Oxygen sensor question

n2o-89fox

New Member
Oct 8, 2007
116
0
0
ca
I was in the middle of replacing my o2's because they are the factory ones and I figured I should replace them. Anyways I was trying to remove them and couldnt so I broke one so I could get a socket on it and still was not able to remove it. Now with both of them unplugged and the one broken I drove the car to an exhaust shop to have them remove them and the car ran the same. No change at all in performance or idle. Shouldnt it have ran worse?? Or ran really rich?? Shouldnt the check engine light have came on? Granted I only drove it for about a mile but still shouldnt I have noticed a difference somewhere??:shrug: Oh and there is no custom tune or chip turning them off or anything.
Thanks for the replys
 
  • Sponsors(?)


HISSIN50

"How long does it take to get help in here?
SN Certified Technician
Nov 29, 1999
31,179
28
129
You were probably running FMEM and foxes run pretty decent like that.

As for the CEL, you might not have driven long enough. In my experience, it can take over 10 mins of driving for the CEL to come on. They take 30 seconds to 2 mins to light off and then there's a lag-time before the computer decides the signal is never going to stabilize.
 

NIKwoaC

中國製造
10 Year Member
Oct 31, 2006
5,523
921
214
Chengdu Province
If you only drove it for a mile, it probably stayed in open loop, and then it ignores the O2's anyway. O2's are just there to monitor AF ratio over time, and the computer slowly makes adjustments based on the signal output, so its not like your situation was going to cause a dramatic, instantaneous change in operation. Something that would cause havoc right away would be like a missing/damaged MAP sensor or TPS, etc, things that determine needed fuel supply (A/F ratio) directly.
 

HISSIN50

"How long does it take to get help in here?
SN Certified Technician
Nov 29, 1999
31,179
28
129
You don't have a MAP sensor. Mass air cars have a BAP. It would be your old MAP sensor without a vacuum line attached to it.
 

n2o-89fox

New Member
Oct 8, 2007
116
0
0
ca
its not there, I just noticed it should be a bap sensor but can anyone tell me where it supposed to be or a pic of where it is located? I have alot of unhook electric connectors on the passenger side and I think when the dumbass that took all the smog stuff off he took that off too. Would this cause a slight stumble once after starting the car and then it is fine after it does it once?
 

Black1987Stang

Active Member
Aug 22, 2004
1,422
0
37
33
Jersey Shore
While we're on the subject and you got your question answered, what happens when there's only one 02 sensor signal being sent to the computer? Does it stay in open loop or limp mode? Ive been running on one 02 sensor for a while now and I get alot of weird stuff going on tunewise,. Reason I'm only running on one 02 sensor is because I took it out to put in a wideband and the narrowband simulator isn't working.
 

Black1987Stang

Active Member
Aug 22, 2004
1,422
0
37
33
Jersey Shore
and to answer your question the map/bap sensor should be on the firewall in the center, right above the intake, it's black and plastic with I believe a 3 wire harness going into it and held in by 2 nuts.
 
Thread starter Similar threads Forum Replies Date
M Removing Oxygen Sensor Questions 1994 - 1995 Specific Tech 3
90silverstang Running Rich,A9M ECU and Oxygen Sensor question Fox 5.0 Mustang Tech 13
V oxygen sensors question on a 97 4.6L V8 SOHC -which one goes where? SN95 4.6L Mustang Tech 0
mustangphil Oxygen sensors, probably a dumb question Fox 5.0 Mustang Tech 2
K 04 Oxygen Sensor Question SVT Tech Forum 1
bock Bosch oxygen sensors question. Fox 5.0 Mustang Tech 4
D Oxygen sensor 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
D **HELP NEEDED** O2 PIGTAIL WIRES 1996 - 2004 SN95 Mustang -General/Talk- 2
D O2 sensor harness 1994 - 1995 Specific Tech 0
D Oxygen sensor help 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 6
Onesick99GT Exhaust Wideband Oxygen Sensors Help Needed SN95 4.6L Mustang Tech 8
K Help P1151 SN95 V6 Mustang Tech 1
fredfifty Exhaust Leak At O2 Bung Fox 5.0 Mustang Tech 33
A Plesae Help With Oxygen Sensor Sorting Out Fox 5.0 Mustang Tech 6
D Emissions Problem - Very High Hc Fox 5.0 Mustang Tech 35
T Please Help O2 Sensor Hookup 5.0 Swap 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
T Engine 2005 V6 Oxygen Sensor / Cel Problem 2005 - 2009 Specific Tech 0
Blown88GT For Sale 2 Bosch Oxygen Sensors, Nib Engine and Power Adder 3
des89stang SOLD 87-93 Denso Oxygen Sensors, Nib. Other Classifieds 4
Luis911 Electrical I Had Code 92, Exchanged Oxygen Sensors, Now Code 42 (update Now Code 44 And 94) Fox 5.0 Mustang Tech 7
Blown88GT SOLD 2 Bosch Oxygen Sensors, Nib Engine and Power Adder 11
L Changing Front Oxygen Sensors SN95 4.6L Mustang Tech 5
L Oxygen Sensor Clean Up SN95 4.6L Mustang Tech 0
Luis911 Engine Useful Life Of The Oxygen Sensor Fox 5.0 Mustang Tech 6
J 95 3.6L V6- Oxygen Sensor SN95 V6 Mustang Tech 3
8 oxygen sensor socket SN95 4.6L Mustang Tech 5
93lxtwin Oxygen sensors Fox 5.0 Mustang Tech 9
arnie93lx 87-93 M/T oxygen sensor harness Engine and Power Adder 1
R WILL 2001 gt oxygen sensors work in my 96 GT SN95 4.6L Mustang Tech 1
Tripoli Upstream Oxygen Sensors - On with open loop tune? SN95 4.6L Mustang Tech 8
I upstream vs downstream oxygen sensor 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
hollywoodstang oxygen sensors and off-road H pipe 1994 - 1995 Specific Tech 16
J oxygen sensors SN95 4.6L Mustang Tech 5
M 99 cobra oxygen sensor harness SVT Tech Forum 2
FoxRod87 oxygen sensors SN95 4.6L Mustang Tech 5
Hi-Po Oxygen sensors - Code 41 Fox 5.0 Mustang Tech 2
babybudistmonk Oxygen Sensors 2.3L (N/A & Turbo) Tech 3
M oxygen sensor wiring-92 2.3L (N/A & Turbo) Tech 2
tx65coupe 1997 Cobra Oxygen Sensors SVT Tech Forum 2
C Tell Me If I'm Crazy. Oxygen Sensors SN95 4.6L Mustang Tech 17
V oxygen sensors on a 97 4.6L V8 SOHC -which one goes where? 1996 - 2004 SN95 Mustang -General/Talk- 2
blackstangt 4th wire on oxygen sensor harness. Fox 5.0 Mustang Tech 2
G oxygen sensor??? Fox 5.0 Mustang Tech 6
Blk91stang Checking Power to Oxygen Sensors?? How?? Fox 5.0 Mustang Tech 2
Quick Pony Oxygen Sensor Removal?? Fox 5.0 Mustang Tech 10
Chowder Head Does anyone have experience with this oxygen sensor kit? Fox 5.0 Mustang Tech 3
Quick Pony Oxygen Sensors ? Fox 5.0 Mustang Tech 3
chr1s11575stang Oxygen Sensors??? Fox 5.0 Mustang Tech 9
I Installed BBK longtube headers and engine runs better without oxygen sensors!!! Fox 5.0 Mustang Tech 8
Dean85GT Oxygen sensor bung thread size? Fox 5.0 Mustang Tech 2
Similar threads