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0420, 18l, 18t, 2001, 2002, 30, a4, audi, code, finally, fix, found, p0420, po420, reason, tt, vacuum

P0420 NIGHTMARE!!!!

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Multi-page thread

1 2 3)

infamous107 on Dec 22, 2010

Dec 28, 2023 09:32 AM
by trackfactory

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22

262,072

1.8T Discussion

0420, 16804, 18t, 2001, 42, a3, a4, a6, a8l, audi, code, codes, common, fault, p0420, po420, q5

p0420 fault code on 2006 Audi A3

liern on Jul 1, 2012

Jul 1, 2012 07:55 AM
by liern

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0

6,064

Audi A3 / S3 / RS 3

1999, 2001, 27t, 28, 99, a4, a6, audi, b8, code, denali, gmc, p0420, po420, vag, yukon

P0420 CAT OR 02 sensor? 2.8l FWD

rohit13 on Dec 21, 2011

Dec 23, 2011 11:08 AM
by rohit13

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9

6,857

A6 / S6 (C5 Platform) Discussion

18t, 2003, 2004, a4, a6, audi, b6, code, codes, engine, p0299, p0420, po299, po420, tts

Help with engine codes P0299 and P0420

mongs on Feb 1, 2010

Jul 14, 2011 01:06 PM
by mongs

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4

19,310

A4 (B6 Platform) Discussion

18t, 2001, a4, a6, audi, b5, cat, causing, code, forum, leak, p0420, po420, replaced, returns, tt, vag

Replaced Cat - P0420 returns. Now What?

mwspera on Apr 26, 2009

Mar 2, 2011 02:57 AM
by infamous107

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7

6,924

A4 (B6 Platform) Discussion

1996, 2000, 2004, a4, a6, audi, chevy, code, p0420, po420, procedure, testing, throwing, truck, vag, vr6

PLEASE HELP - Turning on code P0420

sbrimlow on Feb 12, 2010

Feb 15, 2010 04:12 PM
by Dana @ Ross-Tech

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1

3,277

VAG-COM Discussion

02, 16804, 18t, 2001, a4, audi, b5, brakes, engine, loss, po420, radio, sensor, stall, stalled, start, steering, taking, wont

2002 A4 1.8t stalling/won't start

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Multi-page thread

1 2)

bboissonneault on Jan 21, 2010

Feb 7, 2010 11:44 AM
by bboissonneault

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12

17,928

VAG-COM Discussion

18t, 27t, 99, a6, boost, hissing, lean, mixture, noise, pipe, po420, s10, test

Help me figure out my boost problem!!!

uamishka on Oct 20, 2009

Oct 25, 2009 01:49 PM
by uamishka

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9

1,308

A4 (B5 Platform) Discussion

01, 2001, 2003, a4, a6, audi, b5, cat, code, forum, o2, p0420, po420, s8, sensor

P0420 Cat or what

Mrider on Jun 21, 2009

Aug 20, 2009 08:28 AM
by JWhalen123

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3

6,778

A4 (B6 Platform) Discussion

2001a6, 2002, audi, bonneville, codes, p0420p0430, po420, pontiac

likelihood? both cats go at the same time?

BoneDaddy on Jul 3, 2008

Jul 4, 2008 06:09 PM
by audikillsbmw

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9

719

A6 / S6 (C5 Platform) Discussion

06, 20t, a4, aeb, audi, code, dts, lifestyle, long, p0420, po420, price, ride, safe, trip, v35, vagcom

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

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6

14,656

A4 (B5 Platform) Discussion

18, 2002, 2004, a4, apr, audi, b6, b7, cheap, escort, fix, p0420, p0421, po420, resistor

Need P0421 and P0420 ghetto fix - already STFU

Silver02A4Quattro on Apr 6, 2007

Apr 8, 2007 03:27 PM
by MM120

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9

5,926

A4 (B6 Platform) Discussion

a4, audi, b1, b5, cat, code, e320, lexxcat, o2s, p0420, po420

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

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9

1,200

A4 (B5 Platform) Discussion

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