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

o2 sensor question.

  • Thread starter Thread starter DarkProphet
  • Start date Start date Jan 5, 2006

DarkProphet

Founding Member
Aug 19, 2002
391
0
0
Quakertown, PA
Jan 5, 2006
#1
  • Jan 5, 2006
  • #1
Hey guys, while ripping my car apart for the new engine, i noticed that only the one O2 sensor is plugged in (drivers side) and the other isnt there at all. The hole in the h pipe is plugged. Is this ok? or did the previous owner screw up?
 

94Blue302GT

Member
Oct 20, 2003
704
3
19
Chicago
Jan 5, 2006
#2
  • Jan 5, 2006
  • #2
DarkProphet said:
Hey guys, while ripping my car apart for the new engine, i noticed that only the one O2 sensor is plugged in (drivers side) and the other isnt there at all. The hole in the h pipe is plugged. Is this ok? or did the previous owner screw up?
Click to expand...
Uhhhh, yeah, unless you've got ONE HECK of a chip, it's prolly a screwup. What do you think? Missing sensor... whole plugged... Computer contolled...
Yeah, i'd say that's a problem. See if he tapped into that O2 for the sensor reading in the other side.
I would get that fixed.
 

VibrantRedGT

"STANGNET'S PENGUIN SMACKER"
15 Year Member
Nov 29, 1999
14,679
424
154
Boca Raton, Florida
Jan 5, 2006
#3
  • Jan 5, 2006
  • #3
If it's missing what is the passenger side O2 connector plugged into? Is the check engine light on?
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Jan 5, 2006
#4
  • Jan 5, 2006
  • #4
I dont know about the SN's (totally different bag) but foxes run in FMEM mode with no O2's at all, and they run decently with decent milage.

But with the SN processor being more advanced and so finicky, I bet it is chasing its tail with the lack of one sensor (I dont know what the default mode is on an SN, in other words). As Joe et al, indicated, getting a sensor installed would be good.

Good luck.
 

94Blue302GT

Member
Oct 20, 2003
704
3
19
Chicago
Jan 8, 2006
#5
  • Jan 8, 2006
  • #5
The Sn's DO have a "fail safe" mode in which case it will not use the O2's and will go only with the map stored in the computer and the MAF. I"m running this currently on my turbo. However, I also plan on getting a tweecer to delete them as well. It basically eliminates the ability for the car to "learn" or adapt to some of the changes from traveling, etc.
 

DarkProphet

Founding Member
Aug 19, 2002
391
0
0
Quakertown, PA
Jan 8, 2006
#6
  • Jan 8, 2006
  • #6
well I do get a check engine light, and this would explain why when I bought my car, there was an 02 sensor in the glove box... Ill try to hook it back up and see what happens.
 
You must log in or register to reply here.

Similar threads

M
Help! 2003 GT misfire when hot
  • Modular03
  • Feb 10, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
310
SN95 4.6L Mustang Tech Feb 13, 2026
Mustang5L5
J
O2 sens
  • JJ's90fox
  • Sep 11, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
5
Views
166
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Sep 12, 2025
Mustang5L5
G
2006 Mustang GT o2 Sensor Wiring Issue Car Bogging/Choking
  • GCantero93
  • Sep 5, 2025
  • 2005 - 2009 Specific Tech
Replies
4
Views
778
2005 - 2009 Specific Tech Sep 6, 2025
Noobz347
A
2020 Ford Mustang GT P0036, P0138, P0141 02 sensor help
  • AmkoA
  • Jul 29, 2025
  • 2015 - 2023 (S550) Mustang -General/Talk
Replies
1
Views
273
2015 - 2023 (S550) Mustang -General/Talk Aug 5, 2025
skkrtis
S
D
Engine HO cam in non HO roller block ‘93 f150
  • DanC1993f150
  • Mar 21, 2026
  • Fox 5.0 Mustang Tech
Replies
7
Views
209
Fox 5.0 Mustang Tech Mar 29, 2026
General karthief
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?