Threads Tagged with p0420

0430, 1996, bad, bank, c5, c6, cat, chevy, code, codes, corvette, p0420, p0430, twc, vette, z06

'vettes throwing a code: P0420

And7Baller on May 1, 2009

Feb 25, 2020 10:09 AM
by jjc508520

14

17,316

C6 Forced Induction/Nitrous

0420, 0430, 1996, 2005, c5, cel, code, codes, corvette, edelbrock, p0420, p0430, po420, supercharger, zo6

code help P0420,P0430

realcanuk on Jul 24, 2011

Mar 18, 2016 09:50 AM
by Dude_man

17

12,955

2006, bulletin, c6, cel, code, corvette, gm, p0420, po420, service, z06

2006 C6 CEL Code P0420

TheMachine on Apr 25, 2012

Apr 25, 2012 11:41 PM
by TheMachine

4

4,423

99, c6, cat, corvette, forum, header, headers, hiflow, installing, kooks, ls2, muffler, p0420, po420, straight

just Installed "KOOKS" Headers Today

(

1 2)

jpee on Oct 7, 2011

Oct 10, 2011 09:08 AM
by SuperchargedStroker

23

2,539

c6, code, codes, corvette, engine, forum, p0420, p0430, p2a01

Help with Engine codes

vic82 on Jul 31, 2011

Aug 2, 2011 05:05 PM
by Thule

2

1,050

C6 Scan & Tune

c5, catalyst, code, corvette, diagnostic, dtc, efficiency, forum, low, p0420, system, trouble

Engine light is on with a DTC code or P0420

dmmercer on Feb 22, 2011

May 10, 2011 07:35 PM
by BRISLS1

3

1,345

1996, bank, bank1, catalyst, chevy, corvette, efficiency, exhaust, lt1, normal, p0420, performance, system, threshhold, threshold

Catalyst System Efficiency Below Threshold (Bank 1)

dogfish246 on Mar 19, 2011

Mar 20, 2011 12:16 PM
by 96GS#007

3

2,557

P0420/p0430

SSGT's99vette on Feb 4, 2011

Feb 8, 2011 08:10 AM
by SSGT's99vette

6

2,483

0430, 1996, 2005, c6, car, catalyst, cats, clog, code, corvette, forced, induction, p0420, p0430, po420

Have O2 codes P0420 & P0430 need help!!

1badzo6 on Jul 13, 2010

Dec 14, 2010 09:58 PM
by Joe_G

9

3,634

P0420 code

papafrancisco on Dec 7, 2010

Dec 7, 2010 07:44 PM
by papafrancisco

0

681

C4 General Discussion

blinking, c5, cel, code, control, corvette, flashing, lamp, mil, p0101, p0131, p0300, p0420, po300, traction

P0300 code and flashing CEL

Aerovette on Oct 4, 2010

Oct 4, 2010 03:23 PM
by dougbfresh

4

3,684

C6 Corvette General Discussion

biddaddiesgarage, bigdaddiesgarage, cat, catless, cel, corvette, dirty, fix, mini, o2, p0420, p2096, reviews, riding, sensor, work

Riding dirty with the CEL

jsims002 on Sep 20, 2010

Sep 20, 2010 11:50 AM
by jsims002

3

1,005

0430, 2004, 2008, c5, c6, code, corvette, efficiency, engine, forum, p0420, p0430, p0430catalyst, system, z06

P0430 Catalyst System Low Efficiency Bank 2 Code Back

Vette Nut on Aug 4, 2010

Aug 12, 2010 01:12 PM
by h8bumps

9

11,889

2007, c5, c6, c6z06, calibration, catalist, code, codes, corvette, dtc, p0420, p0430, po420, z06, zo6

[Z06]

P0420 Code

SziTech on Jun 23, 2010

Jun 25, 2010 07:18 PM
by old.hot.rodder

8

9,777

2000, 2008, actron, c5, c6, check, chevy, code, corvette, engine, issues, light, obd2, p0420, po430

[Z06]

My Check Engine Light is on - Code P0420

C6DuffMan on Jun 18, 2010

Jun 18, 2010 06:57 PM
by 90sundevil

6

5,120

10, catalyst, control, dtcfrzf, efficiency, frame, freeze, j1850, mod, mod10, module, p0420, pwm, sae, threshold

P0420 & Freeze Frame

sbontrag@hotmail.com on May 13, 2010

May 24, 2010 02:42 PM
by sbontrag@hotmail.com

10

3,238

P0303

Fujikura on Apr 13, 2010

Apr 20, 2010 07:33 PM
by Y2Kvert4me

14

3,263

10, c5, code, corvette, hc, p0420, pcm, rdcm, u1064h

[Z06]

Code Help Needed

slong on Mar 27, 2010

Mar 28, 2010 01:17 PM
by slvrzo6

4

713

back, c6, cats, code, corvette, lazenby, mike, nederland, p0420, p0430, performance, tech2, texas, tko, z06

Code po420

MIKE LAZENBY on Feb 27, 2010

Feb 27, 2010 10:05 PM
by martysauto

4

2,038

C6 Scan & Tune

1996, 84, c3, c5, check, code, corvette, cyclinder, cylinder, engine, light, misfire, order, p0420, z06

[Z06]

P0420 and misfire in cylinder 4 check engine light

drewcorvette on Jan 16, 2010

Jan 16, 2010 05:56 PM
by drewcorvette

0

1,085

1999, 99, c5, cags, check, code, codes, corvette, engine, mountain, p0420, po420, po430, reprogram, z06

[Z06]

MIL Lamp - P0420 (dealer wants to swap cat)

mr.radon on Nov 16, 2009

Dec 9, 2009 11:41 PM
by 383vett

15

4,104

0c, c6, code, corvette, e10, error, gasoline, id, mod10, nmsc, p0171, p0174, p0420, test, yahoo

MIL On Assistance, ID 60 Fail

sbontrag@hotmail.com on Nov 24, 2009

Nov 26, 2009 12:11 PM
by sbontrag@hotmail.com

2

2,190

96, bank, c5, camaro, codecataletic, converter, corvette, efficency, low, misfire, o2, oxygen, p0420, replace, sensors

P0420 Low Efficiency Bank 1

dogfish246 on Nov 23, 2009

Nov 26, 2009 06:57 AM
by corvette95

9

3,104

catalyst, catalytic, converter, htd, na, p0420

P0420-Catalytic Converter-HELP Please

sbontrag@hotmail.com on Oct 27, 2009

Nov 8, 2009 05:40 PM
by sbontrag@hotmail.com

10

1,056

07, 2008, c6, car, code, eliminator, eliminators, emission, emmsions, evaporation, ga, mil, mustang, p0420, p0430, pass, reporting, test, wont

Must pass emissions! Please help!

nitrod86gt on Sep 21, 2009

Oct 9, 2009 09:07 AM
by Ron@Vengeance Racing

17

9,359

C6 Scan & Tune

2000, 2004, 2006, 84, bank, c5, catalyst, check, corvette, efficiency, engine, light, p0420, service, threshold

Check engine light on???

FRED HAMBLE on Sep 2, 2009

Sep 3, 2009 07:50 PM
by FRED HAMBLE

2

943

15, 1995, camaro, catalytic, converter, grand, harness, obd, p0420, pcm, pontiac, reading, wire

Wiring harness help needed

b16gsr on Sep 7, 2008

Aug 6, 2009 05:26 PM
by kcrick

10

688

C4 General Discussion

P0420 "Catalyst System Efficiency Below

vettezeke on Jul 25, 2009

Jul 26, 2009 09:37 AM
by Chevy Guy

4

938

200, c5, code, communications, corvette, fix, loss, p0420, p0430, po1571, tcs, u1016, u1040, u1064, u1096, volk

c5 went crazy

gorghamak on May 31, 2009

Jun 7, 2009 07:26 AM
by gorghamak

12

1,419

2004, c5, c6, catalytic, code, corsa, corvette, defective, p0420, tsb, z06, zo6

[Z06]

Check engine light code P0420? ? for people that had TB performed

lemans on Jun 1, 2009

Jun 6, 2009 01:56 PM
by speeding bullet

18

1,337

1, 1a, 96, bank, c5, code, codes, corvette, efficeny, efficiency, low, p0420, system, twc, wtc

P0420 TWC System Low Efficiency Bank 1

AQWIKZ on Mar 14, 2009

Mar 14, 2009 11:16 AM
by AQWIKZ

2

4,396

02, c5, corvette, harness, headers, kook, kooks, o2, offroad, p0420, pipe, problem, problems, sensor, sensors

kooks long tubes O2 sensors

Bad97ta on Jan 10, 2008

Sep 23, 2008 10:49 AM
by mikelam

4

2,592

02, bypass, c5, causing, corvette, headers, long, p0420, problems, sensor, tube

What LT Headers do not give 02 sensor problems?

(

1 2 3 ... Last Page)

tsts on Jul 7, 2008

Jul 10, 2008 12:14 PM
by Mike Mercury

72

4,027

accelerating, eliminating, p0420, p0430, pipes, road, speedometer, video

I am absolutely stumped

(

1 2 3)

99FRC Newb on Apr 24, 2008

Apr 30, 2008 10:58 AM
by 99FRC Newb

59

4,444

code, codes, disable, hp, hptuners, mask, p0420, p0430, permanently, po420, tuners, turn, vette

Disable P0420 and P0430?

clif on Apr 3, 2008

Apr 3, 2008 10:31 AM
by FRCTony

2

3,624

c5, cats, corvette, header, install, p0420, p0430, po430, warranty

some help with p0420 and p0430 please

bill mcdonald on Feb 4, 2008

Mar 4, 2008 08:04 PM
by flynbya2

15

2,336

c5, code, codep0420, codes, corvette, fault, p0420, p10420, pcm

PCM...Code P0420

6SPD98 on Mar 1, 2008

Mar 1, 2008 10:27 PM
by 6SPD98

6

1,924

P0420 P0430 Error

BaileyD on Nov 19, 2007

Nov 19, 2007 05:37 PM
by Humanoid 2.0

7

891

2003, 2004, c5, corvette, cost, p0420, p0430, remove, tune

P0420 & P0430-need help

bdiddo on Oct 23, 2007

Oct 26, 2007 01:43 AM
by bdiddo

9

1,552

c5, check, code, corvette, dic, engine, light, ls1, p0420, po420, po430

Check Engine Light -- DIC Code P0420

2K4Vert on Oct 4, 2007

Oct 5, 2007 10:16 AM
by 2K4Vert

3

1,064

[Z06]

code..P0420

captej on Sep 16, 2007

Sep 16, 2007 04:17 PM
by captej

4

786

0420, 1999, c5, car, code, corvette, hurt, p0420, pcm, pcm0420

help with engine code PCM 0420

goatjacket on Aug 26, 2007

Aug 26, 2007 09:34 PM
by Y2Kvert4me

4

925

08, 2006, 420, c6, code, corvette, header, headers, install, p0420, p0430, po420, race, ripp, z06

Headers P0420 Code

toro1966 on Jul 28, 2007

Jul 29, 2007 07:02 PM
by don.donc

16

4,653

0430, c5, code, corvette, cross, dtc, error, hc, ls1, p0154, p0155, p0420, p0430, trouble, z06

code p0430 ?

royski on Jun 14, 2007

Jun 15, 2007 12:24 AM
by royski

4

3,867

auto, bank, c5, code, corvette, dtc, efficiency, headers, kooks, low, lt, means, p0420, system, twc

What does this code mean? P0420 TWC System Low Efficiency Bank 1

OMG its Jason on Jun 6, 2007

Jun 7, 2007 06:47 AM
by trussme

5

7,604

c, c5, chevrolet, clear, code, codes, corvette, dtc, erase, p0420, wont

DTC codes wont clear?

dfwblk2003Z06 on May 30, 2007

May 30, 2007 08:13 AM
by runamuk

1

1,424

[Z06]

P0420 Code question....

skeeterJD on Mar 27, 2007

Mar 28, 2007 04:32 AM
by BlackZ06

1

509

bank, c5, corvette, efficiency, low, p0420, po420, system, twc

P0420-TWC System Low Efficiency Bank 1 questions...

skeeterJD on Mar 27, 2007

Mar 27, 2007 05:46 PM
by skeeterJD

4

873

0430, 2007, c5, charger, code, dtc, intermittent, p0133, p0420, p0430, p1133, pcm, z06

Pcm Code P0430c

atsugidad on Feb 26, 2007

Mar 22, 2007 08:48 PM
by cbrf4i1

7

2,192

07, 2004, c5, c6, cat, code, corvette, ctsv, delete, o2, p0420, rear, sensors, sims, tuning, z06

[Headers] P0420 cat code - Delete rear O2's or O2 sims?

JR_VETTE on Oct 2, 2006

Oct 2, 2006 08:22 PM
by LS6 TECH

4

1,332

bad, c5, cats, code, corvette, p0420, signs

P0420 Code - Bad Cat

billjax on Sep 23, 2006

Sep 23, 2006 02:14 PM
by billjax

0

462

2002, code, codes, corvette, dic, o2s, p0420, p0420corvette, po420, rear, shut, tuner, turn

DIC Code P0420

PVHolgado on Jul 26, 2006

Jul 28, 2006 10:26 AM
by Billdog350

4

946

0420, 3030, c5, c6, clear, code, corsa, corvette, cot, erase, innova, p0420, p0420p0430, po420, ways

How To Clear Code? P0420?

(

1 2)

BIGGGIE on Jul 6, 2006

Jul 10, 2006 09:15 PM
by BIGGGIE

21

5,303

Am I OK to drive back to Canada with these codes??? P0420 & P0430

4GTABODT on May 17, 2006

May 18, 2006 09:15 AM
by 99 vett babycar

7

894

0420, 2006, bank, c4, c5, chevy, code, codes, corvette, engine, ls1, p0420, p0430, po420, reset, z06

Code Help - P0420, P0430

sgrubbs on Mar 8, 2006

Mar 8, 2006 01:12 PM
by rudolph schenker

6

1,691

0420, 2002, c, c5, chevrolet, code, codes, corvette, dtc, hc, ls1, p0420, p0440, po420, po440, z06

P0420 H C Code

billjax on Feb 4, 2006

Feb 6, 2006 07:32 PM
by dpd

7

3,504

2004, air, code, corvette, error, p0420, secondary, shut, valve

Code p0410 and engine running rich...

ex-bmw-man on Jan 17, 2006

Jan 30, 2006 11:45 AM
by dpd

15

1,362

code p0420 h c

my1stvette.33 on Sep 7, 2005

Oct 2, 2005 12:44 PM
by boosted_z06

4

818

bank, codes, corvette, efficiency, engine, ho2s, inefficiency, low, p0128, p0131, p0420, sensor, sys, system, twc

Code Help--P0420 TWC System Low Efficiency Bank 1-A

CCONKLIN1 on Sep 3, 2005

Oct 1, 2005 08:14 PM
by Greenbeast

9

7,804

1a, bank, code, corvette, diagnostic, efficiency, low, p0420, system, twc

TWC System Low Efficiency Bank 1 code

2003silvercorvette on Jul 13, 2005

Jul 13, 2005 05:40 PM
by torchredfrc

3

1,787

0420, c5, code, corvette, error, headers, light, longtube, ls1, mil, oxygen, p0420, pcm, po420, reported, senor, slp

Code P0420 need opinions

FrankTank on May 4, 2005

May 10, 2005 11:02 PM
by dvettetech

8

1,860

40-BCM and 10-PCM showing codes...

StuzVette on Jan 11, 2005

Jan 13, 2005 10:18 AM
by StuzVette

6

6,115

SES code P0420 (suggestions on replacement cats)

jcook00 on Oct 27, 2004

Oct 27, 2004 06:18 PM
by SunCr

9

495

0420, 0430, c6, code, corvette, engine, headers, p0420, po420

Headers and P0420

(

1 2)

Dirty Howie on Sep 18, 2004

Sep 20, 2004 11:55 PM
by SLO VETTE

20

1,798

DTC P0420

Horseshoe Dozer on May 18, 2004

May 18, 2004 11:56 AM
by Horseshoe Dozer

2

585

DTC CODE P0420 (KOOKS HEADERS & HI-FLOW CATS )

DNAST1 on May 9, 2004

May 9, 2004 01:19 PM
by TT_Vert

1

1,608

What's code P0420 Low Efficiency Bank mean?

KKu77 on Feb 18, 2004

Feb 19, 2004 10:57 PM
by KKu77

4

4,134

10pcm, c5, camaro, changing, code, codes, corvette, engine, malfunction, octane, p0420, p0430, pcm, po420, remedy

PCM codes P0420 & P0430 Replace CATS Anyone have these codes?

speedyc5 on Feb 1, 2004

Feb 7, 2004 10:48 AM
by speedyc5

11

2,164

c, c5, chevrolet, code, corvette, custom, dtc, ls1, p0420, po420, tune

I need some help with code P0420 H C .. LS1 edit ?

YOULLUZ on Jun 19, 2003

Jun 21, 2003 12:53 PM
by YOULLUZ

2

709