kyk007

Good Saturday morning to everyone. In my ongoing replacement of parts on my car,
I have finally decided to swap out the oxygen sensors. In my reading on this forum and others, I see our cars have 4 oxygen sensors. Am I correct on this?

Also, since I am getting ready to order the OEM replacments online, I wanted to make sure. Are there 2 updraft and 2 downdraft, or what configuration are they? I would appreciate feedback from anyone who might know, or from someone who has replaced them on a 98-00 model.


Thanks in advance to all you LS experts out there in CL land.

Legender

I'd look here for parts.. yes 4 is correct two upstream left and right; two downstream left and right.

http://www.rockauto.com/catalog/more...id=437&jpid=18

http://www.rockauto.com/catalog/more...id=437&jpid=19

kyk007

Legender - you the man! I was thinking of ordering from RockAuto, so you read my mind. Thanks for the clarification. Much appreciated.

qewani1

before replacing them, check the readings on idle, the before CAT upstream ones should fluctuate between 0 - 9 v and the after CAT downstream ones should read zero.

O2 sensors are expensive don't change them unless if required, that is why i recommend testing them before replacing!

Yamae

Don't forget the decimal point, qewani1. 0 - 0.9V. The actual reading would be slightly higher than 0V to slightly lower than 0.9V though.

kyk007

Qewani & Yamae: thank you for your words of wisdom. I will go ahead and get the oxygen sensors tested just to make sure. Yamae, appreciate the clarification on the range of volt readings to look for.

dicer

Its real easy to check on an OBD2 car, with a scan tool/ code reader that reads real time info. And it would not make sense to change them if they are okay. If you can get a good deal on new ones and you plan on keeping the car like forever, then buy the new ones as spare parts you will need them at some point in the future.

kyk007

Dicer, you read my mind. I was wondering exactly how to check the oxygen sensors themselves, but you answered my question. I noticed you are in WA - if you don't mind me asking, whereabouts are you? I'm in Bellevue.

UNCNOR

iTrader: (1)

Take a look at the Denso O2 sensors from rockauto.com.

kyk007

UNCNOR - looks like we are on the same page. I was looking at the Denso too.