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Threads Tagged with p0421

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01, 1999, 626, check, code, codes, engine, mazda, miata, p0300, p0421, po300, protege, protoge, tribute

Check Engine Code _ P0300 & P0421

jackgl on Oct 7, 2009

Oct 8, 2009 05:25 AM
by hixx

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1

6,181

2001, back, code, data, diagnostic, engine, guyscom, heater, mazda, miata, o2, p0421, pressure, protege, wwwmazda

Help Mazda guys !!!!P0421

Martyvr6 on Oct 6, 2009

Oct 6, 2009 05:34 PM
by Martyvr6

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0

2,798

99, code, computer, fouler, miata, mpv, nonfouler, oxygen, p0421, p0431, pass, plug, precat, removel, rigged, sensor, spark, trick

2 Attachment(s)

Dirty Tricks & Cats

NightSwimmer on Jun 13, 2009

Jul 10, 2009 07:45 PM
by Master P

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3

5,492

2000, 2001, 2003, catalyst, code, codes, efficiency, error, fix, mazda, mpv, p0421, protege, rx8, threshold, trouble

2000 MPV Trouble code P0421

thelordparadox on Jun 20, 2009

Jun 20, 2009 04:58 PM
by NightSwimmer

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1

11,242

code, mazda, miata, mpv, p0421, po421

MPV with P0421 code

NightSwimmer on Mar 18, 2009

Mar 18, 2009 06:42 PM
by NightSwimmer

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0

3,719

02, 99, bank, interval, located, location, mazda, miata, millenia, mpv, o2, oxygen, p0421, sensor, sensors

99 Millenia S Engine Light Again!!!

99millenia on Mar 15, 2009

Mar 15, 2009 07:02 PM
by keninn

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1

2,538

Post

0300p0421p0431, 2000, code, condition, converter, expensive, fix, hotwire, lean, mazda, millenia, odb, p0421, p0431, problem, reader

2000 Millenia S Runs fine, then won't ... codes P0421, P0431 Tuition is expensive!

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1 2)

2000MysteriousS on Feb 10, 2009

Mar 10, 2009 07:35 AM
by keninn

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15

12,577

code, codes, egr, error, mazda, p0421, protege, protege5, remove

Protege5 error code

lkirsch on Nov 21, 2008

Nov 22, 2008 04:34 AM
by virgin1

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1

1,838

1996, 626, cat, code, dtc, failed, inspection, mazda, nj, not, obd2, obdii, p0421, protege, supported, temp

OBDII P0421 Failed Inspection Please Help!!!

scifi08 on Oct 10, 2008

Oct 21, 2008 12:58 AM
by 80sGuy

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2

5,078

1, 2001, bank, catalyst, code, efficiency, mazda, millenia, mpv, p0421, p0431, p0481, threshold, warm, warmup

P0421,P0431,P0481

dkennedy on May 30, 2008

Jun 29, 2008 06:09 PM
by woodurb69

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1

7,485

2001, 25l, catalytic, code, codes, converter, mazda, mellenia, miata, millenia, obd2, p0421, part, po421, precat, trouble

trouble code P0421

maddflavor on May 6, 2008

May 22, 2008 04:51 PM
by piggylover1985

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5

16,658

20, 2001, blinking, cel, code, codes, es, flashing, mazda, misfire, p0300, p0421, po300, po421, protege, random

Flashing CEL - P0300 & P0421 - 2001 2.0 ES

adrockin on Apr 9, 2008

Apr 10, 2008 08:26 AM
by nelsonjere

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1

4,832

0421, 323, auto, b6gd20500c, ca, catalytic, code, converter, emissions, forum, mazda, number, p0421, part, protege

'98 Protege - CEL, P0421 Code

robinsmw on Jul 17, 2006

Apr 6, 2008 12:10 PM
by nitehawk92

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5

13,780

1998, 626, 98, bad, cat, check, code, engine, mazda, o2, p0421, po421, post, pre, protege, symptoms

98 Protege P0421 Check engine light

brown_devil on Jan 16, 2008

Mar 1, 2008 09:12 PM
by JAXCANE

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3

5,900

2007, bad, cat, dtc, hesitation, mazda, mil, mpv, o2, p0421, protege, sensor, shooting, tribute, trouble, troubleshoot, troubleshooting

Need Troubleshooting Help

TIonLI on Sep 24, 2007

Dec 28, 2007 08:42 AM
by gcoron

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5

3,159

02, 1998, 98, bringing, catalyst, ecl, light, mazda, p0421, prodage, protege, protegep0421, protegewhat, sensor, warm

98 Protege problem with ECL P0421

prot2 on Sep 22, 2007

Dec 2, 2007 08:49 AM
by MazdaES

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8

3,856

catalytic, check, code, converter, dealer, diagnosis, engine, light, mazda, milennia, p0170, p0421, p1526, price, protege, repair

Check Engine light on (again) 3 codes - P1526, P0170, P0421

lacawi on Nov 20, 2007

Nov 20, 2007 08:32 PM
by lacawi

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2

6,716

gas, mazda, out, p0421

01 LX 2.0 headache

sandeeeg on Nov 5, 2007

Nov 9, 2007 11:01 AM
by sandeeeg

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4

1,440

16110, 2001, bank, cat, catalyst, catalytic, converter, eff, mazda, p0421, protege, threshold, walker, warm, warmup

Warm Up Catalyst Efficiency Below Threshold (Bank 1)

Shutterbug on Oct 17, 2007

Oct 19, 2007 08:30 PM
by MazdaES

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3

17,816

2001, cap, code, codes, diagnosis, diagnostic, gas, madza, mazda, mpv, p0421, p0481, po421, protege, reset

2001 mpv p0421 and p0481 codes

lane stradler on Sep 20, 2007

Sep 22, 2007 05:39 PM
by hixx

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5

11,115

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