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Cleaning a cat. Or how to fix a P0420 code? #4751074
05/08/18 11:15 AM
05/08/18 11:15 AM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,949
Illinois
I've been getting the P0420 code on my Hyundai Accent(159k miles) it comes and goes on it's own, especially after some hard driving where the check engine light will go out. So I've decided to try and clean the cat.

I monitor the O2 voltage and you can see it does not work like a new one as it will more closely follow the primary 02 voltage rather than stay high like it should when cruising.

I took the primary O2 out. The cat hangs vertical. Then poured 2L of lacquer cleaner through it. Put O2 back in and then after a couple hours poured another L of the thinner.

My plan now is to let it sit overnight, then take the O2 out again and let it sit another 24 hours. Then put it back together, start it up and hope I don't blowout the cats and muffler......


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751081
05/08/18 11:21 AM
05/08/18 11:21 AM
Joined: Feb 2013
Posts: 11,077
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,077
Phoenix, AZ
I'd suggest wearing a long sleeve shirt before cleaning your cat



2015 Hyundai Sonata 2.4L 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: Nick1994] #4751083
05/08/18 11:25 AM
05/08/18 11:25 AM
Joined: Jun 2014
Posts: 2,730
Phoenix, Arizona - USA
SirTanon Online content
SirTanon  Online Content
Joined: Jun 2014
Posts: 2,730
Phoenix, Arizona - USA
Originally Posted By: Nick1994
I'd suggest wearing a long sleeve shirt before cleaning your cat


Where at least 2 of my cats are involved, chain mail or kevlar would be a more appropriate choice.


2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 266,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 60,000mi
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751086
05/08/18 11:29 AM
05/08/18 11:29 AM
Joined: Feb 2012
Posts: 87
NJ
irad Offline
irad  Offline
Joined: Feb 2012
Posts: 87
NJ
I did the same thing except I sprayed throttle body cleaner in through the O2 port instead of lacquer cleaner. Probably does not matter which you use. I then ran the car for a minute. Let it cool, then I removed the O2 sensor and poured distilled water in. I then ran the car until all the steam stopped coming out. It worked. I thought of the water because some people clean the intake valves and piston tops by putting water mist through the intake.

Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751096
05/08/18 11:35 AM
05/08/18 11:35 AM
Joined: Jun 2005
Posts: 11,610
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,610
Santa Barbara, CA
Or you could stack 2 spark plug non foulers, drill out the top one, and thread them between the cat and the cat monitor sensor.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751099
05/08/18 11:37 AM
05/08/18 11:37 AM
Joined: Jan 2017
Posts: 1,973
VW Fanboy Island
maxdustington Offline
maxdustington  Offline
Joined: Jan 2017
Posts: 1,973
VW Fanboy Island
I read a thread on here that mentioned using caustic soda or something of that nature, I wish I had booked marked it.
If a solvent dip could fix a cat, there would not be nearly as many cars in the boneyard.


03 Jetta AWP/09A 205k kms
Edge 0W40 + Mann 719/30
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751117
05/08/18 11:53 AM
05/08/18 11:53 AM
Joined: Dec 2014
Posts: 1,526
NY, USA, etc.
oilpsi2high Offline
oilpsi2high  Offline
Joined: Dec 2014
Posts: 1,526
NY, USA, etc.
You can't "clean" a cat unless it's clogged with oil. More often than not, the honey comb inside melts. You can't unmelt the metal.

You can either hollow it out and use an o2 anti-fouler and pray that the code goes away, or fix it the right way by replacing the cat.

Re: Cleaning a cat. Or how to fix a P0420 code? [Re: maxdustington] #4751127
05/08/18 12:03 PM
05/08/18 12:03 PM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline OP
SHOZ  Offline OP
Joined: Jun 2003
Posts: 5,949
Illinois
Originally Posted By: maxdustington
I read a thread on here that mentioned using caustic soda or something of that nature, I wish I had booked marked it.
If a solvent dip could fix a cat, there would not be nearly as many cars in the boneyard.
Hmm, I buy caustic soda in bulk. It is a great carbon remover. But the cat is still on the car and would need a good water flushing to get rid of the caustic.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: Nick1994] #4751130
05/08/18 12:08 PM
05/08/18 12:08 PM
Joined: Mar 2004
Posts: 21,105
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 21,105
Upstate NY
Originally Posted By: Nick1994
I'd suggest wearing a long sleeve shirt before cleaning your cat



My cat is self cleaning except for a few hair balls here and there.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: oilpsi2high] #4751136
05/08/18 12:17 PM
05/08/18 12:17 PM
Joined: Apr 2007
Posts: 736
Connecticut, USA
bmwpowere36m3 Offline
bmwpowere36m3  Offline
Joined: Apr 2007
Posts: 736
Connecticut, USA
Originally Posted By: oilpsi2high
You can't "clean" a cat unless it's clogged with oil. More often than not, the honey comb inside melts. You can't unmelt the metal.

You can either hollow it out and use an o2 anti-fouler and pray that the code goes away, or fix it the right way by replacing the cat.


+1

You can "hack it", but I'd be preparing to replace if the car requires emissions testing...

Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751142
05/08/18 12:21 PM
05/08/18 12:21 PM
Joined: Jan 2010
Posts: 151
Olathe, KS
CARJ Offline
CARJ  Offline
Joined: Jan 2010
Posts: 151
Olathe, KS
Have you ever replaced your O2 sensors?


2004 Toyota 4Runner | 180k | PYB 5w-30, PH3614
2012 VW Passat | 85k | PPHM/Redline 5w-30, XG9911
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751148
05/08/18 12:24 PM
05/08/18 12:24 PM
Joined: Jun 2014
Posts: 2,730
Phoenix, Arizona - USA
SirTanon Online content
SirTanon  Online Content
Joined: Jun 2014
Posts: 2,730
Phoenix, Arizona - USA
... or you could do what Scotty Kilmer says (I certainly wouldn't, but whatever), and do this:



2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 266,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 60,000mi
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751198
05/08/18 01:23 PM
05/08/18 01:23 PM
Joined: Dec 2006
Posts: 1,460
Michigan
MrHorspwer Offline
MrHorspwer  Offline
Joined: Dec 2006
Posts: 1,460
Michigan
An appropriate retort to anything Scotty Kilmer says:


Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751262
05/08/18 02:22 PM
05/08/18 02:22 PM
Joined: Nov 2006
Posts: 20,564
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,564
MA, Mittelfranken.de
Like any plating once its gone its gone its gone you can clean it till you are blue in the face but its not coming back. The amount of wash coat is one of the big differences between OE and aftermarket.
Unfortunately this one of those times you cant put Humpty Dumpty back together.


ASE L1, Master. Deutsch Meisterbrief.
Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ] #4751316
05/08/18 03:19 PM
05/08/18 03:19 PM
Joined: May 2005
Posts: 3,514
Alberta, Canada
Smokescreen Offline
Smokescreen  Offline
Joined: May 2005
Posts: 3,514
Alberta, Canada
crackmeup MrHorspwer, that made my day !!!


13 Civic Si 2.4L- 69Kkms(43Kmi)-PP,Wix
05 LeSabre 3.8L-210Kkms(134Kmi)-PP,Wix
03 Sierra 2500 6.0L-204Kkms(127Kmi)-PP,Wix

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