Threads Tagged with p0421

A4 (B5 Platform) Discussion

02, 2000, 2002, 2004, a4, a6, audi, catalytic, code, converter, fault, p0421, quattro, s4, shows, vw

Code P0421 was NOT catalytic converter

dpeverhart on Feb 24, 2010

Oct 7, 2014 11:30 AM
by Prospeeder

6

27,363

fixed 16805 P0421 with O2 extender

johnkk on Sep 22, 2013

Sep 22, 2013 06:46 AM
by johnkk

0

2,583

2002, 2003, 30, a4, a6, audi, avk, b6, octane, oxygen, p0421, p042193, quattro, s4, sensor, v6, warranty

P0421 already replaced cat

Kombi03 on Feb 5, 2013

Feb 14, 2013 03:58 PM
by 2000_A6_2.8_Avant

4

3,497

1995, 2001, 27, allroad, audi, coolant, cruiser, engine, land, p0421, sensor, start, temperature, turn, wont

Allroad Won't Start, Please Help

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1 2)

mmasner on Feb 6, 2013

Feb 12, 2013 06:22 PM
by mmasner

17

41,296

Audi allroad

02, 2002, 2004, 30, 30v, a4, audi, avk, b6, check, code, coils, engine, light, mileage, misfire, p0421, po421

P0421 and misfires 04 A4 3.0

blueskymine on Sep 14, 2012

Sep 20, 2012 01:57 PM
by ct_esq

2

4,041

P0421 and Gas -- anyone had similar story?

a4avant99 on May 25, 2012

May 25, 2012 10:56 AM
by 2.7Lturbo

7

2,355

audi, b5, catalytic, cel, clear, code, engine, error, intermittent, lacquer, laquer, p0421, p0431, s4, thinner

2001 S4, CEL/Catalytic Issues

yakavish on Mar 21, 2012

Apr 9, 2012 03:16 PM
by yakavish

9

4,665

2002, 2004, audi, cat, denali, large, leak, p0421, p0431, p0455, pre, temp, warm, xl, yukon

Trouble getting through emissions testing

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1 2 3)

M4NB00B5 on Jan 24, 2012

Jan 26, 2012 05:50 PM
by jcman

20

6,539

16805, 16815, 2000, a6, audi, bank, cat, catalyst, code, efficiency, low, p0421, p0431, quattro, treshold, trouble, warm

Fault codes:P0431,P0421,P1603-intermittent?

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1 2 3)

tmaslar on Jan 20, 2007

Nov 21, 2011 11:52 AM
by 02ALLROAD02

24

49,349

VAG-COM Discussion

1996, 2001, 30, a4, a6, audi, code, forum, foulers, mazda, miata, p0421, plu, plug, plugs, replace, s4, spark

P0421, spark plug replaced, then ABS and ESP

a4avant99 on Nov 6, 2011

Nov 11, 2011 01:48 PM
by a4avant99

8

5,464

2002, a4, a6, allroad, audi, audiworld, b6, code, codes, engine, log, o2, p0421, p0431, trouble

Codes P0421 and P0431

ShadowF on Aug 13, 2011

Aug 13, 2011 03:31 PM
by ShadowF

0

5,033

30, allroad, audi, audiworld, catalic, catalytic, cheap, converter, fix, fixes, flash, forums, p0141, p0421, spacer

Catalytic Converter - Cheap Fix from Dealer

2002 allroad on Apr 21, 2011

Jul 8, 2011 10:33 AM
by O2Allroad

7

20,388

2.7T V6 Discussion

APR fix vrs TSB fix at audi

(

1 2)

mikester2008 on Jun 10, 2011

Jun 14, 2011 05:42 AM
by thejulex

10

2,213

Audi allroad

audi, blocks, car, constant, cylinder, failure, icm, intermittant, intermittent, make, measuring, misfire, miss, p0421, speed, vag

Miss while at constant speed

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1 2 3)

normohl on May 9, 2011

May 15, 2011 05:54 PM
by EuroXS4

28

4,627

02, 2002, 2003, 30, a4, audi, catalytic, code, converter, exhaust, leak, p0421, quattro, vaccum, vacuum

p0421, yay (specific question)

(

1 2)

DZA on Mar 21, 2008

Apr 9, 2011 07:59 PM
by theugly02

12

3,028

catalytic code

host23age on Nov 19, 2010

Mar 23, 2011 01:56 PM
by ryan_qttro

3

3,803

30v V6 Discussion

02, 18t, 1999, 2002, 30, a4, a6, audi, bank, code, idle, ii, o2, obd, p0421, quattro, rough, sensor, warmed

B6 A4 or D2 A8?

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1 2 3)

A84Nate on Oct 29, 2010

Nov 19, 2010 07:06 PM
by A84Nate

25

3,646

air, audi, injection, p0421, p1411, p1423, po421, s4, secondary

P0421 and other MILs

2000_A6_2.8_Avant on Nov 19, 2010

Nov 19, 2010 04:54 PM
by 2000_A6_2.8_Avant

0

1,576

Codes??

jrc922 on Oct 26, 2010

Oct 28, 2010 10:25 AM
by jrc922

5

2,081

16805, 2002, 30, a4, a6, audi, audy, code, codes, error, fault, list, message, p0421, quattro, vag

2002 Audi A6 Quattro Error Code Help

l_smith on Aug 4, 2010

Aug 6, 2010 11:29 AM
by Dana @ Ross-Tech

3

3,774

VAG-COM Discussion

42, audi, bank1, catalitic, catalytic, catylic, codes, converter, convertor, ct, mechanic, miata, milford, p0421, p0431, reflash, return, weigh

Catalytic Converter Opinions - Please Weigh In

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1 2 3)

ilsaccente on May 25, 2010

May 28, 2010 04:42 AM
by ilsaccente

23

6,052

2003, 27t, 30, a4, audi, b6, bad, bosch, coil, o2, p0421, recall, s4, sensor, sensors

P0421 May Just Be O2 Sensors

tecoya on May 12, 2010

May 14, 2010 10:33 AM
by Pete@ECSTuning

4

2,221

2004, 27t, a6, audi, cat, clear, code, delete, engine, p0421, po421, replacement, s4

P0421 - Cat code

greenquattro on May 1, 2010

May 1, 2010 06:34 PM
by VONBOTTLE

1

2,594

18t, audi, catalytic, catilac, conver, converter, efficiency, is, operating, p0421, precatalytic, primary, s4, threshold, warm

Pre or Primary Catalytic Converter Question

conall on Mar 22, 2010

Mar 24, 2010 05:52 PM
by conall

1

1,388

01119, 01592, 02262, 16805, 17, 258j, 30l, 4b0, 962, a6, address, audi, code, fault, p0421, ross, tech, vag

vag-com code on my 02

PaJames on Feb 26, 2010

Mar 1, 2010 04:07 PM
by PaJames

7

6,561

any way to tell if it has piggie pipes?

ucf_motorcycle on Feb 15, 2010

Feb 16, 2010 04:44 AM
by SloopJohnB@mac.com

3

955

Need some advice on a sell vs. save decision

KneeDeep on Jan 6, 2010

Feb 13, 2010 12:45 PM
by 01A6Turbo

8

1,506

2000, 2004, 27t, a6, audi, code, ecu, extend, flash, o2, p0421, piggy, pipes, po431, s4, sensors, tsb

New to A6 2.7t Few questions

Johann2.7t on Feb 5, 2010

Feb 5, 2010 06:18 PM
by VONBOTTLE

3

1,554

17965, 2001, 2004, 2012357, 27, 27l, 4b0907551, a6, allroad, audi, catalytic, converter, p0421, p0431, tsb

Help with codes for 01 A6 2.7

tjscanlon on Dec 29, 2005

Jan 27, 2010 05:14 PM
by leeststorm

5

1,758