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P0420 NIGHTMARE!!!!
(
1
2
3
)
infamous107
on 12-22-2010
12-28-2023
09:32 AM
by
trackfactory
22
217,318
1.8T Discussion
p0420 fault code on 2006 Audi A3
liern
on 07-01-2012
07-01-2012
07:55 AM
by
liern
0
5,541
Audi A3 / S3 / RS 3
P0420 CAT OR 02 sensor? 2.8l FWD
rohit13
on 12-21-2011
12-23-2011
11:08 AM
by
rohit13
9
6,558
A6 / S6 (C5 Platform) Discussion
Help with engine codes P0299 and P0420
mongs
on 02-01-2010
07-14-2011
01:06 PM
by
mongs
4
17,761
A4 (B6 Platform) Discussion
Replaced Cat - P0420 returns. Now What?
mwspera
on 04-26-2009
03-02-2011
02:57 AM
by
infamous107
7
6,540
A4 (B6 Platform) Discussion
PLEASE HELP - Turning on code P0420
sbrimlow
on 02-12-2010
02-15-2010
04:12 PM
by
Dana @ Ross-Tech
1
2,803
VAG-COM Discussion
2002 A4 1.8t stalling/won't start
(
1
2
)
bboissonneault
on 01-21-2010
02-07-2010
11:44 AM
by
bboissonneault
12
16,874
VAG-COM Discussion
Help me figure out my boost problem!!!
uamishka
on 10-20-2009
10-25-2009
01:49 PM
by
uamishka
9
1,220
A4 (B5 Platform) Discussion
P0420 Cat or what
Mrider
on 06-21-2009
08-20-2009
08:28 AM
by
JWhalen123
3
6,109
A4 (B6 Platform) Discussion
likelihood? both cats go at the same time?
BoneDaddy
on 07-03-2008
07-04-2008
06:09 PM
by
audikillsbmw
9
607
A6 / S6 (C5 Platform) Discussion
What can be wrong if I get P0420 Engine Check Code - Catalyst efficiency low bank 1
kgrig
on 02-17-2008
02-17-2008
08:04 PM
by
Audi_kraut
6
13,372
A4 (B5 Platform) Discussion
Need P0421 and P0420 ghetto fix - already STFU
Silver02A4Quattro
on 04-06-2007
04-08-2007
03:27 PM
by
MM120
9
5,668
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 08-24-2005
08-24-2005
05:35 PM
by
lolyf
9
1,038
A4 (B5 Platform) Discussion
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