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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

Upstream and Downstream Oxygen sensors

  • Thread starter Thread starter red ink
  • Start date Start date Feb 17, 2006

red ink

Founding Member
Apr 8, 2002
746
1
0
Arizona
Feb 17, 2006
#1
  • Feb 17, 2006
  • #1
What is the difference? Im trying to buy some on the internet and there are two different types for 5.0L mustangs
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Feb 17, 2006
#2
  • Feb 17, 2006
  • #2
We have only 2 O2's total. OBD-II V8's (read 96+ GT's) have 4.

I suppose ours would be considered upstream (downstream would be toward the mufflers IMHO, and those would be the OBD-II specific lambdas for monitoring the catalyzation process).
 

red ink

Founding Member
Apr 8, 2002
746
1
0
Arizona
Feb 17, 2006
#3
  • Feb 17, 2006
  • #3
thank u sir :SNSign:
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Feb 17, 2006
#4
  • Feb 17, 2006
  • #4
I would confirm that you are looking at the correct ones before ordering (or before they ship atleast) since my logic might be totally flawed.

I do know what you are talking about though (I have looked them up and seen the same thing).

FWIW, quite a few guys on here order them online and they have posted the correct part numbers if you feel like searching old threads.

BTW, I am not sir.
 

Slow5.0

Active Member
Feb 13, 2003
2,554
0
46
Portland, OR
Feb 17, 2006
#5
  • Feb 17, 2006
  • #5
94-95 have only 2 O2s
Ours are upstream because its before cats
4.6 (96up) use 4 O2s two upstream before cats and two downstream after cats
 
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