Login  |  Register
Nissanhelp.com - All About Nissan
Do-It-Yourself Maintenance Owners Manuals Recalls/Campaigns Service Bulletins Service Manuals Nissan OBDII Codes Glossary & Acronyms More...
Member's Ride Photos Stock Photo Gallery
Classifieds - For Sale Classifieds - Wanted To Buy Classifieds - Mechanic Wanted Classifieds - Auto Services Search Auto Parts
Register FAQ Social Groups Mark Forums Read
2000 Nissan Sentra Cats / Stalls Forums > > 2000 Nissan Sentra Cats / Stalls 2000 Nissan Sentra Cats / Stalls
Forgot Password? Join Us!


Sentra Nissan Sentra Discussion Forum

Reply
 
Thread Tools Display Modes
  #1  
Old 07-25-2011, 10:50 AM
jasong24 jasong24 is offline
Registered User
2000 Sentra
 
Join Date: Jul 2011
Posts: 12
Default 2000 Nissan Sentra Cats / Stalls

New here and think I need some help.
I have a 2000 Nissan Sentra with just shy of 100,000 miles on it. Recently the CEL came on and the active codes were P0420 (Catalyst System Efficiency Below Threshold (Bank 1)) and P0430 (Catalyst System Efficiency Below Threshold (Bank 2)). This seems to indicate that the catalytic converter is bad, but does this vehicle have one or two and are they both pre-cats or is there just one on the exhaust manifold and another further downstream on the exhaust. I have also seen on other posts on this forum that there are certain VINs where the ECM should be reprogrammed. Is there any way to tell if this applies to mine? I called a local dealer, but they were unable to determine anything over the phone. There does not seem to be any restriction on the exhaust, but it does smell a little rich to me. It has also recently stalled when coming to or at a stop twice now, but I am not sure if this is related or not. Does anyone have any advice or answers to the above questions or any other possible solutions to these symptoms?
Thank you for any help you can provide.

Last edited by jasong24; 07-25-2011 at 10:57 AM.
Reply With Quote
  #2  
Old 07-25-2011, 11:48 AM
JudoJohn JudoJohn is offline
Master Enthusiast
2002 Sentra
2003 Sentra
2002 Sentra GXE
 
Join Date: Aug 2007
Location: St. Louis
Posts: 507
Default

it is proibably your O2 sensor(s). they control mixture, or rather give the ECU info on wht the mixture is. If they give bad info, engine can run too rich or lean. If that happens, then eventually the cat will go.
Reply With Quote
  #3  
Old 07-25-2011, 11:51 AM
jasong24 jasong24 is offline
Registered User
2000 Sentra
 
Join Date: Jul 2011
Posts: 12
Default

Thanks for the reply,
Would there not be one of the other codes present indicating a faulty 02 sensor?
Reply With Quote
  #4  
Old 07-25-2011, 11:54 AM
jasong24 jasong24 is offline
Registered User
2000 Sentra
 
Join Date: Jul 2011
Posts: 12
Default

Also, if this is the case how could I determine which one(s) is it? I believe there are 4 on this vehicle and I have both error codes present.
Reply With Quote
  #5  
Old 07-25-2011, 06:43 PM
JudoJohn JudoJohn is offline
Master Enthusiast
2002 Sentra
2003 Sentra
2002 Sentra GXE
 
Join Date: Aug 2007
Location: St. Louis
Posts: 507
Default

not sure, look it up in the FSM.
Reply With Quote
  #6  
Old 07-25-2011, 07:25 PM
jasong24 jasong24 is offline
Registered User
2000 Sentra
 
Join Date: Jul 2011
Posts: 12
Default

There are additional codes that would lead me to believe the 02 sensor(s) would be bad before these. After some research I think I have accepted that the cat is defiantly bad, but I have not had the opportunity to remove the heat shield or anything to see what is actually there. Do you know if 1.8L engine a 2000 model is susceptible to the problems of cat fragments getting sucked into the engine that everyone seems to fear or is that only 2002 and later models?
Thanks again for helping!
Reply With Quote
  #7  
Old 07-26-2011, 09:00 AM
JudoJohn JudoJohn is offline
Master Enthusiast
2002 Sentra
2003 Sentra
2002 Sentra GXE
 
Join Date: Aug 2007
Location: St. Louis
Posts: 507
Default

that's for the 2.5 engine, not the QG18. Just so you know, if it is the O2 sensor, and it is causing a rich condition, replacing the cat and not fixing the O2 sensor will foul up the new cat, too.
Reply With Quote
  #8  
Old 07-26-2011, 09:23 AM
jasong24 jasong24 is offline
Registered User
2000 Sentra
 
Join Date: Jul 2011
Posts: 12
Default

Would it likely be the 02 sensors before or after the cat that would cause this issue?
Reply With Quote
  #9  
Old 07-26-2011, 10:31 AM
mike_s mike_s is offline
Enthusiast
2003 Sentra
2003 Sentra SE-R
 
Join Date: Dec 2009
Location: Minnesota
Posts: 61
Default

I had the same codes thrown on my 2.5 and removed the pre-cat by installing a new exhaust manifold without one and used an anti-fouler extension for the 1st O2 sensor. I have never had problem since (knock on wood) and no codes thrown since the Cat-Delete. I initially thought it would be the O2 sensor failing, but it turned out to infact be the cat.
Reply With Quote
Reply

Tags
2000, cats, nissan, sentra, stalls

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



All times are GMT -8. The time now is 12:59 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO v2.0.42 (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.