Chevrolet Forum - Chevy Enthusiasts Forums

Notices
Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900

PCM code P0 420

Thread Tools
 
Search this Thread
 
Old September 19th, 2012, 8:40 PM
  #1  
CF Beginner
Thread Starter
 
dstill9's Avatar
 
Join Date: Sep 2012
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default PCM code P0 420
Is this the post oxygen sensor?
dstill9
dstill9 is offline  
Reply Like
Old September 19th, 2012, 9:47 PM
  #2  
Super Moderator
Professional Mechanic
 
MDTAHOE's Avatar
 
Join Date: Nov 2008
Location: Bowie, MD
Posts: 2,950
Likes: 0
Received 3 Likes on 3 Posts
Default
PO420 is catalyst efficiency low bank 1. You need a cat converter.
MDTAHOE is offline  
Reply Like
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
PCM?
chadt256
Silverado & Fullsize Pick-ups
1
October 14th, 2008 9:13 AM
PCM
Forgreed
Impala
1
February 16th, 2008 8:01 AM
PCM Data Stream Freeze
sschnelle
General Tech
1
December 23rd, 2007 10:10 PM
Trans - PCM Update
rat55chevy
Tahoe & Suburban
3
March 23rd, 2007 3:11 PM
2002 chevy silverado pcm
Drock77
Silverado & Fullsize Pick-ups
0
March 10th, 2007 10:09 AM
Tags
Back to Subforum
Silverado & Fullsize Pick-ups
View Next Unread
Looking for New steering shaft




Advanced Search
Quick Reply: PCM code P0 420


Reply Closed Thread Share

All times are GMT -5. The time now is 1:04 AM.