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Threads Tagged with p0421

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032, 2001, 2008, 27t, a3, audi, engine, forums, misfire, misfires, misfiring, p0300, p0421, random, rs4, s4

still misfires, now random

DSMKiller on 05-02-2009

05-03-2009 01:27 PM
by bottlecap

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7

984

S Car Model Line

Post

02, a6, audi, bdu, catalytic, code, codes, converter, error, kod, obd, obd2, p0421, p0421p0431, p0431, quattro

Error Code P0431

twinturbosixer on 04-15-2009

04-15-2009 11:25 AM
by hxgaser

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1

5,090

2000, 2004, 27, 27t, a6, audi, cat, catalytic, converter, cost, main, p0421, precat, replace, replacement, replacing

Catalytic converter question 2000 A6 2.7T

jgurland on 12-14-2007

02-23-2009 05:51 PM
by eek

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5

7,521

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

7,735

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, 2001, 28, 30, a6, audi, diagnostic, fouler, ox, p0421, p0431, quattro, srnsor, trouble

New ride, and a few problems...

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Multi-page thread

1 2 3)

crazyguy on 12-14-2008

12-17-2008 08:50 AM
by crazyguy

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28

3,666

2003, a4, audi, b6, dtc, ii, obd, obdii, p0421

P0421

snr1951 on 05-07-2008

05-08-2008 12:42 PM
by auditurbo381

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2

1,133

2002, a4, a6, audi, b6, car, cat, code, codes, conv, drive, faulty, p0421, p0431, update, vag

P0431, P0421 codes, help!!

monkey323i on 04-27-2008

04-28-2008 11:05 PM
by AudiTech616

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1

3,203

2002, a4, a6, audi, bank1, catalyst, catalytic, code, convereters, efficiency, p0421, p0431, p1557, threshold, warm

PLease Help 2 Catalytic Converters bad, codes P0421, P0431, P1557, P1127

bslags on 03-27-2008

03-27-2008 11:23 AM
by bslags

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0

2,663

Intake, Headers and Exhaust

1606, a6, audi, bank, code, gear, high, low, oil, p0421, p0741, p1113, p1131, p1423, reflash, resistance, sensor, tt

Lots of codes, but few symptoms...help?

jgurland on 01-28-2008

01-29-2008 08:51 PM
by jgurland

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4

1,726

37, a4, a6, audi, bank, brakes, catalyst, code, epc, light, p0421, q7, sensors, trouble, warm, warning, wear

Code P0421 PLEASE READ

COJAM on 11-20-2007

11-24-2007 08:14 PM
by COJAM

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9

6,637

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

2000, 27, 27t, a4, a6, a8, allroad, audi, bank, catalyst, code, efficiency, fix, p0421, p1423, quatro, threshold, warm

Got an 2000 A6 2.7t w/ p1423 & P0421

chromatin on 10-30-2007

10-30-2007 08:49 PM
by JCMAC

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1

3,599

2003, 30, 30l, a4, a6, audi, code, codes, coils, ignition, p0300, p0304, p0421, p0431, quattro, replacement

2003 A4 3.0L Quattro, codes P0421 and P0431, now also P0300, P0301, P0303 & P0304

rerodriguez11 on 10-16-2007

10-16-2007 04:40 PM
by techbod

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4

11,588

03, 2002, 2003, 30, 30l, a4, a6, audi, code, codes, engine, fix, p0421, p0431, service

2003 A4 3.0L Quattro, codes P0421 and P0431

rerodriguez11 on 10-04-2007

10-06-2007 02:38 PM
by rerodriguez11

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1

4,574

, 6, a4, a6, a8l, audi, code, codep0421, codes, esp, fault, fix, gas, p0421, p0431, reset

CODE P0421 and P0431

jlewis166 on 09-07-2007

09-08-2007 09:06 AM
by jlewis166

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4

4,724

audi, b5, check, engine, leak, limp, p0421, p0431, p1131, reprogram, s4, small, vacum, vag, vagcom

2002 s4 b5.. need help

Spyroot on 12-22-2006

12-26-2006 07:55 PM
by Baskin 4.2l

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6

3,232

S Car Model Line

27t, a6, audi, bari7230, check, engine, light, p0421, p1411, p1423

2000 2.7T

bari7230 on 10-23-2006

10-23-2006 06:32 PM
by bari7230

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0

1,485

2000, audi, bank, cam, causing, cleaning, combi, dumping, fuel, p0421, p1127, p1136, position, rich, sensor, shaft, trim, tt, valve

She is fixed!!!!!! UPDATE: Multiple error codes...pelase help

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Multi-page thread

1 2)

matt1colorado on 08-03-2006

08-21-2006 11:12 PM
by matt1colorado

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17

12,742

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