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Honda-Tech - Honda Forum Discussion
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Threads Tagged with
p0420
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Threads Tagged with
p0420
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Last Post
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Forum
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)
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)
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 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)
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)
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)
P0420 Code
jc007i
on Jan 20, 2012
Apr 11, 2017
08:35 PM
by
cjay__19
17
50,282
Honda Accord & Crosstour (2003 - 2012)
P0420 Catalyst system efficiency below threshold (bank1) o2 or cat?
(
1
2
)
Integra_Boi
on Feb 19, 2005
Apr 15, 2016
04:22 AM
by
RedTRex
48
479,335
Honda Accord (1990 - 2002)
'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)
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)
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)
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)
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)
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)
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)
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 Code P0420
trout63
on Mar 25, 2012
Mar 26, 2012
03:31 PM
by
Bad_dude
6
30,538
Honda Accord (1990 - 2002)
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)
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)
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)
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 Honda Civic P0420 code
jasrams
on Feb 6, 2012
Feb 8, 2012
05:22 AM
by
Allboost18b
8
7,265
Honda Civic (2001 - 2005)
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)
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
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
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
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)
'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)
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)
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