more oxygen sensor help

**2002** · 07-24-2010, 01:10 PM

..........got my new denso oxygen sensor......dunno what happened, but the wires are about 6 to 8 inches short......im guessing i can cut the wires from my old one and butt connect them onto the new one ?......correct me if im wrong.... thanx

**98maro** · 07-24-2010, 01:25 PM

I was told that you cBt cut the cable on the oxygen sensors
Bad idea. Buy some extensions

**0rion** · 07-24-2010, 01:39 PM

do you have headers and what is the part number of the denso's?

**2002** · 07-24-2010, 01:51 PM

i do NOT have headers....and the part # is 234-4087.......it said pre- cat right

**0rion** · 07-24-2010, 02:04 PM

how long is the harness on that? Going by memory but the stock harness itself is only about 6-8" long.....been a while since I've messed with stock sensors but that's going by memory. When you compare it to the front sensor harness it comes up that much short? Like I say, been a while since I've seen stock sensors.

**2002** · 07-24-2010, 02:09 PM

im gonna say the stock sensor is about a foot long ( the wire part) and the new sensor is approx. 4 inches too short.......could i have gotten the wrong sensor I.E. the passenger side instead of the drivers side?

**0rion** · 07-25-2010, 01:51 AM

denso lists that as the pre-cat right which would be the passenger side. Whatever you do try not to splice wires.....people have created some real headaches for themselves doing that. You can either send it back for the correct sensor or buy a premade extension.

**2002** · 07-25-2010, 06:09 AM

ok , thanks Orion....ill just buy the pre cat left....and change them both out.

**ws66sw** · 08-21-2016, 06:17 PM

old thread, but may be useful

2000 ws6 formula failed smog, codes indicated that the 02 sensors were bad. I went with denso

part # 234-4025 there are 3 of these
" 234-4087 " " 1

4087......12.2" wires
4025......16.54" "

went all thru the internet, conflicting info on whether upstream, downstream, right, left, etc.

common sense says that if they are the same part numbers, what difference does it make

4025... location exhaust pipes
4087... after catalytic converter

conflicting info... 4025 says upstream pre-cat left on some sites, downstream on others
" " 4087 says upstream, pre-cat right on some sites, upstream on others

my point is what difference does it make if 3 of them have the same part number and same length, while the other one has a longer length. just take them out and compare them, put the longer one where the longer one is on the car, put the other three where they are on the car.