Login  |  Register
Nissanhelp.com - All About Nissan
All Models, All Years 2014 370Z Coupe 2014 370Z Coupe Nismo 2014 370Z Roadster 2013 Altima Coupe 2014 Altima Sedan 2014 Armada 2014 Cube 2014 Frontier Crew 2014 Frontier King 2014 GT-R 2014 JUKE 2014 JUKE NISMO 2013 Leaf 2014 Maxima
2014 Murano 2013 CrossCabriolet 2013 NV Cargo 2013 NV Passenger 2013 NV200 2014 Pathfinder 2014 Pathfinder Hybrid 2014 Quest 2014 Rogue 2014 Sentra 2014 Titan Crew 2014 Titan King 2014 Versa Note 2014 Versa Sedan 2014 Xterra Concept Models
MyNissan Do-It-Yourself Maintenance Owners Manuals Recalls/Campaigns Service Bulletins Service Manuals Tech Challenge Game Nissan OBDII Codes Glossary & Acronyms Cost Estimator More...
Member's Ride Photos Stock Photo Gallery
Classifieds - For Sale Classifieds - Wanted To Buy Classifieds - Mechanic Wanted Classifieds - Auto Services Search Auto Parts Ultimate Reflector Auto Sun Shades Custom Fit Car Covers Auto Snow Shades Berber Auto Mats Coco Auto Mats Designer Auto Mats Diamond Plate Auto Mats Fashion Auto Mats Flexomats Auto Mats Hexomats Auto Mats
Register FAQ Social Groups Mark Forums Read
Forums Nissan Models Altima 05 nissan altima diagnostic code
Forgot Password? Join Us!


Altima Nissan Altima Sedan Discussion Forum

User Tag List

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 01-06-2010, 10:49 AM
michelle15214's Avatar
Registered User
2005 Altima
 
Join Date: Jan 2010
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Thumbs down 05 nissan altima diagnostic code

I was informed today that I have a diagnostice code p0420 - catalyst efficiency below threshold (bank 1)...can someone explain to me exactly what this defines..went to shop and told I need to replace catalytic converter and two o2 sensors...is this true? if so, will it remedy problem...thanks for any assistance
Reply With Quote
  #2 (permalink)  
Old 01-06-2010, 01:46 PM
05 2.5 alt dawg's Avatar
Registered User
2005 Altima
2005 2.5 altima
 
Join Date: Jul 2009
Location: florida
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

How many miles do you have on your altima? Cat Converter is covered for 80,000 miles. Mine went out at 80,379. Bad cats seem to be pretty common for these altimas.
Reply With Quote
  #3 (permalink)  
Old 01-06-2010, 02:32 PM
michelle15214's Avatar
Registered User
2005 Altima
 
Join Date: Jan 2010
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

I'm actually at 115,000 and some change... I guess by your reply the converter will need replaced...I have an estimate for $815.00 which includes converter two 02 sensors and labor...thanks for replying

Last edited by michelle15214; 01-06-2010 at 02:35 PM.
Reply With Quote
  #4 (permalink)  
Old 01-06-2010, 03:31 PM
05 2.5 alt dawg's Avatar
Registered User
2005 Altima
2005 2.5 altima
 
Join Date: Jul 2009
Location: florida
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

Your estimate sounds reasonable. Around 600 for parts and 2 or 3 hrs labor. Happy new year!!
Reply With Quote
  #5 (permalink)  
Old 01-13-2010, 06:06 PM
nisaltima's Avatar
Registered User

2005 nissan altima
 
Join Date: Aug 2007
Location: Houston
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

p0420(bank 1) which cat is this? Have same code in my Altima which has 115K miles. Can do the work myself just not sure which one it is. Is it the one attached to exhaust manifold or the one more towards the rear?
Reply With Quote
  #6 (permalink)  
Old 01-14-2010, 02:49 AM
05 2.5 alt dawg's Avatar
Registered User
2005 Altima
2005 2.5 altima
 
Join Date: Jul 2009
Location: florida
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

I think bank 1 is the one in the exhaust manifold. A lot of altima owners have had problems with this part. I just replaced mine 2 weeks ago. I replaced the stock manifold with cat with an after market header without a cat and a spark plug non fouler on the 2nd oxygen sensor to trick the ECM and turn off the SEL light. Total cost was $150 vs. $600 at the shop. Other than the heat shields, the only part you have to remove to get to all the manifold bolts is the alternator.
Reply With Quote
  #7 (permalink)  
Old 01-14-2010, 08:09 AM
nisaltima's Avatar
Registered User

2005 nissan altima
 
Join Date: Aug 2007
Location: Houston
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

Thanks alt dawg! I was thinking about that but I live in Texas and we have yearly inspections, which include emissions. Doing this would my car still pass inspections? It still has the other cat farther down the exhaust. And I'm not sure if they do visual inspectios here in Texas like they do in California. May have to stop by an inspection place and ask a few questions. Also the 2nd oxygen sensor is this the one under the car or one attached in the manifold? Thanks again
Reply With Quote
  #8 (permalink)  
Old 01-14-2010, 08:40 AM
nisaltima's Avatar
Registered User

2005 nissan altima
 
Join Date: Aug 2007
Location: Houston
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

Sorry...one more question. Going with aftermarket header how much change in exhaust noise did you notice? How much louder was it?
Reply With Quote
  #9 (permalink)  
Old 01-14-2010, 12:21 PM
ardenmann's Avatar
Tech Enthusiast
1994 Altima
 
Join Date: Sep 2009
Posts: 129
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

It's "illegal" to tamper with emission control device
Reply With Quote
  #10 (permalink)  
Old 01-14-2010, 01:36 PM
05 2.5 alt dawg's Avatar
Registered User
2005 Altima
2005 2.5 altima
 
Join Date: Jul 2009
Location: florida
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

It's not much louder but the pitch sounds different. My car runs better(quicker throttle response). I definately would not recommend removing the cat if you have to do emissions testing. But there are some aftermarket manifolds with a cat that are cheaper( i think I saw one for about 250) than the OEM part and its not a hard part to replace. With all the people I've heard talking about this part going bad, there was no way I was going to put a new defective Nissan part to replace an old defective Nissan part.
Reply With Quote
  #11 (permalink)  
Old 01-29-2010, 01:49 PM
clutchknight's Avatar
Registered User
2003 Altima
1996 Pathfinder
 
Join Date: Apr 2009
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

i am in texas as well and i am getting an new pre cat in about an hr, and will be changing it myself tomorrow morning. bankston nissan has it for $409.48
Reply With Quote
Reply

Bookmarks

Tags
altima, code, diagnostic, nissan

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 On
Pingbacks are On
Refbacks are Off



All times are GMT -8. The time now is 03:17 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.0
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.