Dreaded P0420 DTC - LS1GTO.com Forums

Vendors


Go Back   LS1GTO.com Forums > GTO Tech > Electronics

Reply
 
Thread Tools Rate Thread
Old 06-28-2019, 03:52 PM   #1
alscrimp
Registered User
 

Join Date: Oct 2018
Posts: 19


Offline
Dreaded P0420 DTC

Hey guys need your help! I keep getting that P0420 code and cannot seem to get rid of it. I have replaced all 4 oxygen sensors and the catalytic converters. It comes on at different times; like idling, standing in the gas, or just driving down the road. I also noticed the tailpipes were black and sooty. Any thoughts?
  Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 06-28-2019, 04:20 PM   #2
Nothubertjfarnsworth
ಠ_ಠ
 
Nothubertjfarnsworth's Avatar
 
2005 GTO Owner

Join Date: Sep 2006
Location: NWI
Posts: 34,113
Premium Member


Offline
Were the replacement cats new or used? OEM or aftermarket?
  Reply With Quote Quick reply to this message
Old 06-29-2019, 07:56 PM   #3
alscrimp
Registered User
 

Join Date: Oct 2018
Posts: 19


Offline
Quote:
Originally Posted by Nothubertjfarnsworth...View Post
Were the replacement cats new or used? OEM or aftermarket?

They are new JBA's.
  Reply With Quote Quick reply to this message
 
Old 06-29-2019, 08:32 PM   #4
Nothubertjfarnsworth
ಠ_ಠ
 
Nothubertjfarnsworth's Avatar
 
2005 GTO Owner

Join Date: Sep 2006
Location: NWI
Posts: 34,113
Premium Member


Offline
get new stock ones or get the code turned off by a tuner.
  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 LS1GTO.com 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:
Location
Where you live (must be accurate to IP location, if wrong you may be permanently banned)
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools
Rate This Thread
Rate This Thread:

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

Forum Jump


All times are GMT -8. The time now is 11:00 PM.




Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.