Threads Tagged with p0420

Generation IV External Engine

P0420 Error after Cold Air Intake install

bradtabor on 07-06-2014

07-06-2014 11:44 PM
by 2xLS1

1

5,017

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

Heres a crazy idea.

LIMITLESS92 on 07-02-2014

07-02-2014 03:31 PM
by RPM WS6

2

862

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 12-05-2013

12-14-2013 10:42 AM
by mattcrp1

5

4,721

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

Are My Cat's Blocked?

TallgeeseIV on 09-25-2013

09-26-2013 10:43 AM
by TallgeeseIV

9

3,827

Generation IV External Engine

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

p0430 p0420 02 simulators..not working?

Black 97 WS6 on 09-18-2013

09-18-2013 07:06 PM
by Black 97 WS6

0

1,287

P0102

Mista Blazer on 12-30-2012

06-11-2013 07:37 AM
by GMRL

19

8,756

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 01-17-2012

04-23-2013 11:51 AM
by Jonota

20

17,997

P0420 w/strange O2 indications

Jonota on 01-29-2013

04-19-2013 10:26 PM
by Jonota

11

1,214

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

Process For Different Computer

HibachiZ28 on 01-03-2013

04-16-2013 03:07 PM
by HibachiZ28

17

1,348

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 12-28-2012

01-20-2013 06:02 PM
by MN_V

71

7,494

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

More low oil!

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1 2)

jbrockwell on 12-03-2012

12-06-2012 03:38 PM
by jbrockwell

20

1,724

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 01-30-2012

11-30-2012 02:03 PM
by arock24

6

18,039

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 08-09-2012

08-11-2012 07:14 PM
by BLK02WS6

22

2,729

DTC code and exhaust help - P0420

Bacon on 07-19-2012

07-19-2012 05:38 PM
by FLURY123

8

2,409

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 02-19-2012

07-15-2012 06:23 PM
by 54inches

20

26,628

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 02-29-2012

03-03-2012 02:56 AM
by Mike96z

2

794

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 01-07-2012

01-08-2012 01:55 PM
by RPM WS6

4

1,232

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 12-17-2011

12-18-2011 10:03 AM
by 99canadahawk

5

7,717

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

P0420 Sets At idle only

T/A2000 on 11-16-2011

11-17-2011 11:04 AM
by T/A2000

6

6,115

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

Have a P0420 Code after Header Install ?

99canadahawk on 10-04-2011

10-09-2011 03:58 PM
by 99canadahawk

9

10,155

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

Trying to Pass Inspection-P0171 and P0420

Harmon on 09-24-2011

10-01-2011 04:25 PM
by Harmon

7

2,224

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 08-08-2011

08-12-2011 10:59 PM
by Zlow28

7

5,712

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

P0420 & Best MPG Yet...??

HibachiZ28 on 07-28-2011

08-11-2011 12:24 PM
by HibachiZ28

5

2,234

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 08-03-2011

08-04-2011 08:30 PM
by bobbyd

9

1,441

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 07-29-2011

08-04-2011 12:21 AM
by SuperSpeed27

10

5,183

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 06-27-2011

06-28-2011 09:44 PM
by chicagoam

1

661

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 06-23-2011

06-23-2011 04:14 PM
by 2002_Z28_Six_Speed

2

1,257

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 03-29-2011

03-29-2011 01:58 PM
by Prediluted

0

1,137

Cadillac CTS-V 2004-2007 (Gen I)

Scott96LT1 on 03-22-2011

03-23-2011 04:26 PM
by Scott96LT1

4

2,290

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

P0420 Code

killian322 on 01-12-2011

01-12-2011 01:46 PM
by JDMC5

12

5,689

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 12-15-2010

12-16-2010 04:47 PM
by Tim94gt

1

4,502

New LS1 Owners - Newbie Tech

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

2001 Camaro SS

Prediluted on 12-06-2010

12-06-2010 04:09 PM
by NC01TA

1

923

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 11-20-2010

11-24-2010 10:02 PM
by BRUTL

8

990

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

P0420 - CAT - Warranty ?

dancrosoft on 06-08-2009

10-25-2010 07:31 PM
by NBM-LS1

5

1,805

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 09-28-2010

09-28-2010 06:05 PM
by AldenSS

0

3,103

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 05-18-2009

09-09-2010 09:30 PM
by Tappeter

36

34,153

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 08-28-2010

08-29-2010 07:31 AM
by z95lt1

3

738

2008, code, corvette, ls1tech, p0420, thrown

p0420 code being thrown

rio95cobra on 07-20-2010

07-22-2010 06:36 PM
by blk/slvr02ss

5

732

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 05-15-2010

05-15-2010 05:40 PM
by Pitbull329

1

769

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

Code P0420 Help!

98blueSS420 on 05-06-2010

05-08-2010 01:08 PM
by 98blueSS420

4

1,073

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

I Smell Fuel

Super-Bat on 04-06-2010

04-11-2010 07:20 PM
by Super-Bat

15

1,502

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 03-26-2010

04-04-2010 01:35 PM
by 02transamce

2

1,600

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

P0420 Cat or O2 Sensor?

ws6blackbird99 on 03-28-2010

03-28-2010 08:37 PM
by Xraycat35

1

893

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 03-08-2010

03-11-2010 08:44 AM
by ArkBird96

15

18,883

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 03-02-2010

03-06-2010 06:32 PM
by 06tx4.8

7

3,562

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 03-04-2010

03-05-2010 01:30 PM
by jimmyblue

5

514

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 03-02-2010

03-03-2010 02:13 PM
by SonicBoom

4

750

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

PO 420 help

beyonddisturbed on 02-24-2010

02-26-2010 09:24 PM
by joshp14

7

962