ok i know where 3 of my o2 sensors are and ive changed them all but i still keep gettin that damn ses light keeps comin on so its gotta be the sensor i cant find its the p0133 code plus the p1133 code comes on an it says its an ho2 sensor and i cant find a map that tells me where they are hidin at. does anyone know can ya help me. thank you
oh yeah its a 96 s10 blazer 4x4 4.3 v6 with the 'w' type motor

 

there is one on each side of the y pipe before it connects, one after the y, and one about 4 ft after the cat.

 

There are only 3 - take a look at the attached picture:


[IMG]local://upfiles/667/4A46C29AFCF949F682A2966A96B081F6.gif[/IMG]

 

And your positive its not your EGR????

 

thats funny... i have only found one(1) o2 sensor on my truck...

and i have replaced it... is there more than one on a 94 blazer?

 

Some trucks only have one. My '87 only has one.

 

sorry should have mentioned that was for my old 97 Blazer.