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Re: The dread P420 code
[Re: Oldtom]
#4811486
07/11/18 02:45 PM
07/11/18 02:45 PM
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Joined: Jul 2002
Posts: 4,683 KY
MCompact
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Joined: Jul 2002
Posts: 4,683
KY
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Spark plug anti-foulers will do the same thing.
Mine: 2014 M235i 2009 Cooper Clubman 1999 Wrangler Sahara 1995 318ti Club Sport
Wife's: 2015 X1 xDrive28i M Sport
Son's 2009 328i
Buy what makes you smile...
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Re: The dread P420 code
[Re: slacktide_bitog]
#4811490
07/11/18 02:51 PM
07/11/18 02:51 PM
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Joined: Apr 2012
Posts: 6,065 MA
Wolf359
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Joined: Apr 2012
Posts: 6,065
MA
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Replace the cat and the oxygen sensors  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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Re: The dread P420 code
[Re: Oldtom]
#4811496
07/11/18 02:54 PM
07/11/18 02:54 PM
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Joined: Jun 2003
Posts: 5,975 Illinois
SHOZ
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Joined: Jun 2003
Posts: 5,975
Illinois
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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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Re: The dread P420 code
[Re: Oldtom]
#4811501
07/11/18 02:57 PM
07/11/18 02:57 PM
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Joined: Apr 2017
Posts: 1,731 San Rafael, CA
dogememe
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Joined: Apr 2017
Posts: 1,731
San Rafael, CA
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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 02:57 PM.
2010 Ford Escape 2.5 ~94K Miles: Royal Purple 5W-30 2008 Ford Crown Vic P71 4.6 ~167K Miles: AMSOIL SS 0W-30 1995 Chevy Silverado 5.7 ~277K Miles: Delo 10W-30
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Re: The dread P420 code
[Re: Oldtom]
#4811508
07/11/18 03:03 PM
07/11/18 03:03 PM
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Joined: Feb 2013
Posts: 11,261 Phoenix, AZ
Nick1994
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Joined: Feb 2013
Posts: 11,261
Phoenix, AZ
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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 91k Motorcraft Synthetic Blend 5w30 & OEM 2000 Toyota Camry 2.2L 232k Valvoline 5w30 & Fram Ultra 1996 Jeep Cherokee 4.0L 148k Mobil 1 HM 10w40 & Fram Ultra
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Re: The dread P420 code
[Re: MCompact]
#4811519
07/11/18 03:12 PM
07/11/18 03:12 PM
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Joined: Dec 2011
Posts: 5,509 North Carolina
rooflessVW
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Joined: Dec 2011
Posts: 5,509
North Carolina
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Spark plug anti-foulers will do the same thing. Exactly. Gut the cat and space the O2.
"Zed's dead baby, Zed's dead."
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Re: The dread P420 code
[Re: Oldtom]
#4811520
07/11/18 03:15 PM
07/11/18 03:15 PM
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Joined: Nov 2011
Posts: 1,413 Lyndhurst NJ
Audios
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Joined: Nov 2011
Posts: 1,413
Lyndhurst NJ
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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- M1 0/30 ESP 2005 BMW M3 BMW Twin Power 10/60 2003 BMW M5-Fuchs 5/40 1998 BMW M3/4/5 Fuchs 5/40
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Re: The dread P420 code
[Re: MCompact]
#4811565
07/11/18 04:01 PM
07/11/18 04:01 PM
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Joined: Jun 2003
Posts: 33,952 ME
eljefino
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Joined: Jun 2003
Posts: 33,952
ME
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Spark plug anti-foulers will do the same thing. +2
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Re: The dread P420 code
[Re: Oldtom]
#4811573
07/11/18 04:14 PM
07/11/18 04:14 PM
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Joined: Jun 2003
Posts: 18,229 Deplorable in apple valley, ca
Chris142
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Joined: Jun 2003
Posts: 18,229
Deplorable in apple valley, ca
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Make sure that you don't have any vacuum leaks. Those can cause the 420 code too.
02 Wrangler carlube 5w30 87 F250 traveler 15w40 07 fjcruiser Chevron 10w30 Z400 castrol T 10w40 Can am maveric edge 5w40 57 case tractor 15w40
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Re: The dread P420 code
[Re: Oldtom]
#4811627
07/11/18 05:18 PM
07/11/18 05:18 PM
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Joined: Feb 2011
Posts: 7,049 Hudson, NH
LeakySeals
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Joined: Feb 2011
Posts: 7,049
Hudson, NH
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There is a price to pay for oil consumption.
06 Escalade 6.0L LQ9 AWD 165k M1 0w40 03 Maxima 3.5L POS 162k ST HM 10w30 05 Malibu Classic 108k Unk
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Re: The dread P420 code
[Re: Oldtom]
#4811671
07/11/18 06:06 PM
07/11/18 06:06 PM
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Joined: Jul 2017
Posts: 542 Texas (south)
FermeLaPorte
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Joined: Jul 2017
Posts: 542
Texas (south)
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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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