p0420 - Honda-Tech - Honda Forum Discussion

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1298, 2001, 97, acura, causing, cel, check, civic, code, codes, engine, failure, honda, idm, p0420, p1298, rsx, trouble

trouble code p1298 idm failure <----WHAT DOES THIS MEAN???

ziggy2000one on Jan 3, 2007

Jun 2, 2025 07:36 PM
by JTH1996-civic

9

15,467

Honda Civic / Del Sol (1992 - 2000)

1998, 2000, acura, check, civic, code, engine, error, fix, gsr, honda, light, p0420, po420, s2000

Code P0420 : Mechanic says:

seriot on Dec 6, 2007

Apr 29, 2025 09:23 AM
by JesseABN

22

82,080

Honda Civic / Del Sol (1992 - 2000)

1996, 1999, accord, check, civic, code, codes, engine, honda, light, odyssey, p0132, p0172, p0420, p1676, pretty, standard, trouble

Check Engine Light codes (CEL) Diagnostic Trouble Codes (DTC) Malfunction Indicator Light (MIL) and

(

1 2 3)

MuthaFodder on Jan 11, 2006

Mar 26, 2025 07:42 PM
by Darupupus

58

1,034,734

Honda Accord (1990 - 2002)

2000, 2001, 2002, acura, civic, code, crv, flow, honda, input, location, lx, o2, p0420, po420, sensor, speed, tl, turbine

2000 honda civic lx code p0420

tferro86 on May 11, 2008

Mar 13, 2025 08:48 AM
by HondaLXSoHC

9

29,231

Honda Civic / Del Sol (1992 - 2000)

0420, 1998, 2001, 420, 98, civic, code, eraased, honda, lx, obd, p0420, p420, po, po0420, po420

98 civic with p0420 code

chinox2001 on Jul 12, 2007

Dec 22, 2022 09:13 PM
by Mannyvtec805

2

11,258

Honda Civic / Del Sol (1992 - 2000)

0420, 1998, 2003, 99, accelerating, cat, cel, civic, code, converter, honda, hondatech, mdx, p0420, stumbling, tsb

99 Civic EX - P0420 Code

older_honda on Jun 11, 2009

Jul 10, 2018 06:34 PM
by Ceabiskett

12

23,181

Honda Civic / Del Sol (1992 - 2000)

2003, accord, bad, cat, code, crv, driving, honda, hondatech, o2, p0420, po420, post, reading, sensor, thermostat, voltage

P0420 Code

jc007i on Jan 20, 2012

Apr 11, 2017 08:35 PM
by cjay__19

17

50,282

Honda Accord & Crosstour (2003 - 2012)

1, 2003, accord, bank, catalyst, code, effeciency, efficiency, honda, honea, p0420, po420, system, sytstem, threshold

P0420 Catalyst system efficiency below threshold (bank1) o2 or cat?

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1 2)

Integra_Boi on Feb 19, 2005

Apr 15, 2016 04:22 AM
by RedTRex

48

479,335

Honda Accord (1990 - 2002)

04, 07012004, 2004, 2006, accord, code, crv, dtc, engine, honda, light, p0420, software, tsb, update

'04 Accord, DTC p0420, on....off

adorek24 on Mar 26, 2010

Dec 19, 2014 01:35 PM
by DaddyMack2698

7

21,977

Honda Accord & Crosstour (2003 - 2012)

03, 99, cel, civic, crack, cracked, cvic, d16y7, exhaust, header, honda, icm, idle, manifold, p0420, rough

99 Civic d16y7 - cracked header, misfiring, and throwing CEL code P0420

720kev on Nov 22, 2010

Nov 29, 2014 07:09 PM
by normanl2491

9

7,875

Honda Civic / Del Sol (1992 - 2000)

040, 0420, 2000, assembly, cap, catalytic, civic, code, converter, distributer, distributor, error, honda, installing, p0420, replace, replaced

Error code P0420 after install distributor cap assembly

frk040 on Jan 9, 2011

Jun 8, 2014 06:32 AM
by Former User

5

9,739

Honda Civic / Del Sol (1992 - 2000)

2002, 98, accord, additives, catalytic, check, converter, cost, due, honda, obdii, p0420, pass, problems, smog, warranty

Write up - Dealer replaced catalytic converter 98 Accord OBD2 P0420...finally for free.

arielb1 on Nov 29, 2004

Apr 15, 2014 10:02 PM
by MAD_MIKE

10

15,747

Honda Accord (1990 - 2002)

03, 0420, 1996, 2002, 24, accord, acord, code, gide, honda, lx, p0420, p420, po420, troubleshooting

Troubleshooting P0420 Code...

dlewis2583 on Jan 3, 2012

Aug 14, 2013 01:16 AM
by Discosteak

11

21,634

Honda Accord (1990 - 2002)

P0420, P1164, P1167

Accord(ing)2me on Jan 18, 2012

Jul 11, 2012 11:10 AM
by jdmcertified909

9

13,957

Honda Accord (1990 - 2002)

cat, check, civic, dont, fouler, honda, hondatech, locations, nuys, p0420, pass, pay, plug, smog, spark, test, van

The much dreaded P0420 :(

(

1 2)

Weewee on May 4, 2012

Jun 13, 2012 08:57 AM
by portenio78

29

35,390

Honda Civic / Del Sol (1992 - 2000)

civic, computer, honda, p0420, ping, powered, rdx, vbulletin

P0420 code after I replaced exhaust manifold and cat

zackn8 on May 21, 2012

Jun 7, 2012 03:53 PM
by zackn8

15

12,059

Honda Civic / Del Sol (1992 - 2000)

98, accord, code, fault, honda, obd, odb2, p0302, p0420, p1456

New Owner needs some help with diagnosing codes (98, 4cyl,5spd)

ajerman on Apr 13, 2012

Apr 24, 2012 08:31 AM
by ajerman

10

2,634

Honda Accord (1990 - 2002)

99, accord, catalyst, check, code, cyl, efficiency, engine, honda, hondatech, light, p0420, system, threshold, turns

99 Accord Code P0420

trout63 on Mar 25, 2012

Mar 26, 2012 03:31 PM
by Bad_dude

6

30,538

Honda Accord (1990 - 2002)

01, 2001, 2002, accord, code, codes, fault, google, honda, odyssey, p0420, trouble

P0420 Trouble Code

Accord(ing)2me on Mar 9, 2012

Mar 9, 2012 09:40 AM
by GhostAccord

1

4,478

Honda Accord (1990 - 2002)

2000, cat, civic, code, cross, crossp0420, exhaust, honda, leak, leaking, manifold, number, o2, oem, oxygen, p0420, sensor, threads

CAT Conv., Pre & Post O2 Sensors ('98 Civic)

ejulson on May 2, 2011

Mar 5, 2012 06:52 AM
by jaconlon1

5

3,729

Honda Civic / Del Sol (1992 - 2000)

2000, acura, burning, cat, code, defouler, honda, integra, oil, p0420, po420, replaced, replacement, rl, s2000, trick

P0420 coming on after cat replacement

ccrelan on Mar 3, 2012

Mar 3, 2012 05:36 PM
by ccrelan

11

8,123

Honda Civic / Del Sol (1992 - 2000)

02, bad, cat, cel, civic, defouler, ep3, gas, honda, mileage, p0420, po420, poor, replaced, replacing

Replacing Cat in Cali + CEL P0420

Dangydang on Feb 12, 2012

Feb 17, 2012 06:03 PM
by b_ron

5

2,731

Acura RSX DC5 & Honda Civic EP3

02, 90, 96, accord, anti, civic, code, degree, dx, fouler, honda, p0420, plug, po420, spark

02 Honda Civic P0420 code

jasrams on Feb 6, 2012

Feb 8, 2012 05:22 AM
by Allboost18b

8

7,265

Honda Civic (2001 - 2005)

2000, 2005, bad, censor, civic, code, crv, ep3, honda, o2, p0420, po420, replace, sensor, tech, upstream

02 Honda Civic P0420 code

javiertololo on Jan 5, 2012

Jan 10, 2012 03:26 AM
by It Wasn't Me

7

57,243

Honda Civic (2001 - 2005)

03, 2008, cat, civic, code, honda, o2, p0420, p1167, pilot, plugs, po420, sensors, si, spark

P0420, P1166 and P1167 after new cat, new plugs, new O2,

troybmm on Dec 3, 2011

Dec 6, 2011 05:36 AM
by Type-Spaz

17

9,423

Acura RSX DC5 & Honda Civic EP3

0420, 06, 2006, catalytic, code, converter, honda, hondapilotbank1converterreplace, hondapilotcodes, odyssey, p0420, p0420hondapilot, pilot, po420, rearwutwc

Honda Pilot MIL on with P0420 code help

tshelton38 on Nov 5, 2011

Nov 5, 2011 10:34 PM
by tshelton38

2

64,302

Honda Minivans, Crossovers, and Trucks

, 03, accord, acura, cel, civic, code, ep3, honda, mdx, p0420, po420, rl, rsx, tl

So just threw a P0420 code

02blackhatch on Oct 28, 2011

Oct 31, 2011 04:04 AM
by rjmq06

2

7,603

Acura RSX DC5 & Honda Civic EP3

1509, 2000, 97, automatic, civic, code, crv, dx, honda, p0420, p1509, start, tech, time

2000 dx , p1509 start then die.

92DAIntegraXSI on Sep 28, 2011

Sep 28, 2011 11:43 AM
by Former User

1

4,810

Honda Civic / Del Sol (1992 - 2000)

06, 2002, 96, 98, accord, acord, cel, code, codes, honda, p0420, p420, po0420, po420, reset

'98 Accord with P0420 code, please help...

travelin' man on Aug 24, 2011

Aug 24, 2011 06:49 AM
by travelin' man

0

4,083

Honda Accord (1990 - 2002)

2000, 420, 97, civic, civil, cx, dies, gas, honda, p0420, po, po420, power, press, start

po420 and no power, it dies out

admess188 on Nov 23, 2010

Aug 13, 2011 07:29 PM
by justinsbg

9

2,338

Honda Civic / Del Sol (1992 - 2000)

Threads Tagged with p0420