samseed101

I bought two bosch Oxygen sensors about 11 months ago at Auto Zone near where I live. Sunday I removed my passenger side O2 sensor and replaced it with a Bosch Wideband O2 sensor. I then had to cut two of the wires on the NB sensor that i removed so that I could splice in a 20 ohm resistor to keep a Check Engine Light from coming on (from removing the Narrowband sensor.) That left me with a narrowband on my driver's side.

Well I fire up the car and immediately notice that the readings from my driver's side are off. Then tend to read about 1 point richer on the fuel trims. So I look at old logs and see that it has been that way for awhile now. Great, I have a bad sensor and I just cut up what would have been a good replacement. But luckily for me, I have a 12 month warranty on the sensors!

So that leads me to Auto Zone... I get there and tell the guy working the desk that I need to replace a sensor that failed but was under warranty ($65 each.) So he looks it up in the computer but it's not there. Of course, my first thought it WTF, I KNOW I bought them there and it should be in there. He finally finds a part number, but it doesn't match up.

So now I ask why it doesn't match up. It's teh same exact part. Well he looks deeper into it and notices that the O2 sensors I bought 11 months ago (the ones that are under warranty) are the sensors that go after the cats. But the one I had in my hand to buy was a pre-cat sensor. Therefore, I could not get the replacement because my post-cat O2 sensors that I bought for my 1995 GT 5.0 did not fail, it was my pre-cat sensor that failed. Anyone else see a problem with this?

After talking to the manager and trying to explain the situation, I got my replacement sensor for free. But wow, LoL.

mattdel

aparently they're not as smart as they're commercials make them out to be.
thats elementary level knowledge, if your gonna claim to know anything about cars.

my77stang

everyone fails, including ford for having the same plugs on both pre and post cat sensors

samseed101

They looked at me as if I had two heads when I told them that there was no way that it was possible. I even offered to bring them out and let them look for themselves, LoL. I'm not even sure why their computer would list it as an option!