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#4811479 - 07/11/18 03:35 PM The dread P420 code
Oldtom Offline


Registered: 07/05/14
Posts: 334
Loc: Cecil County 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.

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#4811483 - 07/11/18 03:42 PM Re: The dread P420 code [Re: Oldtom]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6342
Loc: USA
Replace the cat and the oxygen sensors smile

Rock Auto has a Walker cat for about $100

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#4811486 - 07/11/18 03:45 PM Re: The dread P420 code [Re: Oldtom]
MCompact Offline


Registered: 07/21/02
Posts: 4188
Loc: KY
Spark plug anti-foulers will do the same thing.
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#4811490 - 07/11/18 03:51 PM Re: The dread P420 code [Re: slacktide_bitog]
Wolf359 Online   content


Registered: 04/27/12
Posts: 4874
Loc: 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.

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#4811496 - 07/11/18 03:54 PM Re: The dread P420 code [Re: Oldtom]
SHOZ Offline


Registered: 06/28/03
Posts: 5801
Loc: 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

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#4811501 - 07/11/18 03:57 PM Re: The dread P420 code [Re: Oldtom]
dogememe Offline


Registered: 04/15/17
Posts: 692
Loc: 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.


Edited by dogememe (07/11/18 03:57 PM)
_________________________
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#4811502 - 07/11/18 03:58 PM Re: The dread P420 code [Re: Oldtom]
JamesBond Offline


Registered: 12/13/06
Posts: 859
Loc: 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.

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#4811508 - 07/11/18 04:03 PM Re: The dread P420 code [Re: Oldtom]
Nick1994 Online   content


Registered: 02/19/13
Posts: 10277
Loc: 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 80k Mobil 1 AFE 0w30 & OEM
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1996 Jeep Cherokee 4.0L 146k Mobil 1 HM 10w40 & Fram Ultra

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#4811510 - 07/11/18 04:05 PM Re: The dread P420 code [Re: Oldtom]
mehullica Offline


Registered: 08/19/09
Posts: 563
Loc: 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.

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#4811519 - 07/11/18 04:12 PM Re: The dread P420 code [Re: MCompact]
rooflessVW Offline


Registered: 12/24/11
Posts: 4301
Loc: North Carolina
Originally Posted By: MCompact
Spark plug anti-foulers will do the same thing.

Exactly. Gut the cat and space the O2.
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"Zed's dead baby, Zed's dead."

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#4811520 - 07/11/18 04:15 PM Re: The dread P420 code [Re: Oldtom]
Audios Offline


Registered: 11/19/11
Posts: 942
Loc: 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
2005 BMW M3 BMW Twin Power 10/60
1998 BMW M3/4/5 Fuchs 5/40
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL

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#4811565 - 07/11/18 05:01 PM Re: The dread P420 code [Re: MCompact]
eljefino Offline


Registered: 06/15/03
Posts: 32763
Loc: ME
Originally Posted By: MCompact
Spark plug anti-foulers will do the same thing.


+2

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#4811573 - 07/11/18 05:14 PM Re: The dread P420 code [Re: Oldtom]
Chris142 Online   content


Registered: 06/05/03
Posts: 16947
Loc: Deplorable in apple valley, ca
Make sure that you don't have any vacuum leaks. Those can cause the 420 code too.
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87 F250 traveler 15w40
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#4811627 - 07/11/18 06:18 PM Re: The dread P420 code [Re: Oldtom]
LeakySeals Offline


Registered: 02/18/11
Posts: 6618
Loc: Hudson, NH
There is a price to pay for oil consumption.
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06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 152k ST HM 10w30

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#4811671 - 07/11/18 07:06 PM Re: The dread P420 code [Re: Oldtom]
FermeLaPorte Online   content


Registered: 07/25/17
Posts: 500
Loc: Texas (south)
Time to move to another state
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