Second oxygen sensor - The Saab Link Forums

Go Back   The Saab Link Forums > Saab NG900 '94-'98 and 9-3 '99-'02 Forum > Performance Modifications for the NG900 / Old 9-3

Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

SaabLink.net is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 08-22-2012, 07:01 PM   #1
TSLMember
 
Join Date: May 2012
Location: Los Angeles, CA
Posts: 49
Second oxygen sensor

What does the second oxygen sensor do?

My downstream sensor is not connected, cable was to short.
Before I installed a JZW tune, this would result in a CEL code.
Now, after JZW tune no CEL code anymore.

Great! But, is it safe to run the car without out it, what does the second sensor provide or check for the ECU?

Possibly, you guys have a thread already, to cover this?
Mato is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-22-2012, 07:17 PM   #2
WSW
Elder
 
WSW's Avatar
 
Join Date: Oct 2010
Location: ChiTown
Posts: 4,788
Pretty much tells the PCM whether the catalytic converter is working as it should.. No harm will be done without it, many people disable the second o2 when tuning
__________________
99 Viggen
04 9-5 Aero Wagon
WSW is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-22-2012, 08:39 PM   #3
TSLMember
 
Join Date: May 2012
Location: Los Angeles, CA
Posts: 49
Ok, sounds good, thanks.
I guess when you completely unplug the second sensor,
It will not result in a CEL, I still have a cat and passed smog check, as well.
Mato is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
 
Old 08-22-2012, 10:14 PM   #4
Elder
 
comtrang's Avatar
 
Join Date: Aug 2007
Location: Salt Lake City, UT/Kansas City, MO
Posts: 2,347
Send a message via MSN to comtrang
I'm.not sure if its necessarily that it won' t throw a cel when disconnected but it can be turned off in the software which might not cause a code. Never tried it though.
__________________
Daily Driven '00 Saab 9-3
Bone stock
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

SOLD '97 Saab 900SE
Stock 2.0
Holset HX35


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

-Branden
comtrang is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-23-2012, 09:35 PM   #5
TSLMember
 
Join Date: May 2012
Location: Los Angeles, CA
Posts: 49
Quote:
Originally Posted by comtrang View Post
I'm.not sure if its necessarily that it won' t throw a cel when disconnected but it can be turned off in the software which might not cause a code. Never tried it though.
I think John Williams turned it off in his ECU that is in the car now.
Mato is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-23-2012, 11:17 PM   #6
Flirting With TSL Addiction
 
PimpMyPc's Avatar
 
Join Date: Jul 2010
Location: Platteville, Wisconsin
Posts: 574
If you disable the rear o2 sensor, you may fail a smog test simply because the catalyst readiness flag is set to incomplete even though there is no CEL.

I've noticed that disabling the rear o2 sensor causes my EVAP system to get pissed and the tank vent valve will shut all the time when the car is running. Then the ECU calls for EVAP purge and collapses the gas tank until the car is turned off causing a weird "breathing" sound as air rushes in the tank vent and the gas tank expands again. Enabling the rear o2 eliminates this problem. YMMV
PimpMyPc is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-24-2012, 03:30 PM   #7
TSLMember
 
Join Date: May 2012
Location: Los Angeles, CA
Posts: 49
Luckily I just passed smog test, before I put the tune in, so I have some time on this one. If I get any troubles with the EVAC System, I plug it back in.
Thanks for the note!
Mato is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the The Saab Link Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Vehicle Info.
Enter your vehicle information (year, model, mods)
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 03:44 AM.


Powered by vBulletin® Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.5.2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
All content is copyright The Saab Link and it's original authors.


 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.