installing down stream o2 sensor

[pothound]

hi
i need help installing downstream sensor on 98 lesabre. i would like to know where it is located,and best way to disconnect the cable and remove sensor.
thank you
pothound

[Smith1000]

It is on the exhaust close to the firewall. I have read they are easier to remove if warmed up. I have 2 97 Lesabres and have done this a couple of times. The O2 sensor is easier to get to in order to remove it if that crossbar is unbolted and moved out of the way. I believe, Lesabres only have one O2 sensor, before the cat converter.

[BNaylor]

Originally Posted by Smith1000

I believe, Lesabres only have one O2 sensor, before the cat converter.

Are you sure? There should be a post CAT converter 02 sensor which monitors CAT converter efficiency. AC Delco PN: AFS123.

[Smith1000]

I have heard that before, but have never found a downstream sensor on my 97 Lesabre. Maybe the later years had a downstream sensor?

[BNaylor]

Originally Posted by Smith1000

I have heard that before, but have never found a downstream sensor on my 97 Lesabre. Maybe the later years had a downstream sensor?

On the '97 model LeSabre that is quite possible. It depends on whether it was delivered with or without the RPO code WA2 changes. I recall we discussed this issue in the past concerning '97 LeSabres. For '98 and up no doubt in my mind there is a post CAT 02 sensor since I have seen it.