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Threads Tagged with p0421

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16805, 2002, 2003, 27, 30, a6, antifouler, audi, bank, bose, cat, catalytic, code, converters, p0421, price, put, quattro, v6

cat converter and bose questions

host23age on Nov 8, 2010

Mar 26, 2011 11:32 PM
by bigdadi

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4

3,894

a6, allroad, audi, autocheck, cat, cats, change, code, error, main, not, p0421, precats, ready, system

Check Engine Rediness Cycle for Pre Cat and Cat Codes

Jayr1000 on Feb 14, 2011

Feb 19, 2011 12:14 PM
by Jayr1000

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3

4,132

1423, 2001, 27, a6, allroad, audi, code, codes, fault, fix, p0421, p0431, p1411, p1423, p1423p1411p0421p0431p1128

00 a6 2.7t with codes p1423,p1411,p0431,p0421

audiLOVESwisco on Feb 18, 2011

Feb 19, 2011 12:11 PM
by audiLOVESwisco

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2

11,097

Computer & Fuel Systems

Question

2002, 30, a4, audi, avk, b6, cod, code, fwd, p0421, p421, passenger, po421, sensor, v6

P0421 on a 2002 3.0 V6 Fwd, what to do ?

ScGiants28 on Feb 9, 2011

Feb 9, 2011 11:49 PM
by ScGiants28

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2,412

2004, 30, a4, audi, catalytic, change, converter, location, o2, oxygen, p0421, p0431, sensor, size, thread

2004 Audi A4 3.0 O2 Sensor issues

Nicko on Apr 9, 2010

Dec 30, 2010 02:21 PM
by moiz

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7

15,000

03, 2002, 30, a3, a6, allroad, audi, codes, engine, hesitation, hestitation, low, missing, p0421, p0441, rpm, rpms, stutter

A6 hesitating at low RPM's, codes pulled

Frere Taz on Dec 20, 2010

Dec 21, 2010 11:57 AM
by Frere Taz

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4

2,715

0421, 42, anti, audi, car, cat, code, codes, fouler, mini, p0421, plug, search, spark, trick

OK got the 0421 Code. Options / suggestions?

urban_legend on Nov 29, 2010

Nov 30, 2010 05:53 PM
by bob martin

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4

1,675

0421, 0431, 42, a6, audi, cat, cel, ecu, fix, mil, mini, p0421, p0431, reset, work

Mil p0421, p0431

bigdadi on Oct 23, 2010

Oct 25, 2010 09:55 AM
by oldmots

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1

5,450

2002, 30, a6, audi, cel, clear, close, code, cost, fix, p0421, p0491, p0492, p0741, repair

CEL Codes P0741, P0421, P0491, P0492

drb321 on Sep 28, 2010

Sep 28, 2010 02:49 PM
by drb321

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6,428

2001, 28, 28l, a6, audi, catalyst, catalytic, code, converter, efficiency, false, fault, p0421, p0431, p0741, quattro

Experts jump in...

TheA6Pride on Jul 26, 2010

Jul 28, 2010 12:09 PM
by TheA6Pride

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2

1,940

2001, a6, audi, cat, catalyst, code, codes, diode, diose, o2, p0421, purpose, sensor, trick, warm

warm up catalyst code

Turbo123 on Jul 14, 2010

Jul 15, 2010 11:00 AM
by Turbo123

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2

1,787

16805, 17521, 2001, a4, a6, audi, b5, bank, check, code, codes, download, engine, fault, forum, light, p0421, s1, s4

Help with Fault Codes

Firefighter6484 on Dec 13, 2009

Jun 28, 2010 11:26 AM
by oldmots

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8

12,186

2001, 50, a6, audi, change, code, codes, diagnostic, miles, oil, p0156, p0421, po421, quatro, reset, service

P0156... sometime after P0421

alex jb on May 19, 2010

May 20, 2010 11:26 AM
by hxgaser

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2

3,296

a4, b6, bas, battery, check, empty, engine, gas, p0421, p0431

Check Engine due to fuel?

DanaB6 on Apr 29, 2010

May 2, 2010 01:02 AM
by Dan1969

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5

2,264

02, a4, a6, audi, cel, check, code, codes, engine, fixed, list, p0171, p0171b, p0174, p0421

CEL Codes - Self Correcting - P0171 P0174

drb321 on Apr 23, 2010

Apr 30, 2010 04:39 PM
by drb321

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3

25,518

Angry

2002, 30, a4, allroad, audi, b6, bank, block, blocked, cat, code, data, leak, misfire, p0421, quattro, vacuum

2002 3.0 Quattro questions

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Multi-page thread

1 2)

PaulA4 on Feb 27, 2010

Mar 9, 2010 02:42 PM
by PaulA4

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18

10,266

audi, code, p0421, purge, valve

So FRUSTRATED!!

falafel11 on Mar 4, 2010

Mar 4, 2010 01:54 PM
by falafel11

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0

796

a4, a6, audi, bad, bosch, bwd, catalyst, code, egt, p0421, po421, quattro, s4, sensor, warm, wires

Can the p0421 code really be connected to a vac. leak??

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Multi-page thread

1 2)

cacaro on Oct 20, 2009

Jan 8, 2010 03:34 PM
by cacaro

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18

4,723

S Car Model Line

02, 02audi, 30, a4, audi, audiforums, engine, forums, p0300, p0304, p0421, po421, problems, sale, v6

02 Audi A4 3.0 Quarttro for sale

707782y on Jan 2, 2010

Jan 4, 2010 02:57 AM
by 707782y

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1

1,546

Archive - Vehicles for Sale

audi, p0421, p0431, p1113, p1131

code check please

RoboRabbit on May 8, 2009

May 10, 2009 01:17 AM
by Midniteoyl

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2

1,030

S Car Model Line

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