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

Warm Up Catalyst Efficiency P0421, P0431

Euge82 on 03-15-2013

09-16-2014 10:10 AM
by ppgoal

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6

24,773

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 03-17-2012

04-08-2012 11:48 PM
by aquariumjunky

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2

8,240

audi, cat, catalyst, catalytic, check, code, converter, efficiency, engine, light, p0241, po421, replaced, threshold, warm

P0241: Warm Up Catalyst Efficiency Below Threshold

mogwai88 on 03-31-2012

03-31-2012 12:09 PM
by bigdadi

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1

11,051

2001, 421, a4, a6, audi, bad, cat, code, doe, fix, fixing, p0431, po421, po431, reflash, s4

How to fix the problem coming up with the code P0431

sixcoco on 01-25-2012

02-13-2012 02:51 PM
by Rolling Blackout

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8

12,726

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

1 2 3 ... Last Page)

saintforlife on 07-24-2007

10-26-2011 08:57 PM
by igortiger

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61

77,814

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

help p0421 cat code what to do?

ratherb1 on 05-03-2011

05-03-2011 11:31 AM
by ratherb1

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0

5,261

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

'00 B5 S4 with P0421

the24thletter on 04-16-2011

04-16-2011 02:08 PM
by the24thletter

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0

3,992

S Car Model Line

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 02-09-2011

02-09-2011 11:49 PM
by ScGiants28

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0

2,206

2002, 241, 30, a4, allroad, audi, bank, catalytic, code, converter, engine, p0241, po, po241, po421

PO241 Diagnostic Code

psanta on 07-22-2010

08-05-2010 05:31 PM
by psanta

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2

4,177

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

P0156... sometime after P0421

alex jb on 05-19-2010

05-20-2010 11:26 AM
by hxgaser

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2

3,156

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 10-20-2009

01-08-2010 03:34 PM
by cacaro

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18

4,383

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 01-02-2010

01-04-2010 02:57 AM
by 707782y

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1

1,454

Archive - Vehicles for Sale

2002a6, 30, audi, catalyst, code, p0421001, po421, replacement, warm

Oxygen (02) Senor replacement - preferred brand?

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Multi-page thread

1 2)

j_dinan on 07-27-2009

07-28-2009 12:50 AM
by hxgaser

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12

1,977

2000, booster, check, code, engine, fuel, light, lucas, octane, outback, p0421, po421, po741, rid, subaru

check engine light from fuel sys cleaner ??

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Multi-page thread

1 2 3)

graybno on 01-31-2009

02-12-2009 08:41 AM
by padog

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29

7,749

2002, 2003, 2004, 30, a4, a6, audi, cats, chevrolet, error, error1, estereo, p0421, po421, side

P0421 error 1 Cat or 2?

Madtown on 09-03-2008

01-14-2009 09:00 PM
by 5th_year_senior

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2

1,485

02, 2002, a4, a6, audi, audia, code, codes, dtc, fault, location, p0431, po421, po431, quattro

fault codes po421 and po431

simsaudi3.0 on 02-02-2008

03-12-2008 11:37 PM
by tj19855

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7

8,930

2000, 421, 431, a4, allroad, audi, code, codes, fault, po, po421, po431, reflash

MOVED: fault codes po421 and po431

simsaudi3.0 on 02-06-2008

02-06-2008 09:57 PM
by simsaudi3.0

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0

1,861

2000, 2001, a6, audi, catalytic, code, codes, cold, converter, o2, p0421, po421, s4, sensor, start, trouble

Code p0421

typhoonfd on 11-23-2007

11-23-2007 10:00 AM
by typhoonfd

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4

1,852

S Car Model Line

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