B6 Models Please discuss all 2002 - 2005 B6 A4 topics here...

P0421 & P0431 for years...

  #11  
Old 11-23-2013, 01:17 PM
1st Gear
Thread Starter
Join Date: Aug 2013
Posts: 17
Default

Originally Posted by jtblue View Post
The guy complained of bad fuel economy so its probably the pre cat sensors. The faults been on the dash for years so the faulty cat and sensors should be replaced but I don't think its a high priority that's all

Edit: yeah I was wrong, my logic made sense at the time. Replacing all 4 o2 sensors and cats will rid the fault and should return both power and fuel economy.
Can someone point me to any DIY on replacing the O2 sensors?
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
TheCounty
B5 Models
0
12-03-2012 09:12 PM
AnthonyVas79
B6 Models
2
04-08-2012 11:48 PM
bigdadi
Audi A6
1
10-25-2010 09:55 AM
monkey323i
B6 Models
1
04-28-2008 11:05 PM
jlewis166
Audi A6
4
09-08-2007 09:06 AM


Thread Tools
Search this Thread
Quick Reply: P0421 & P0431 for years...


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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.