Dummy O2 sensors - Hemi Truck Club
Go Back   Hemi Truck Club > HEMI | Performance Zone > Exhaust | Mufflers. Tips and Headers

Thread Tools Display Modes
Old 07-09-2013, 08:19 AM   #1
Junior Member
Join Date: Jul 2013
Location: San Antonio
Posts: 13
Dummy O2 sensors

Hi, I have a 2003 Ram 2500 4X4 and just got it inspected and want to replace the cat converter with a so called test pipe. First of all, do I need to replace the O2 sensor in front and the one behind the cat with dummy also called simulator sensors to trick the computer into thinking they are still working?

Where can I buy these dummy sensors at? Or can I just leave whats in there now and tell me how to bypass them somehow? What can happen?

When I purchased the i was given a receipt showing the cost of $1200.00 for the best flowmaster system they could put on this truck. It is just feeling a little lagging over the years and I heard to try and check to see if the cat is the problem. My truck is already loud is it is, how much louder and meaner will it sound if I do this?

capt.raymond is offline   Reply With Quote
Sponsored Links
Old 07-09-2013, 09:12 AM   #2
Senior Member
FAhemiST's Avatar
Join Date: Jul 2006
Location: Ulster County, New York
Posts: 3,150
you would add a sparkplug non-fouler to the rear sensor only, basically it pulls the sensor out of the exhaust stream a little bit. you can pick these up at any auto parts store.

pulling the cat out though will lower your low end torque, but it should feel stronger up top. might not be the solution to your laggy feeling.
05 Black RC 4x4-Gone but not forgotten
11 White CC 4x4
FAhemiST is offline   Reply With Quote
Old 07-09-2013, 05:05 PM   #3
Junior Member
Join Date: Jul 2013
Location: San Antonio
Posts: 13
If I replace the cat converter with just a pipe and not mess with sensors at all what will or can happen?
capt.raymond is offline   Reply With Quote
Sponsored Links
Old 07-09-2013, 05:29 PM   #4
ATXHEMI's Avatar
Join Date: Mar 2011
Location: Austin, Texas
Posts: 2,225
Only a check engine light.
BV Heads-Greene Racing Cammed & Tuned.

ATXHEMI is offline   Reply With Quote
Old 07-09-2013, 05:54 PM   #5
Redtruck-VA's Avatar
Join Date: Jan 2011
Location: Virginia
Posts: 19,272
Read about the sensors in the service manual and you will understand how they work. Using the non-fouler is IMO the best way to trick the PCM when doing this. Need two non-foulers, to stack together to isolate the rear sensor. Remove the rear O2s and screw a non-fouler into the bung. Take the second non-fouler and drill it out so the O2s can be screwed into it. Take the now modified non-fouler and screw it into the other non-fouler (stack). Then screw the O2s into the modified non-fouler and reconnect the wires. Or remove the rear O2s and wrap it with heavy tin foil leaving it electrically connected and safety wire it safely out of the way. This will some times throw a code for "slow to heat".
2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1956 Jeep Willys Pickup Hemi powered "Street Rod project"

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m


Support vehicle- 2007 QC G56 4x4 diesel
Redtruck-VA is offline   Reply With Quote
Old 07-10-2013, 05:43 AM   #6
Join Date: Oct 2009
Location: FL
Posts: 20,495
4.56 gears and a good posi would take care of that lag problem. One of the best mods to my truck.
Ghost03hemi is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Premium Vendor Showcase
n2 Speed Edge InTune Edge OCPerformance Parts

All times are GMT -6. The time now is 05:46 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.