p0420 code on 2002 lasabre - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 07-26-2015, 08:35 PM   #1
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: May 2014
Location: NC
Posts: 100
Thanked 15 Times in 13 Posts
parker2129 will become famous soon enough
Default p0420 code on 2002 lasabre

Hello everyone,

I am getting a p0420 code on my 2002 Buick Lasabre. The cat. is 4 yrs old, the front sensor is 2 or 3 yrs old. The rear sensor is original. I am wondering if it would make sense to replace rear sensor and hope it takes care of problem or go through the trouble and expense of having the system checked. at garage.

I haven't noticed any symptoms. Any advice appreciated.
parker2129 is offline   Reply With Quote
Old 07-26-2015, 11:54 PM   #2
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,142
Thanked 778 Times in 608 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

You can go Autozone, and they can plot data on their scan tool, for the front and rear O2 sensors...if the rear, mirrors the front, need a cat...the front should be rapidly changing while the rear should be very slow in comparison.....if the rear mirrors, or changes rapidly like the pre O2 sensor, need a cat...
Tech II is offline   Reply With Quote
Old 07-27-2015, 08:35 AM   #3
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: May 2014
Location: NC
Posts: 100
Thanked 15 Times in 13 Posts
parker2129 will become famous soon enough
Default

Thanks for the info Tech II. I was not aware that Autozone could do that kind of scan.
parker2129 is offline   Reply With Quote
Old 07-27-2015, 09:13 AM   #4
Senior Member
Posts like a Supercharger
 
Mad_Coachman's Avatar
 
Join Date: Dec 2003
Location: Baldwin,New York
Posts: 164
Thanked 20 Times in 13 Posts
Mad_Coachman will become famous soon enoughMad_Coachman will become famous soon enough
Default

Quote:
Originally Posted by parker2129 View Post
Hello everyone,

I am getting a p0420 code on my 2002 Buick Lasabre. The cat. is 4 yrs old, the front sensor is 2 or 3 yrs old. The rear sensor is original. I am wondering if it would make sense to replace rear sensor and hope it takes care of problem or go through the trouble and expense of having the system checked. at garage.

I haven't noticed any symptoms. Any advice appreciated.
For 30 bucks you could try an O2 simulator. Just do a Google search for O2 simulator. I used the stainless steel adaptor from Big Daddies Garage. my 420 code never came back!!!! It moves the tip of your oxygen sensor out of the direct stream of exhaust so that your PCM now thinks that your cat is doing its job.
Mad_Coachman is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2001 lasabre pcm to a 2002 bonneville 2002 bonneville se General GM Chat 5 09-03-2013 07:49 AM
2002 Buick Lasabre wally.1962 Buick 3 06-18-2013 09:08 PM
Make your own SES light eliminator- Code P0420 Black Pearl 2000-2005 1 07-20-2009 11:27 AM
code p0420? BLKssei02 Performance, Brainstorming & Tuning 9 11-07-2008 07:26 PM
1998 Random cylinder misfires and code P0420 jllracer55 1992-1999 0 10-07-2008 12:41 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -4. The time now is 10:47 PM.


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 Amazon.com and affiliated sites.