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P0420 NIGHTMARE!!!!
(
1
2
3
)
infamous107
on Dec 22, 2010
Dec 28, 2023
09:32 AM
by
trackfactory
22
262,072
1.8T Discussion
p0420 fault code on 2006 Audi A3
liern
on Jul 1, 2012
Jul 1, 2012
07:55 AM
by
liern
0
6,064
Audi A3 / S3 / RS 3
P0420 CAT OR 02 sensor? 2.8l FWD
rohit13
on Dec 21, 2011
Dec 23, 2011
11:08 AM
by
rohit13
9
6,857
A6 / S6 (C5 Platform) Discussion
Help with engine codes P0299 and P0420
mongs
on Feb 1, 2010
Jul 14, 2011
01:06 PM
by
mongs
4
19,310
A4 (B6 Platform) Discussion
Replaced Cat - P0420 returns. Now What?
mwspera
on Apr 26, 2009
Mar 2, 2011
02:57 AM
by
infamous107
7
6,924
A4 (B6 Platform) Discussion
PLEASE HELP - Turning on code P0420
sbrimlow
on Feb 12, 2010
Feb 15, 2010
04:12 PM
by
Dana @ Ross-Tech
1
3,277
VAG-COM Discussion
2002 A4 1.8t stalling/won't start
(
1
2
)
bboissonneault
on Jan 21, 2010
Feb 7, 2010
11:44 AM
by
bboissonneault
12
17,928
VAG-COM Discussion
Help me figure out my boost problem!!!
uamishka
on Oct 20, 2009
Oct 25, 2009
01:49 PM
by
uamishka
9
1,308
A4 (B5 Platform) Discussion
P0420 Cat or what
Mrider
on Jun 21, 2009
Aug 20, 2009
08:28 AM
by
JWhalen123
3
6,778
A4 (B6 Platform) Discussion
likelihood? both cats go at the same time?
BoneDaddy
on Jul 3, 2008
Jul 4, 2008
06:09 PM
by
audikillsbmw
9
719
A6 / S6 (C5 Platform) Discussion
What can be wrong if I get P0420 Engine Check Code - Catalyst efficiency low bank 1
kgrig
on Feb 17, 2008
Feb 17, 2008
08:04 PM
by
Audi_kraut
6
14,656
A4 (B5 Platform) Discussion
Need P0421 and P0420 ghetto fix - already STFU
Silver02A4Quattro
on Apr 6, 2007
Apr 8, 2007
03:27 PM
by
MM120
9
5,926
A4 (B6 Platform) Discussion
If I get the P0420 code, which cat or O2 is bad? The one right after the turbo or the next one?
krue92
on Aug 24, 2005
Aug 24, 2005
05:35 PM
by
lolyf
9
1,200
A4 (B5 Platform) Discussion
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