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Oldsmobile Forum - Oldsmobile Enthusiasts Forums (https://oldsmobileforum.com/forum/)
-   Alero (https://oldsmobileforum.com/forum/alero-21/)
-   -   Catalytic Converter (https://oldsmobileforum.com/forum/alero-21/catalytic-converter-4291/)

Iflylow Mar 22, 2011 10:43 PM
Originally Posted by svnt442 (Post 10536)
That's odd. I was under the impression that all OBD II systems used O2 sensors for each bank of cylinders. I know there are 3 sensors on my 04 s10 and only 1 cat.
The wiring diagram for the 3.4 shows only 2, one downstream of where both banks join, the other after the cat. My 01 3.4 Alero had only 2, and my 00 3.8 Impala (also OBDII) has only 2 as well, in similar locations. I guess they can save $$ by not using more.

svnt442 Mar 22, 2011 11:44 PM
Hmm...Ok.

chunky Mar 23, 2011 01:08 AM
reply
 
Ok so I changed the cat, officially, and the car runs like new, thank god!
I did not change the 02 sensors.

Thanks 4 all ur replys.


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