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audi s5 2011 v8 4.2l, p0421, p0431, p0441, vapor canister valve

Another P0421 code... Audi S5 2011 V8 4.2L

Audi.S5.2011.V8 on Oct 12, 2022

Oct 12, 2022 05:49 PM
by Audi.S5.2011.V8

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0

1,570

03, 30, a6, audi, catalyst, code, ecu, error, p0421, p0431, po421, po431, software, update, warm

Warm Up Catalyst Efficiency P0421, P0431

Euge82 on Mar 15, 2013

Sep 16, 2014 10:10 AM
by ppgoal

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6

25,370

02, a6, audi, bank, catalyst, check, engine, fouler, gmc, p0421, sierra, threshhold, threshold, trick, warm, warmup

Warm-Up Catalyst Below Threshold (PO421/31)

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Multi-page thread

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Spotty on Feb 8, 2010

Mar 25, 2014 09:53 PM
by mcgregor32000

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17

62,082

04, 30, a4, a6, audi, bank, bars, base, carrier, cat, code, missan, murano, p0421, quattro

Code #P0421. Please help.

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Multi-page thread

1 2 3)

john@astigracing.com on Dec 23, 2009

Jan 14, 2014 09:10 AM
by cwilson

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24

22,740

a4, audi, b6, p0421, p0431, stop

P0421 & P0431 for years...

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Multi-page thread

1 2)

brewder on Aug 13, 2013

Nov 23, 2013 01:17 PM
by brewder

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10

22,160

0701, 2000, 2003, a4, a6, audi, code, fail, failsafe, intermittent, mode, p0421, p0431, safe, tiptronic, trans, transmission

Transmission/Tiptronic FAIL-SAFE or BACKUP MODES

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Multi-page thread

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soinclined on Aug 24, 2004

Aug 9, 2013 05:54 PM
by arielista

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31

52,587

audi, p0421, p1177

Vacuum Leak? codes p0306, p0421, p1177

nismo350z_burak_tx on Aug 6, 2013

Aug 7, 2013 09:54 AM
by twopedalwarrior

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1

2,514

0421, 2002, a4, audi, car, code, codes, fault, location, p0346, p0421, p0421p0431, p0431, p0741, pass

DTC codes P0421/P0431, needs new cats!

existence1000 on Apr 6, 2013

Apr 8, 2013 12:47 AM
by existence1000

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3

11,226

1999, 2000, 2001, a4, a6, audi, cel, code, cure, maf, p0421, p1127, p1129, replaced, s4

01 S4 - P0421, P1127, P1129 - Need Help!

titanko on Jun 22, 2010

Jan 25, 2013 08:45 AM
by titanko

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8

17,288

S Car Model Line

01, 0431, 2001, a4, aftermarket, allroad, audi, b5, code, exhaust, intake, leak, p0421, p0431, s4

P0431 and P0421

TheCounty on Dec 3, 2012

Dec 3, 2012 09:12 PM
by TheCounty

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0

11,322

2003, a4, audi, code, disappears, engine, light, p0421, reading

P0421....Take a look PLEASE!!!

2003audiA4avant on Jul 10, 2012

Jul 10, 2012 04:00 PM
by 2003audiA4avant

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1

4,858

02, 30, a4, audi, avk, b1, b2, b6, diy, location, oxygen, p0421, p0431, sensor, sensors

02 sensor location on 3.0

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Multi-page thread

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simsaudi3.0 on Feb 2, 2008

May 17, 2012 09:44 AM
by jlbpower

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13

54,294

2002, 30, a4, audi, bank, cat, check, code, dtc, engine, light, obd2, p0421, p0431, po421, quattro

2002 A4 3.0 Quattro DTC P0421/P0431

AnthonyVas79 on Mar 17, 2012

Apr 8, 2012 11:48 PM
by aquariumjunky

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2

8,465

Cool

2000, 27t, audi, b5, bank, code, eggs, internal, limp, misfire, missfire, mode, p0421, p1131, plug, resistance, rotten, s4, smells, spark

S4 2.7t p1131

tannercortes on Mar 30, 2012

Mar 30, 2012 09:54 PM
by tannercortes

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8

12,516

03, 2003, 2005, a4, audi, catalyst, catalytic, converter, cts, engine, esp, light, p0102, p0420, p0421, warm

Engine and ESP lights on (P0102, P0172, P0420, P0421)

romar1086 on Aug 29, 2011

Jan 3, 2012 06:51 PM
by 20090401

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1

6,614

02, a4, a6, audi, bank, catalyst, cel, code, denver, effeciancy, emission, error, p0421, po421, test

CEL: Code P0421

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Multi-page thread

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saintforlife on Jul 24, 2007

Oct 26, 2011 08:57 PM
by igortiger

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61

79,793

0304, 2001, 28, allroad, audi, b5, code, engine, p0304, p0421, quattro, s4, shift, shudder, tt

2001 Allroad shuddering p0304 code

Zeeborg on Jun 18, 2011

Jul 14, 2011 09:33 PM
by carbonhornet

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5

5,206

Allroad Model Line

a4, air, audi, code, fault, fuel, p0421, ratio, rich

need code advice PLEASE!

mr_A6 on May 31, 2011

Jun 1, 2011 08:35 AM
by padog

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2

1,281

2001, 27, 27t, a4, a6, audi, blocks, cat, clean, code, engine, measuring, p0421, po421, vag

help p0421 cat code what to do?

ratherb1 on May 3, 2011

May 3, 2011 11:31 AM
by ratherb1

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0

5,374

00, 0421, 1131, 2000, a4, audi, audib5s4p0421, b5, b5s4, b5s4p0421, code, diagnostic, means, p0421, po421, s4

'00 B5 S4 with P0421

the24thletter on Apr 16, 2011

Apr 16, 2011 02:08 PM
by the24thletter

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0

4,117

S Car Model Line

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