• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

O2 Sensor help, please

  • Thread starter Thread starter Chaos A.D.
  • Start date Start date May 2, 2005
C

Chaos A.D.

New Member
Dec 30, 2003
46
0
0
Webster, MA
May 2, 2005
#1
  • May 2, 2005
  • #1
Ok. so i bought some MIL Eliminators off of a guy on stangnet and popped them into the rear O2 sensors, but I am still pulling two O2 sensor error codes, causing my car to run lean. i don't want to think i was sold faulty O2 sensors, so i have a couple of questions, if anyone can help.

1. I had to extend the O2 sensors for the O/R X about 20 inches, which i did by using butt-connects and then running electrical tape over the whole thing to keep the connections in place. If one or two of those wires were crossed or loose, would that cause an error code with the MILs in place or should the MILs work no matter what?

2. There is a slight chance i still have an exhaust leak from when the X-pipe was put on. Could an exhaust leak cause two O2 sensor error codes to pop up in the EEC or would an exhaust leak have a different kind of code all its own?

I will eventually swap to long-tubes and a catted, shorty-H, so i am skeptical about buying a brand new pair of Eliminators just to see if they will work. if anyone has any input, i'd appreciate some help. until i can get the funds for the LTs and H pipe, i'd like to have my car running normal and not lean. btw.....anyone know how much power loss that is?

thanks,

joe

 
I

izoz351

New Member
Apr 2, 2005
15
0
0
May 2, 2005
#2
  • May 2, 2005
  • #2
SES light

P0133 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 1.
P0153 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 2.
Go to autozone and have them run the codes for you. If these are the ones you are getting then it may also be the MAF. I had the same problem with my 03 GT after I got the MAC longtubes and dr. Gas xpipe and also had the TB/Upper plenum, and CAI.
If not, one if these could be your problem:
P0171 System Too Lean - Bank No. 1.
P0172 System Too Rich - Bank No. 1.
P0174 System Too Lean - Bank No. 2.
P0175 System Too Rich - Bank No. 2.
 

csledd

Official Ovary Punching Member
Founding Member
Aug 18, 2001
1,115
1
0
Paducah, KY
May 2, 2005
#3
  • May 2, 2005
  • #3
I'm throwing a code right now after I put my LTs and O/R X-pipe on.. but I'm gonna try the SLP o2 simulators. You could just buy something like a Diablo Predator and turn them off
 

COramprat

...I can take it. I think.
20+ Year Stangneter
Mar 2, 2003
8,474
1,463
223
Sea of Tranquility
May 2, 2005
#4
  • May 2, 2005
  • #4
Did you reset the computer by having the codes erased or diconnecting the battery for about 15 minutes?

An exhaust leak would throw a code but it would be a strange coinsidence that you would have a leak on both side. Usually people have trouble with the passenger side since that is the one hardest to get too. Try tightening the bolts again

Crossing the wires would give you an circuit error (I think). It wouldn't be the normal codes your would get fron not having cats. Just trace the wires to make sure they connected to each side as they would be if you didn't use the extra wire at all.
 

sgarlic

Founding Member
Apr 21, 2001
3,085
1
56
May 2, 2005
#5
  • May 2, 2005
  • #5
What codes are you getting? Unless you messed with both front o2 sensors, it's not causing you to run lean. The rear sensors only monitor the efficiency of the catalytic converters. The front sensors are what cause you to run lean or rich.

If you can tell us the codes, we can narrow it down. If you know the codes, Bank 1 is passenger side, Bank 2 is driver side.

Personally, when I had the front driver side wires crossed from extending them, I got P0059.
 
C

Chaos A.D.

New Member
Dec 30, 2003
46
0
0
Webster, MA
May 2, 2005
#6
  • May 2, 2005
  • #6
honestly, i forget what the codes are. i had it plugged in just out of curiosity while i was getting my inspection sticker the other day. there were two codes, that i know, both for the O2 sensors. one of them had an error code for the O2 and said "STUCK LEAN." i'll have to see if i can hit auto zone so i can get the exact codes for you guys. i appreciate the help. i'll swing over there tomorrow and post again tomorrow night when i get into work.

thanks again,

joe
 
C

Chaos A.D.

New Member
Dec 30, 2003
46
0
0
Webster, MA
May 2, 2005
#7
  • May 2, 2005
  • #7
BTW. i originally disconnected both terminals on the battery for a minute or two, but i also had the guy that gave me the inspection sticker clear them off with his machine. is one way better than the other?

thanks,

joe
 
C

Chaos A.D.

New Member
Dec 30, 2003
46
0
0
Webster, MA
May 3, 2005
#8
  • May 3, 2005
  • #8
okay, i'm back. i went to AutoZone today. the error codes on the guy's machine were P0060 and P2273, neither of which are on the sticky thread to help me understand what they mean. can anyone help?



thanks,

joe
 
C

Chaos A.D.

New Member
Dec 30, 2003
46
0
0
Webster, MA
May 5, 2005
#9
  • May 5, 2005
  • #9
can anyone help me with this? i have a friend going to the Ford dealership for his Cobra today, but i don't think Ford is going to give me the answers i am looking for. please?
 

Mike97gt

it doe snot
Founding Member
Jan 26, 1999
10,633
7
89
the people's republic of massachusetts
May 5, 2005
#10
  • May 5, 2005
  • #10
Chaos A.D. said:
Ok. so i bought some MIL Eliminators off of a guy on stangnet and popped them into the rear O2 sensors, but I am still pulling two O2 sensor error codes, causing my car to run lean. i don't want to think i was sold faulty O2 sensors, so i have a couple of questions, if anyone can help.

1. I had to extend the O2 sensors for the O/R X about 20 inches, which i did by using butt-connects and then running electrical tape over the whole thing to keep the connections in place. If one or two of those wires were crossed or loose, would that cause an error code with the MILs in place or should the MILs work no matter what?

2. There is a slight chance i still have an exhaust leak from when the X-pipe was put on. Could an exhaust leak cause two O2 sensor error codes to pop up in the EEC or would an exhaust leak have a different kind of code all its own?

I will eventually swap to long-tubes and a catted, shorty-H, so i am skeptical about buying a brand new pair of Eliminators just to see if they will work. if anyone has any input, i'd appreciate some help. until i can get the funds for the LTs and H pipe, i'd like to have my car running normal and not lean. btw.....anyone know how much power loss that is?

thanks,

joe

Click to expand...

BTW the rear 02 monitors ( thats what those are behind the cat) are not used by the computer for fuel mixture purposes. if your car is leaning out, this is not the reason why. the rear 02 sensors ( they are called monitors, if downstream) are only used too let the PCM know if the cat converters are not cleaing the exhaust gases properly. they have zero effect on air fuel ratio.

even the upstream switching 02's have very very very little effect on WOT operation. the PCM ignores any 02 readings at WOT, due too the narrow band 02 sensors inability too read a accurate reading when not at stochiometric.
 
E

Erskine

New Member
Sep 11, 2004
109
0
0
Detriot
May 5, 2005
#11
  • May 5, 2005
  • #11
they might be wired up wrong cause thats how mine were.
 
C

Chaos A.D.

New Member
Dec 30, 2003
46
0
0
Webster, MA
May 5, 2005
#12
  • May 5, 2005
  • #12
thanks for the info about the O2s. i saw someone else's post about a P0059 because his front O2s were crossed, so that might be why i am getting the P0060, for my rear ones, but now i need to know why i am getting the P2273, which i know said either "stuck lean" or "stuck rich." if i had a leak on the passenger side from the gasket moving during install, could that cause a problem with the front O2? i hate not knowing my stuff, but i that's how we learn, i suppose. maybe i'll be the one giving advice someday.

thanks again.....one step closer to an answer

-joe
 

sgarlic

Founding Member
Apr 21, 2001
3,085
1
56
May 5, 2005
#13
  • May 5, 2005
  • #13
Yea I was the guy with the P0059 code. Both your codes are for the rear drivers side o2 sensor. You've got crossed wires, or your mil elims are spliced in wrong.
 
C

Chaos A.D.

New Member
Dec 30, 2003
46
0
0
Webster, MA
May 5, 2005
#14
  • May 5, 2005
  • #14
thanks sgarlic. i appreciate the help. i will unplug the O2 when i get out of work and get to checking it right away. thanks again to everyone that replied!!

joe
 
You must log in or register to reply here.

Similar threads

C
Need MIL Eliminators?
  • crazyone64
  • May 18, 2026
  • SN95 4.6L Mustang Tech
Replies
3
Views
74
SN95 4.6L Mustang Tech May 21, 2026
GOvert
G
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
0
Engine Multiple o2 sensor codes, car runs terrible
  • 02newedge
  • Jun 12, 2025
  • SN95 4.6L Mustang Tech
Replies
5
Views
457
SN95 4.6L Mustang Tech Jul 19, 2025
squeak93
W
Helpful information for O2 sensors and Longtube headers
  • Warhorse85
  • Aug 16, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
181
1996 - 2004 SN95 Mustang -General/Talk- Aug 16, 2025
Warhorse85
W
Tuners come on inside
  • squeak93
  • Feb 13, 2026
  • SVT Tech Forum
Replies
1
Views
213
SVT Tech Forum Feb 20, 2026
squeak93
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang 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?