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#4751074 - 05/08/18 12:15 PM Cleaning a cat. Or how to fix a P0420 code?
SHOZ Offline


Registered: 06/28/03
Posts: 5669
Loc: 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......
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2008 Hyundai Accent 1.6L 5 sp manual hatchback
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#4751081 - 05/08/18 12:21 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
Nick1994 Offline


Registered: 02/19/13
Posts: 9988
Loc: Phoenix, AZ
I'd suggest wearing a long sleeve shirt before cleaning your cat

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2015 Hyundai Sonata 2.4L 77k PU 5w30 & OEM
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#4751083 - 05/08/18 12:25 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: Nick1994]
SirTanon Offline


Registered: 06/23/14
Posts: 2069
Loc: 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.
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#4751086 - 05/08/18 12:29 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
irad Offline


Registered: 02/26/12
Posts: 58
Loc: 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.

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#4751096 - 05/08/18 12:35 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
bdcardinal Offline


Registered: 06/03/05
Posts: 10882
Loc: 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.
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#4751099 - 05/08/18 12:37 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
maxdustington Offline


Registered: 01/21/17
Posts: 393
Loc: Toronna
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.
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#4751117 - 05/08/18 12:53 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
oilpsi2high Offline


Registered: 12/18/14
Posts: 1300
Loc: 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.

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#4751127 - 05/08/18 01:03 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: maxdustington]
SHOZ Offline


Registered: 06/28/03
Posts: 5669
Loc: 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.
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2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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#4751130 - 05/08/18 01:08 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: Nick1994]
Donald Offline


Registered: 03/21/04
Posts: 20367
Loc: 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.
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#4751136 - 05/08/18 01:17 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: oilpsi2high]
bmwpowere36m3 Offline


Registered: 04/29/07
Posts: 642
Loc: 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...

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#4751142 - 05/08/18 01:21 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
CARJ Offline


Registered: 01/31/10
Posts: 85
Loc: Olathe, KS
Have you ever replaced your O2 sensors?
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#4751148 - 05/08/18 01:24 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
SirTanon Offline


Registered: 06/23/14
Posts: 2069
Loc: Phoenix, Arizona - USA
... or you could do what Scotty Kilmer says (I certainly wouldn't, but whatever), and do this:

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#4751198 - 05/08/18 02:23 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
MrHorspwer Offline


Registered: 12/18/06
Posts: 1418
Loc: Michigan
An appropriate retort to anything Scotty Kilmer says:


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#4751262 - 05/08/18 03:22 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
Trav Offline


Registered: 11/20/06
Posts: 18551
Loc: 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.
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#4751316 - 05/08/18 04:19 PM Re: Cleaning a cat. Or how to fix a P0420 code? [Re: SHOZ]
Smokescreen Offline


Registered: 05/25/05
Posts: 3328
Loc: Alberta, Canada
crackmeup MrHorspwer, that made my day !!!
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All with mpg > EPA

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