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

03 GT Emission Test Problems...

  • Thread starter Thread starter mygt2fast4u
  • Start date Start date May 14, 2009
M

mygt2fast4u

New Member
May 14, 2009
5
0
1
Orlando, FL
May 14, 2009
#1
  • May 14, 2009
  • #1
I have a 03 GT, and well my check light was on... It is that time of year to get my Tags renewed, so I went to Autozone and had them run a scan. It said bank 2 sensor 1 was slow response. So I replaced it and I replaced the other side as well. Well after going through the "drive cycle", the light came on again. I took it to Delk and they looked at it and plugged in their Predator Tuner to read the codes. Well the Predator read that there was NO codes, that everything was fine...Even thought the check engine light was ON!! I am still confused at this. So Delk cleared the codes for me, and I was on my way to go through the drive cycle yet again...

Well after awhile wouldnt you know, the check engine light came on again. And again it said bank 2 sensor 1 slow response. Has anyone else had this problem? I have longtube headers and hi-flow cats and Delk put in o2 wire extensions in. Is the extensions giving me the slow response?

I almost bought a tuner, but I was told by Delk that I could use it and disable the sensors, but I would still fail emissions because they would be able to tell that I turned them off and the car would fail..
 
R

rpburnette

Member
May 22, 2003
152
0
16
Tampa, FL
May 14, 2009
#2
  • May 14, 2009
  • #2
Your rear O2 sensors might not be close enough (might be too cool) to your engine and causing the slow response. You could try moving them closer to the engine.

I have Bassani x-pipes with cats and I have and SCT xcalibrater tuner and I had my O2 sensors after the cats turned off and I had my car inspected 3 times like that in NC and no problems. If no one responds from this board, and you can't find an answer than just have the rear O2's turned off and try and get your car inspected.

Good luck
 

streethorse

15 Year Member
Oct 8, 2005
1,042
6
58
Dallas Texas
May 14, 2009
#3
  • May 14, 2009
  • #3
Same thing happened to me after I installed my Bassani. I replaced both
o2 sensors. All was good for about 2 months, then the light would come
for 2 or 3 days then go away by itself for days or weeks then come back.
After a month or 2 it went away and has never come back on.
 
M

mygt2fast4u

New Member
May 14, 2009
5
0
1
Orlando, FL
May 15, 2009
#4
  • May 15, 2009
  • #4
Has anyone else ever had a P1053 code pop up???
 

streethorse

15 Year Member
Oct 8, 2005
1,042
6
58
Dallas Texas
May 15, 2009
#5
  • May 15, 2009
  • #5
If your car is running fine I would just clear the code then imeadiatly get
your inspection same day before it comes back .
 
M

mygt2fast4u

New Member
May 14, 2009
5
0
1
Orlando, FL
May 15, 2009
#6
  • May 15, 2009
  • #6
streethorse said:
If your car is running fine I would just clear the code then imeadiatly get
your inspection same day before it comes back .
Click to expand...


I tried that, failed because OBD was not ready... It didnt go all they way throught the drive cycle. And when I do get through the drive cycle, the code pops back up...

Frustrating...
 
B

blubullett

Member
Jun 22, 2006
535
6
18
Modesto, CA
May 16, 2009
#7
  • May 16, 2009
  • #7
Swap back to stock headers and H pipe for the test then swap your long tubes back on..... sounds ****ty but thats what we have to do in california.
 

SaleenGT2001

Well-Known Member
Jul 18, 2005
2,811
4
58
Four Oaks NC
May 16, 2009
#8
  • May 16, 2009
  • #8
just set the rear O2 sensors to "do not report" in the tune
 
R

Red04GT

New Member
Nov 5, 2007
10
0
0
Gardner, KS
May 17, 2009
#9
  • May 17, 2009
  • #9
Mode 6 data would help you figure out this issue. but you would need access to a scanner for this.
 
You must log in or register to reply here.

Similar threads

Engine Random Misfire at idle.
  • Gulftown980x
  • Jul 29, 2026
  • SN95 4.6L Mustang Tech
Replies
11
Views
391
SN95 4.6L Mustang Tech Jul 31, 2026
squeak93
A
P0036 P0056 P0137 P0157 2020 Ford Mustang GT
  • AmkoA
  • Jun 16, 2026
  • 2024+ (S650) Mustang -General/Talk
Replies
0
Views
202
2024+ (S650) Mustang -General/Talk Jun 16, 2026
AmkoA
A
Tuners come on inside
  • squeak93
  • Feb 13, 2026
  • SVT Tech Forum
Replies
1
Views
308
SVT Tech Forum Feb 20, 2026
squeak93
F
Trouble Shooting Sudden Shift of AFR at low RPM
  • Farva_84
  • Jun 6, 2025
  • SN95 4.6L Mustang Tech
Replies
8
Views
545
SN95 4.6L Mustang Tech Jun 8, 2025
Farva_84
F
E
2007 GT Stalls when lights or a/c turned on
  • ejscarfo
  • Jun 22, 2026
  • 2005 - 2009 Specific Tech
Replies
2
Views
206
2005 - 2009 Specific Tech Jun 29, 2026
ejscarfo
E
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?