Log In
Register
Forums
General
New Member Welcome Area
Off Topic
Brand News, Concepts & Rumors
Sights N Sounds
Chop Shop
Ride Of The Month
Dealerships & Mechanics
Audi Tech
General Tech
DIY - Do It Yourself
Electronics
Computer & Fuel Systems
VAG-COM
Intake, Headers and Exhaust
Suspension
Interior
Exterior
Nitrous, Super Chargers, & Turbos
Wheels and Tires
Detailing
Member Builds/Projects
Audi Models
Audi A1
Audi A2
Audi A3
Audi A4
Audi A5
Audi A6
Audi A7
Audi A8
Audi TT
Audi Q Model Line
S Car Model Line
Allroad Model Line
RS Model Line
R8
Classic Audi
All Other Audi Models
Racing / Recreational
Off Road
Street/Strip
Professional Racing
Show Time
Site Vendors & Sponsors
Vendors 'For Sale' Classifieds
Special/Group Buy Classifieds
The *new* Audi Marketplace
Archived Audi Classifieds
Archive - Vehicles for Sale
Archive - Engine/Performance Parts
Archive - Wheels/Brakes/Suspension
Archive - Exterior/Body
Archive - Interior/Electrical/Stereo
Archive - Misc Items for Sale
Archive - Want to Buy
Regional
North East
Central
South West
West
Mid West
Mid-Atlantic
South
Canada, Over Seas & Elsewhere
Other
Forum Issues
Gallery
Tools
Car Payment Calculator
Tire Rim Calculator
Vin Decoder
Members List
Live Feed
Marketplace
Vendor Directory
Become a Vendor
The Audi Marketplace
New Posts
View Dark Mode
Please register or login to enable Dark Mode.
Log In
Register
Threads
Google
Threads
Posts
Advanced
AudiForums.com
Log In
|
Register
Dark Mode
Please register or login to enable Dark Mode.
Contact Us
Manage Preferences
Archive
Advertising
Cookie Policy
Privacy Statement
Terms of Service
Your Privacy Choices
Affiliate Disclosure
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
×
Log In
Forgot your Password?
By logging into your account, you agree to our
Terms of Use
and
Privacy Policy
, and to the use of cookies as described therein.
or
Login with Facebook
AudiForums.com
Tags
Threads Tagged with
p0421
Community Links
Pictures & Albums
Members
Search Forums
Show Threads
Show Posts
Tag Search
Advanced Search
Go to Page...
Page 3 of 3
<
1
2
3
Threads Tagged with
p0421
Thread / Thread Starter
Last Post
Replies
Views
Forum
still misfires, now random
DSMKiller
on 05-02-2009
05-03-2009
01:27 PM
by
bottlecap
7
984
S Car Model Line
Error Code P0431
twinturbosixer
on 04-15-2009
04-15-2009
11:25 AM
by
hxgaser
1
5,092
Audi A6
Catalytic converter question 2000 A6 2.7T
jgurland
on 12-14-2007
02-23-2009
05:51 PM
by
eek
5
7,521
General Tech
check engine light from fuel sys cleaner ??
(
1
2
3
)
graybno
on 01-31-2009
02-12-2009
08:41 AM
by
padog
29
7,736
Audi A6
P0421 error 1 Cat or 2?
Madtown
on 09-03-2008
01-14-2009
09:00 PM
by
5th_year_senior
2
1,485
General Tech
New ride, and a few problems...
(
1
2
3
)
crazyguy
on 12-14-2008
12-17-2008
08:50 AM
by
crazyguy
28
3,666
Audi A6
P0421
snr1951
on 05-07-2008
05-08-2008
12:42 PM
by
auditurbo381
2
1,134
B6 Models
P0431, P0421 codes, help!!
monkey323i
on 04-27-2008
04-28-2008
11:05 PM
by
AudiTech616
1
3,205
B6 Models
PLease Help 2 Catalytic Converters bad, codes P0421, P0431, P1557, P1127
bslags
on 03-27-2008
03-27-2008
11:23 AM
by
bslags
0
2,663
Intake, Headers and Exhaust
Lots of codes, but few symptoms...help?
jgurland
on 01-28-2008
01-29-2008
08:51 PM
by
jgurland
4
1,726
General Tech
Code P0421 PLEASE READ
COJAM
on 11-20-2007
11-24-2007
08:14 PM
by
COJAM
9
6,637
Audi A6
Code p0421
typhoonfd
on 11-23-2007
11-23-2007
10:00 AM
by
typhoonfd
4
1,852
S Car Model Line
Got an 2000 A6 2.7t w/ p1423 & P0421
chromatin
on 10-30-2007
10-30-2007
08:49 PM
by
JCMAC
1
3,600
Audi A6
2003 A4 3.0L Quattro, codes P0421 and P0431, now also P0300, P0301, P0303 & P0304
rerodriguez11
on 10-16-2007
10-16-2007
04:40 PM
by
techbod
4
11,589
Audi A4
2003 A4 3.0L Quattro, codes P0421 and P0431
rerodriguez11
on 10-04-2007
10-06-2007
02:38 PM
by
rerodriguez11
1
4,574
Audi A4
CODE P0421 and P0431
jlewis166
on 09-07-2007
09-08-2007
09:06 AM
by
jlewis166
4
4,724
Audi A6
2002 s4 b5.. need help
Spyroot
on 12-22-2006
12-26-2006
07:55 PM
by
Baskin 4.2l
6
3,232
S Car Model Line
2000 2.7T
bari7230
on 10-23-2006
10-23-2006
06:32 PM
by
bari7230
0
1,486
Audi A6
She is fixed!!!!!! UPDATE: Multiple error codes...pelase help
(
1
2
)
matt1colorado
on 08-03-2006
08-21-2006
11:12 PM
by
matt1colorado
17
12,742
General Tech
Page 3 of 3
<
1
2
3
All times are GMT -4. The time now is
07:25 AM
.