway... I unwrapped it, put it in, then the harness didn't match up, so back in the box it went. Needless to say it's still brand new, just in an open package.
Part No. 234-4162
This is the proper O2 sensor for both front and rear for a '00 V6 Auto for the front or rear sensor. This is for
Federal emissions, not Cali.
It is also the proper sensor for other years/engines/trannies. Check
this link for compatibility, this is where I bought it.
$80 Shipped anywhere in the US.