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Threads Tagged with p0421

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1997, 20, 2000, 626, california, code, control, emision, error, mazda, mpv, oxygen, p0421, p0421mazda, sensor

Error code P0421

jroberts 312 on Jan 25, 2006

Dec 11, 2024 03:33 PM
by Callisto

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4

16,427

Mazda 323,Mazda 626 & Mazda 929

323, p0421

Mazda 323 P0421

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Multi-page thread

1 2 3)

azexian on Mar 8, 2016

Mar 23, 2016 10:51 PM
by Sparky202

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20

7,119

Mazda 323,Mazda 626 & Mazda 929

cataclean, clear, fails, mazda, misfire, p0421, protege

00 Protege - Misfire? No code?

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Multi-page thread

1 2)

N628PW on Jan 25, 2014

Feb 13, 2014 07:32 AM
by UseYourNoggin

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10

17,688

02, bank, exhaust, fuel, locations, manifold, mazda, millenia, negative, oxygen, p0421, p0431, replacing, sensor, short, term, trim, video

1 Attachment(s)

Help with P0421, P0431 codes, '02 milly s

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Multi-page thread

1 2 3)

LuckyJack on Nov 30, 2013

Jan 1, 2014 08:41 AM
by Juanky

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20

19,168

03, code, dies, mazda, mazdaspeed, p0090, p0421, prc, protege, protege5, random, solenoid

CEL problems...

kasruesao on Dec 3, 2013

Dec 3, 2013 07:13 PM
by UseYourNoggin

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4

5,178

0421, 1195, code, finecel, mazada, mazda, miata, millenia, obd, obd2, obdii, p0421, p1195, protege, runs, wwwobdcodescomp0421

OBD codes P1195 & P0421

erikaroe on Jul 7, 2010

May 19, 2013 08:42 AM
by UseYourNoggin

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2

8,087

Exclamation

2006, 2010, 25, 67000, bank, change, check, engine, kbb, light, mazada, mazda, mazda6i, p0421, plugs, spark

2010 Mazda 6 67000 Miles Check Engine Light Help Misfire issues

mazda6pittsburg on Jan 26, 2013

Mar 5, 2013 08:13 AM
by UseYourNoggin

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5

9,016

5, cat, mazda, mazda5, p0421

Is it hard to replace the cat on my 2007 mazda 5!!

turbo3000 on Nov 10, 2012

Nov 10, 2012 08:12 AM
by turbo3000

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0

1,685

323, ca, code, mazda, p0421, pass, report, smog

Help passing CA SMOG!

david.fhs on Jul 28, 2011

Nov 11, 2011 12:59 PM
by Robdog

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1

3,020

Mazda 323,Mazda 626 & Mazda 929

02, 04, 98, code, mazda, oxygen, p0421, p0421code, pcm, po421, protege, received, replace, sensor, upstream

98 Proteger P0421 code

brown_devil on Oct 24, 2011

Oct 26, 2011 08:35 PM
by tanprotege

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1

3,269

0100301, bank, bulletin, bulleton, cat, item, mazda, mazda3, millenia, number, p0421, po421, service, technical, tsb

P0421!?!?!?!?!?!

santa6 on May 24, 2011

May 25, 2011 01:26 PM
by keninn

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5

5,055

case, egr, exhaust, leak, mazda, p0421, protege, valve, youtube

Egr

ntstock93 on Apr 15, 2011

Apr 29, 2011 08:34 PM
by Big Money

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4

2,601

1998, 98, autoxray, check, code, codes, dx, engine, forum, mazda, p0421, p0505, p1195, protege, troble, trouble

1998 Mazda Protege Trouble code help?

doug2060 on Jan 31, 2011

Feb 1, 2011 06:15 PM
by darkstar4100

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1

5,168

1998, 2000, 50, 98, code, computer, diagnostic, fix, mazda, miles, p0400, p0421, p1195, protege, resetting, troubleshoot

P0421 & P0400 98 LX 5speed protege

flystarrain on Jan 9, 2011

Jan 9, 2011 03:53 PM
by flystarrain

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0

3,454

01, 2000, 626, bank, catalytic, codes, converter, mazda, mpv, p0421, plugs, po421, recently, replaced, spark

P0421

brian21740 on Nov 5, 2010

Nov 26, 2010 04:53 PM
by dasilvarenegade

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1

6,196

Mazda 323,Mazda 626 & Mazda 929

1999, cat, catalytic, converter, fix, mazda, miata, neko11, p0421, pre, precat, protege, sensor, twc, wutwc

P0421 and not changing the WU-TWC (or precat)

neko11 on Nov 15, 2010

Nov 15, 2010 10:48 AM
by neko11

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0

8,696

1996, 2000, 626, code, codes, diagnostic, forum, forums, mazda, mazda6p0421, miata, millenia, mpv, p0421, repair

Fault Code P0421

jwelsh86 on Mar 16, 2010

Mar 30, 2010 12:44 PM
by zr1mark

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1

5,063

Mazda 323,Mazda 626 & Mazda 929

0421, 17, 2007, 323, check, code, codes, engine, fault, faultcode, fly, mazda, p0421, pending, protege, setting

Fault Code P0421

jwelsh86 on Mar 16, 2010

Mar 24, 2010 09:06 PM
by jwelsh86

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5

14,612

2002, 626, code, madza, mazada, mazda, miata, millenia, millina, p0300, p0421, po300, po421, protege, reads

p0300 and p0421

drac2000 on Feb 24, 2010

Mar 2, 2010 12:29 AM
by cogaivotchong

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1

5,213

Exclamation

2000, 2001, 99, computor, fix, gas, inside, mazda, mazda6, millenia, oil, p0421, problems, protege, smell

Catalyst and Gasoline Smell- Mazda Millenia S '99

millenia s on Jan 23, 2010

Jan 24, 2010 03:10 PM
by millenia s

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3

6,018

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