p0420 - ClubLexus - Lexus Forum Discussion

Thread / Thread Starter

Last Post

Replies

Views

Forum

Any DIY tips for replacing rear catalytic converter?

jeremy93ls on Dec 11, 2025

Dec 16, 2025 10:21 AM
by jkayca

9

562

ES - 1st to 6th Gen (1990-2018)

GS300 cat problem

popek31 on Jul 20, 2017

Sep 26, 2023 03:03 PM
by canatto

8

11,126

GS - 3rd Gen (2006-2011)

catalytic convertor, check engine light, emissions, p0420

Live data O2 readings and code P0420

1stock2is on Sep 1, 2023

Sep 1, 2023 01:17 PM
by 1stock2is

0

910

IS - 2nd Gen (2006-2013)

c1201, is250, mechanic, nashville, p0420

P0420 VSC Light & Wheel Speed Sensors C0200, C0205 C0215

brcollings on Aug 20, 2018

Jun 17, 2023 09:57 PM
by Winslow96

1

3,861

IS - 2nd Gen (2006-2013)

Replaced cats on both sides, still getting P0420

Gmoney32 on May 20, 2023

May 20, 2023 07:10 AM
by Gmoney32

0

700

LX - 1st and 2nd Gen (1996-2007)

06, 2007, 330, 430, alarm, alternator, bad, c1223, c1241, code, gx470, lexus, p0420, p0430, replaced, tracoff, vsc

AWD, VSC alarms with Codes P0420 and P0430

(

1 2)

clyde1952 on Oct 22, 2013

Mar 16, 2023 01:55 PM
by Rxlexus350

23

16,777

RX - 3rd Gen (2010-2015)

04, 2004, 330, catalytic, check, code, converter, engine, lexus, p0420, problem, problems, rx, rx300, rx330

2004 RX330 catalytic converter issue P0420

(

1 2)

djensen623 on May 3, 2011

Jan 23, 2023 01:04 PM
by vitieubao

18

52,940

RX - 2nd Gen (2004-2009)

2004, 2005, 33o, catalytic, code, codes, convetor, es330, es350, lexus, p0420, p0430, p430, po430, rx, rx330, trouble

2004 rx 330 - P0430 code

(

1 2)

soda7o on Oct 6, 2011

Oct 9, 2021 07:12 AM
by artfelt

16

60,557

RX - 2nd Gen (2004-2009)

2003, emissions test, es300, p0420, smog test

Smog Test Soon - 2003 ES300, Code P0420

LanceLink on Jan 11, 2020

Jan 12, 2020 12:05 PM
by Arsenii

3

703

ES - 1st to 6th Gen (1990-2018)

Check engine light p0420 code

Jweb2 on Dec 20, 2019

Dec 20, 2019 08:10 PM
by Byprodrive

8

19,603

GS - 4th Gen (2013-2020)

02 sensor, 2002 es300, catalytic converter, p0420

Check engine, trac off and vsc light on at same time, have error codes! read on...

DIYDD on May 22, 2017

Oct 2, 2019 10:11 PM
by Richardsr

11

8,719

ES - 1st to 6th Gen (1990-2018)

P0430 and pending P0420

Orion1019 on Jan 28, 2019

Jan 28, 2019 04:05 PM
by Orion1019

0

1,001

IS - 2nd Gen (2006-2013)

catalyticconverters, es330, p0420, p0430, p2241

Nagging P0430 (and now a pending P0420 too!) 2004 ES330

mjbtn on Dec 28, 2018

Jan 3, 2019 06:03 PM
by Nad1370

8

2,265

ES - 1st to 6th Gen (1990-2018)

My Journey to solve the P0420 error - NOT RESOLVED!

myculito on Oct 7, 2018

Oct 16, 2018 01:38 PM
by myculito

10

6,367

IS - 2nd Gen (2006-2013)

catalytic converter, es 300, es300, oxygen sensor, p0420

ES 300 P0420 issue - fixed

satiger on Sep 16, 2018

Oct 9, 2018 05:57 AM
by ArmyofOne

8

2,890

ES - 1st to 6th Gen (1990-2018)

catalyst, p0420, trac off light, vsc light

VSC and Cel on P0420 code catalyst threshold

mvrod on Sep 29, 2018

Oct 3, 2018 02:24 PM
by mvrod

3

1,432

IS - 2nd Gen (2006-2013)

gears, p0420, p0500, slipping, transmission

RX300 01 Transmission gears slipping help please

zer0xhdx01 on Oct 21, 2017

Nov 5, 2017 08:25 PM
by zer0xhdx01

3

2,626

RX - 1st Gen (1999-2003)

ES300 1999 addressing P1354 on heels of P0446 on heels of P0420

blckphillp on Sep 22, 2016

Feb 22, 2017 09:09 PM
by blckphillp

10

3,493

ES - 1st to 6th Gen (1990-2018)

1354, 1999, 430, auto, code, control, es300, lexus, ls, oil, p0420, p1354, sc400, symptoms, valve

Question on Codes p1354 and P0420

bronco2454 on Aug 4, 2012

Nov 27, 2016 07:04 PM
by burteboy

4

2,724

ES - 1st to 6th Gen (1990-2018)

Can I use spacers on my downstream 02 sensor?

ssgi4in12 on Nov 14, 2016

Nov 14, 2016 07:55 AM
by JAB

1

1,566

RX - 1st Gen (1999-2003)

1998, 300, 98, cel, code, es, es300, gs, gs430, lexus, lexuses, ls400, p0420, po420, rx300

Code p0420 and interesting turn aorund.....

satiger on Feb 16, 2010

Nov 29, 2015 11:25 AM
by azcat90

7

11,591

ES - 1st to 6th Gen (1990-2018)

Need help -Error Codes on ls400 1998 - p0420, p1126, p1129

secolor on Sep 19, 2015

Sep 19, 2015 02:31 PM
by secolor

0

2,088

LS - 1st and 2nd Gen (1990-2000)

Code P0420. Bad Catalytic or O2 sensor?

bb2tosc on Jul 23, 2015

Jul 29, 2015 03:34 PM
by 3L4jzz31

2

4,901

SC - 1st Gen (1992-2000)

catalytic converter, gs300, oxygen sensor, p0420, p0430

2001 GS300 P0420 and P0430

20012003rx on Jun 1, 2015

Jun 13, 2015 10:22 AM
by Mcon

6

6,762

GS - 2nd Gen (1998-2005)

P0330 & P0420 Appear after O2 sensors replaced (RX300)

RyanBill on Feb 6, 2015

Feb 11, 2015 11:01 AM
by RayN

5

4,779

RX - 1st Gen (1999-2003)

2006, 300, actron, autoscanner, backfire, codes, gs, is300, lexus, ls460, means, p0420, vsc

P0420!! What does this mean?

(

1 2)

Kumar350 on Apr 17, 2013

Nov 16, 2014 09:03 AM
by Bichon

26

13,180

IS - 2nd Gen (2006-2013)

2005 gx470 obd11 p0420 p0430

hamedmoosa on Aug 15, 2014

Sep 8, 2014 03:27 PM
by 470SNC

7

18,816

GX - 1st Gen (2003-2009)

catalalyic, misfire, oxygen sensor, p0420

Please need help regarding 2006 Lexus GS 300 OBD Codees

goodbadboy on Aug 14, 2014

Aug 15, 2014 05:58 AM
by goodbadboy

4

4,633

GS - 3rd Gen (2006-2011)

catalytic converter, clogged, p0420, p0430

What if I remove cat converters? - no emissions control here

(

1 2)

Eliaquim on Jun 12, 2014

Jul 9, 2014 12:57 PM
by Eliaquim

16

10,419

RX - 2nd Gen (2004-2009)

P0420 & P0430 Help please

(

1 2)

srob817 on Jun 7, 2014

Jun 20, 2014 10:51 PM
by aneidiaz

23

15,514

GS - 2nd Gen (1998-2005)

Threads Tagged with p0420