4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

2002 Mustang GT Emissions Fail! HELP!

Old 05-17-2019, 05:34 PM
4th Gear Member
Thread Starter
Join Date: May 2003
Location: Chi-town!!!
Posts: 1,205
Exclamation 2002 Mustang GT Emissions Fail! HELP!

Hi everyone. I am looking for advise on how to pass emissions in Chicago, IL with my '02 GT. It was modified and tuned by Sutton HP which is no longer in business. I have Bassani mid-length headers, a Bassani X-pipe w/no cats, and a Magnaflow cat-back. The passed emissions successfully for years post modifications, but apparently the state of IL has made the testing more strict and now no matter what I do it won't pass. What can I do in order to pass emissions with my car? Please help....
GSXRIntensity is offline  
Old 05-19-2019, 11:41 AM
ROTM Moderator
1slow67's Avatar
Join Date: May 2007
Location: Huntsville, AL
Posts: 8,006

Ether pay off a shop to give you a sticker, look into getting stock parts to put on the car for inspection purposes, or move to a state that doesn't require emissions testing.
1slow67 is offline  
Old 05-19-2019, 11:45 AM
is my username.
99GTvert's Avatar
Join Date: May 2006
Location: Earth
Posts: 13,774

Did they explain why it failed?
99GTvert is offline  
Old 05-19-2019, 02:34 PM
5th Gear Member
Join Date: Jan 2018
Location: Pennsylvania
Posts: 2,325

Change the oil, idle it, change the oil again, get it tested immediately. There is also an
additive you can buy a Walmart that says it guarantees to pass emissions, or your
money back.

Cars can fail if there is gas-saturated oil in the pan. I always take mine in after a
fresh oil change.

There are other products:
08'MustangDude is offline  
Old 05-20-2019, 01:47 PM
6th Gear Member
Join Date: Feb 2005
Location: AZ
Posts: 11,693

It all depends why it failed. What is new about the inspection process? They dyno it, they plug in an OBDII scanner? What?

Dyno with a sniffer could be like MustangDude described, OBDII scanner could be sensor related (O2 sensors turned off or unplugged...etc.
Derf00 is offline  
Related Topics
Thread Starter
Last Post
Tuner Central
03-24-2011 10:58 AM
Classic Mustangs (Tech)
03-23-2009 07:31 PM
4.6L V8 Technical Discussions
11-18-2007 06:15 PM
4.6L General Discussion
08-30-2007 01:16 PM
V6 (1994-2004) Mustangs
09-23-2005 12:53 PM

Thread Tools
Search this Thread
Quick Reply: 2002 Mustang GT Emissions Fail! HELP!

Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.