2000 blazer 4.3L 4x4 . I see 3 o2 sensors . one of each pip coming down on the Y and one after the cat if I remember. there is no 4th correct? and they are all the same acdelco AFS105? or are 2 AFS105 and the third is something else? thanks

 

They were all the same on my 2002 Blazer...not an AFS105, but they were all the same. RockAuto shows only the AFS105 for a 2000 Blazer.

 

how are they not afs105 then you say they are? lol

 

they're all identical, just went through it on my 04

 

On my '02 the three O2 sensors are all the same, just not AFS105 O2 sensors....they are a different part number.

 

I couldn't tell you what part numbers are on my 04 :P but I do remember comparing the part numbers on the sensors themselves and they were all the same

 

there is probably the GM number on there which is the longer number

 

RockAuto lists the GM O2 sensors as 213802, not any AFS # by any of the suppliers. I just ordered these and installed them when I replaced the catalytic converters.

 

All three on my 2000 Blazer are AFS105. Installed them Oct 2011 and still running fine.

 

I was looking at Bosch numbers on mine I believe, but who's to say they were original.