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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 12-22-2010

12-28-2023 09:32 AM
by trackfactory

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22

216,600

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 07-01-2012

07-01-2012 07:55 AM
by liern

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0

5,533

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 12-21-2011

12-23-2011 11:08 AM
by rohit13

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9

6,553

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 02-01-2010

07-14-2011 01:06 PM
by mongs

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4

17,743

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 04-26-2009

03-02-2011 02:57 AM
by infamous107

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7

6,537

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 02-12-2010

02-15-2010 04:12 PM
by Dana @ Ross-Tech

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1

2,799

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 01-21-2010

02-07-2010 11:44 AM
by bboissonneault

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12

16,865

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 10-20-2009

10-25-2009 01:49 PM
by uamishka

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9

1,219

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 06-21-2009

08-20-2009 08:28 AM
by JWhalen123

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3

6,101

A4 (B6 Platform) Discussion

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

likelihood? both cats go at the same time?

BoneDaddy on 07-03-2008

07-04-2008 06:09 PM
by audikillsbmw

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9

607

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 02-17-2008

02-17-2008 08:04 PM
by Audi_kraut

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6

13,349

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 04-06-2007

04-08-2007 03:27 PM
by MM120

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9

5,668

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 08-24-2005

08-24-2005 05:35 PM
by lolyf

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9

1,038

A4 (B5 Platform) Discussion

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