Threads Tagged with p0420

Generation IV External Engine

P0420 Error after Cold Air Intake install

bradtabor on Jul 6, 2014

Jul 6, 2014 11:44 PM
by 2xLS1

1

5,540

1500, 2006, check, chevy, code, engine, p0420, silverado

Heres a crazy idea.

LIMITLESS92 on Jul 2, 2014

Jul 2, 2014 03:31 PM
by RPM WS6

2

913

General LSX Automobile Discussion

0420, 2003, 2004, cadalic, cadillac, chevy, code, codes, cts, fualt, p0420, p0455, pcm, po455, silverado, sts

P0420 & P0455 codes disabled, still pass emissions?

rel3rd on Dec 5, 2013

Dec 14, 2013 10:42 AM
by mattcrp1

5

5,354

bank, catalyst, check, efficiency, fordmustang, ho2s, insufficient, o2, overheating, p0420, sensor, switching, system, threshold, voltage

Are My Cat's Blocked?

TallgeeseIV on Sep 25, 2013

Sep 26, 2013 10:43 AM
by TallgeeseIV

9

4,248

Generation IV External Engine

02, 2002, camaro, codes, corvette, p0420, p0430, repair, simm

p0430 p0420 02 simulators..not working?

Black 97 WS6 on Sep 18, 2013

Sep 18, 2013 07:06 PM
by Black 97 WS6

0

1,339

P0102

Mista Blazer on Dec 30, 2012

Jun 11, 2013 07:37 AM
by GMRL

19

9,024

2000, 2010, camaro, cat, catalytic, code, downstream, efficiency, headers, kooks, low, ls1tech, o2, p0420, po420, post, reading, readings, sensor, trans, voltage, ws6

P0420 Code

(

1 2)

FirebirdX on Jan 17, 2012

Apr 23, 2013 11:51 AM
by Jonota

20

20,818

P0420 w/strange O2 indications

Jonota on Jan 29, 2013

Apr 19, 2013 10:26 PM
by Jonota

11

1,265

1, bank, catalyst, efficiency, p0420, passenger, side, threshold, trans

Process For Different Computer

HibachiZ28 on Jan 3, 2013

Apr 16, 2013 03:07 PM
by HibachiZ28

17

1,446

Cadillac CTS-V 2004-2007 (Gen I)

10, 280zx, 4500, 4th, 60130, cadillac, cts, email, fast, gear, jerrysfordcom, lbs, ls1, mile, p0420, quarter, swap

60-130 4th gear

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1 2 3 4)

795MD on Dec 28, 2012

Jan 20, 2013 06:02 PM
by MN_V

71

8,583

2004, 53l, long, ls4, oil, p0420, pump, rr, zo6

More low oil!

(

1 2)

jbrockwell on Dec 3, 2012

Dec 6, 2012 03:38 PM
by jbrockwell

20

1,876

Generation III Internal Engine

10, car, cat, caused, causing, clogged, code, cylinder, hemi, misfire, mod, p0300, p0420, plugged, po420, s10

p0300 and p0420.."clogged" cat..random misfire?

arock24 on Jan 30, 2012

Nov 30, 2012 02:03 PM
by arock24

6

19,798

02, 04, gto, hp, log, lq9, negative, p0420, pontiac, rich, stft, swap, throttle, trans, tuners

Need help understanding a STFT problem!

(

1 2)

outkast6991 on Aug 9, 2012

Aug 11, 2012 07:14 PM
by BLK02WS6

22

3,120

DTC code and exhaust help - P0420

Bacon on Jul 19, 2012

Jul 19, 2012 05:38 PM
by FLURY123

8

2,564

06, 2005, caddillac, cadilac, cadillac, code, codep0420, cts, downstream, o2, p0420, p0420p0430, p0430, remove, sensor, ss, sts, trailblazer

UPDATE P0420 & p0430(codes gone after repairs) Now P0054

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1 2)

54inches on Feb 19, 2012

Jul 15, 2012 06:23 PM
by 54inches

20

27,104

02, 1997, c280, dallas, edit, limiter, location, ls1, lt1, p0420, rear, rev, sensor, tx, z28

Anyone in here have LS1 edit? I need a few things....

Mike96z on Feb 29, 2012

Mar 3, 2012 02:56 AM
by Mike96z

2

867

Texas Members

2000, 2002, camaro, exhaust, generic, gm, mil, p0420, po420, pontiac, soot, ta, trans, v8, z28

P0420 DTC, MIL On, have a generic ?

GormanRacingZ28 on Jan 7, 2012

Jan 8, 2012 01:55 PM
by RPM WS6

4

1,330

02, 0420, 2002, 420, 99, bad, camaro, camero, cat, chevrolet, code, ls1, oem, p0420, po, po420, z28

02' Z28 Camaro P0420 Cat Efficiency!!!!

GormanRacingZ28 on Dec 17, 2011

Dec 18, 2011 10:03 AM
by 99canadahawk

5

8,077

0420, bad, code, diablo, engine, ford, high, idle, idleing, idles, jetta, maf, p0420, p420, stop, tuner

P0420 Sets At idle only

T/A2000 on Nov 16, 2011

Nov 17, 2011 11:04 AM
by T/A2000

6

6,902

cat, code, diablosport, diagnostic, error, headers, hp, installing, ls3, lt1, p0420, retune, slp, tune, tuners

Have a P0420 Code after Header Install ?

99canadahawk on Oct 4, 2011

Oct 9, 2011 03:58 PM
by 99canadahawk

9

11,462

2001, 2002, andp0420, camaro, code, fixed, inspection, nc, p0171, p0420, pass, po420, pontiac, state, trans

Trying to Pass Inspection-P0171 and P0420

Harmon on Sep 24, 2011

Oct 1, 2011 04:25 PM
by Harmon

7

2,304

anti, camaro, code, fouler, foulers, ls1, mitsubishi, multiple, o2, p0420, p420, plug, procedure, spark, trick, work

Code P0420, use rear o2 anti foulers?

98blueSS420 on Aug 8, 2011

Aug 12, 2011 10:59 PM
by Zlow28

7

6,295

bank, catalyst, cherokee, efficiency, engine, filter, grand, kn, ls1, ls1tech, mpg, p0420, system, tech, threshold

P0420 & Best MPG Yet...??

HibachiZ28 on Jul 28, 2011

Aug 11, 2011 12:24 PM
by HibachiZ28

5

2,401

1998, 2000, 90442, arh, b0040, b0041, cat, cel, front, fuel, ls1tech, p0418, p0420, pontiac, sensor, smell, trans, wheel

Long list of things that dont make me happy.

14k on Aug 3, 2011

Aug 4, 2011 08:30 PM
by bobbyd

9

1,596

0420, 2001, 2002, 38, 99, camaro, chevy, code, exhaust, ls1tech, missing, p0420, p420, po420, rattles, v6

P0420, changed cat & rear 02, CEL still come on

Fotis on Jul 29, 2011

Aug 4, 2011 12:21 AM
by SuperSpeed27

10

5,328

Pontiac Firebird 1967-2002

2002, accelerating, acceleration, bad, calumet, city, corvette, firebird, gas, il, issues, ls1, muffler, p0420, pontiac, problem, problems

Recent Acceleration Problem

chicagoam on Jun 27, 2011

Jun 28, 2011 09:44 PM
by chicagoam

1

711

03, 07, 2001, 2011, cherokee, code, denali, g8, grand, jeep, ls1tech, p0420, p420, patrick, po0420

P0420/430 Help me Obi Wan Patick G

rlwjr1 on Jun 23, 2011

Jun 23, 2011 04:14 PM
by 2002_Z28_Six_Speed

2

1,329

Pontiac G8 2008-09 & Chevrolet SS 2014+

01, 96, bank, code, codes, delete, filter, firebird, kn, ls1, p0420, po410, po420, pontiac, trouble

PO410 and PO420 help

Prediluted on Mar 29, 2011

Mar 29, 2011 01:58 PM
by Prediluted

0

1,189

Cadillac CTS-V 2004-2007 (Gen I)

Scott96LT1 on Mar 22, 2011

Mar 23, 2011 04:26 PM
by Scott96LT1

4

2,425

00, anti, code, fix, foul, fouler, foulers, grand, gtp, o2, p0420, plug, prix, rear, sensor, spark

P0420 Code

killian322 on Jan 12, 2011

Jan 12, 2011 01:46 PM
by JDMC5

12

5,855

LS4 Performance

04, 2500hd, air, flow, ford, gmc, ls1tech, maf, mass, misfire, p0101, p0300, p0420, po101, po300, po420, sierra

P0300, P0101, P0420 Please Help

Tim94gt on Dec 15, 2010

Dec 16, 2010 04:47 PM
by Tim94gt

1

4,767

New LS1 Owners - Newbie Tech

01, 2001camaro, camaro, lid, lm2, p0420, slp

2001 Camaro SS

Prediluted on Dec 6, 2010

Dec 6, 2010 04:09 PM
by NC01TA

1

973

What is it Worth?

2000, 2001, bank, cat, code, fix, gm, gs, inefficiency, inefficient, ineffiecient, ineficant, o2, p0420, regal, trace, z28

Cat inefficiency code, swapped cat, need help!

MR WESST 02 on Nov 20, 2010

Nov 24, 2010 10:02 PM
by BRUTL

8

1,081

2000, 2002, catalytic, chevrolet, converter, converters, corvette, extended, firebird, ls1, p0420, po420, pontiac, trans, waranty, warranty

P0420 - CAT - Warranty ?

dancrosoft on Jun 8, 2009

Oct 25, 2010 07:31 PM
by NBM-LS1

5

1,866

12, 2000, bank, camaro, codes, lean, mix, p0171, p0174, p0420, po171, po174, po420, pontiac, ss

p0174 p0171 bank 1 & 2 lean p0420 cat threshold

AldenSS on Sep 28, 2010

Sep 28, 2010 06:05 PM
by AldenSS

0

3,287

Generation III Internal Engine

02, antifoulers, bung, grand, hemi, install, ls1, mechanical, o2, p0420, prix, sensor, simulator, simulators, work

Mechanical O2 simulator works! So far....

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1 2)

Tappeter on May 18, 2009

Sep 9, 2010 09:30 PM
by Tappeter

36

34,853

LS4 Performance

02, cats, emision, emission, emissions, emmissions, emmsion, gm, p0420, parts, warenty, warrantee, warranty, warrenties, z28

warranty? for cat's and emission parts

z95lt1 on Aug 28, 2010

Aug 29, 2010 07:31 AM
by z95lt1

3

810

2008, code, corvette, ls1tech, p0420, thrown

p0420 code being thrown

rio95cobra on Jul 20, 2010

Jul 22, 2010 06:36 PM
by blk/slvr02ss

5

796

New LS1 Owners - Newbie Tech

02, cat, downstream, handheld, ls1, o2, o2s, p0420, rear, replaced, sensor, sensors, tune, tuner, tunes, tuning

How do I tune out downstream O2's on 98 SS ???

98blueSS420 on May 15, 2010

May 15, 2010 05:40 PM
by Pitbull329

1

843

1999, aftermarket, cat, catalyst, catlayst, cod, code, eliminating, exhaust, insufficient, long, ls1, ls1tech, p0420, po420, tubes

Code P0420 Help!

98blueSS420 on May 6, 2010

May 8, 2010 01:08 PM
by 98blueSS420

4

1,191

3800, cab, code, coming, fpr, fuel, fume, gas, grand, leaking, oil, p0420, raw, smell, v6

I Smell Fuel

Super-Bat on Apr 6, 2010

Apr 11, 2010 07:20 PM
by Super-Bat

15

1,559

Pontiac Firebird 1967-2002

0420, 2002, 99, code, codes, driver, firebird, fix, magnaflow, o2, p0420, pontiac, sensor, side, v6

P0420 Drivers side Cat/O2 sens.

ws6blackbird99 on Mar 26, 2010

Apr 4, 2010 01:35 PM
by 02transamce

2

1,663

02, cat, ls1tech, ls6, o2, p0420, sensor, sensors

P0420 Cat or O2 Sensor?

ws6blackbird99 on Mar 28, 2010

Mar 28, 2010 08:37 PM
by Xraycat35

1

957

2002, bogging, bogs, car, engine, impala, load, loosing, ls1, ls1bogging, o2, overdrive, p0420, power, sensor, trans

LS1 Bogging down and loosing power under load

ArkBird96 on Mar 8, 2010

Mar 11, 2010 08:44 AM
by ArkBird96

15

20,010

am, cat, cats, code, codes, dtc, eff, gm, normal, oil, onemeanls1z28, p0420, po420, pressure, trans

Car throwing P0420 code and oil pressure above normal

SonicBoom on Mar 2, 2010

Mar 6, 2010 06:32 PM
by 06tx4.8

7

4,076

Texas Members

cali, cat, driver, ls1, ls1tech, p0420, pass, replacement, side, smog, tuned

Need to change driver side cat, will it shut off SES?

415Z28 on Mar 4, 2010

Mar 5, 2010 01:30 PM
by jimmyblue

5

573

2002, 2004, 40, cadillac, code, cts, firebird, hemi, normal, oil, p0420, p420, pontiac, pressure, regulator

Car throwing P0420 code and oil pressure above normal

SonicBoom on Mar 2, 2010

Mar 3, 2010 02:13 PM
by SonicBoom

4

869

03, 05513, 38, 420, chevy, code, driving, firebird, gm, impala, multiple, p0420, po420, policy, special

PO 420 help

beyonddisturbed on Feb 24, 2010

Feb 26, 2010 09:24 PM
by joshp14

7

1,010