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The dread P420 code #4811479
07/11/18 03:35 PM
07/11/18 03:35 PM
Joined: Jul 2014
Posts: 364
Ceciltucky Maryland
Oldtom Offline OP
Oldtom  Offline OP
Joined: Jul 2014
Posts: 364
Ceciltucky Maryland
I have a 1998 Toyota Tacoma with 2.4 liter 4 and 5 speed. Got a check engine light and Advance Auto said it was a P420 code. I have to get this truck through smog one last time before I register it as historic. I understand there are off road only O2 simulators that send a "clean" signal. Would this work as a temporary fix just to get thru smog one last time? Underdog Racing makes one.

Re: The dread P420 code [Re: Oldtom] #4811483
07/11/18 03:42 PM
07/11/18 03:42 PM
Joined: Mar 2008
Posts: 6,803
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 6,803
USA
Replace the cat and the oxygen sensors smile

Rock Auto has a Walker cat for about $100

Re: The dread P420 code [Re: Oldtom] #4811486
07/11/18 03:45 PM
07/11/18 03:45 PM
Joined: Jul 2002
Posts: 4,387
KY
MCompact Offline
MCompact  Offline
Joined: Jul 2002
Posts: 4,387
KY
Spark plug anti-foulers will do the same thing.


Mine:
2014 M235i
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2009 Cooper Clubman

Son's
2009 328i

Buy what makes you smile...
Re: The dread P420 code [Re: slacktide_bitog] #4811490
07/11/18 03:51 PM
07/11/18 03:51 PM
Joined: Apr 2012
Posts: 5,141
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,141
MA
Originally Posted By: slacktide_bitog
Replace the cat and the oxygen sensors smile

Rock Auto has a Walker cat for about $100


Ditto above. Some of us like to breathe too. This is like asking how to cheat on your taxes.

Re: The dread P420 code [Re: Oldtom] #4811496
07/11/18 03:54 PM
07/11/18 03:54 PM
Joined: Jun 2003
Posts: 5,920
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,920
Illinois
I got a new post cat sensor and a extended for my Accent. Code has not come back in 3 months.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: The dread P420 code [Re: Oldtom] #4811501
07/11/18 03:57 PM
07/11/18 03:57 PM
Joined: Apr 2017
Posts: 928
SF BAY AREA, CA
dogememe Online content
dogememe  Online Content
Joined: Apr 2017
Posts: 928
SF BAY AREA, CA
All new Denso (NOT Bosch junk) O2 sensors and reset the codes and take a few long highway trips and then take it for smog. If that doesn't work you need a new cat.

Last edited by dogememe; 07/11/18 03:57 PM.

2007 Crown Vic P71 4.6 ~126K Miles, Royal Purple HPS 5W-30, Royal Purple Filter, Daily Driver, 5K OCIs.
2010 Escape FWD 2.5 ~84K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo, 10-15K OCIs.
Re: The dread P420 code [Re: Oldtom] #4811502
07/11/18 03:58 PM
07/11/18 03:58 PM
Joined: Dec 2006
Posts: 911
midwest
JamesBond Offline
JamesBond  Offline
Joined: Dec 2006
Posts: 911
midwest
I get that code on my Honda every so often, usually after a long highway drive or after disconnecting the battery. I just reset it with the Torque app and I'm usually good for months. I've been doing this for years. I just make sure that there are no lights or codes, and it's run a drive cycle before I take it in for the stupid state inspection.

Re: The dread P420 code [Re: Oldtom] #4811508
07/11/18 04:03 PM
07/11/18 04:03 PM
Joined: Feb 2013
Posts: 10,682
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 10,682
Phoenix, AZ
Just get an aftermarket cat and have an exhaust shop on the bad side of town weld it on. I did that last year for my Jeep, was $40 to have it welded on.


2015 Hyundai Sonata 2.4L 84k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: The dread P420 code [Re: Oldtom] #4811510
07/11/18 04:05 PM
07/11/18 04:05 PM
Joined: Aug 2009
Posts: 575
Modesto,CA
mehullica Offline
mehullica  Offline
Joined: Aug 2009
Posts: 575
Modesto,CA
To answer your question & not get into an emissions morality thread, O2 simulators will work to pass smog if they use the correct capacitors inside. I know several people who use them in California with no issues.

Re: The dread P420 code [Re: MCompact] #4811519
07/11/18 04:12 PM
07/11/18 04:12 PM
Joined: Dec 2011
Posts: 4,738
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 4,738
North Carolina
Originally Posted By: MCompact
Spark plug anti-foulers will do the same thing.

Exactly. Gut the cat and space the O2.


"Zed's dead baby, Zed's dead."
Re: The dread P420 code [Re: Oldtom] #4811520
07/11/18 04:15 PM
07/11/18 04:15 PM
Joined: Nov 2011
Posts: 1,053
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,053
Lyndhurst NJ
Ive had luck with running a good injection cleaner, premium fuel, resetting everyhting and going up and down the highway in 4th gear, keeps the revs high and the cats hotter, and going right to inspection after about 50-55 miles. I believe they make a product called cat-a-clean but i cant comment on how it works.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: The dread P420 code [Re: MCompact] #4811565
07/11/18 05:01 PM
07/11/18 05:01 PM
Joined: Jun 2003
Posts: 33,073
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,073
ME
Originally Posted By: MCompact
Spark plug anti-foulers will do the same thing.


+2

Re: The dread P420 code [Re: Oldtom] #4811573
07/11/18 05:14 PM
07/11/18 05:14 PM
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
Make sure that you don't have any vacuum leaks. Those can cause the 420 code too.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: The dread P420 code [Re: Oldtom] #4811627
07/11/18 06:18 PM
07/11/18 06:18 PM
Joined: Feb 2011
Posts: 6,718
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,718
Hudson, NH
There is a price to pay for oil consumption.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: The dread P420 code [Re: Oldtom] #4811671
07/11/18 07:06 PM
07/11/18 07:06 PM
Joined: Jul 2017
Posts: 542
Texas (south)
FermeLaPorte Offline
FermeLaPorte  Offline
Joined: Jul 2017
Posts: 542
Texas (south)
Time to move to another state


Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.
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