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#4580035 - 11/20/17 11:53 AM 98 lesabre, o0420 code..some cleaning ideas!
ziggy Offline


Registered: 08/08/05
Posts: 1491
Loc: stamford, CT
Hi again all! I replaced my upper plenum,gasket,lower gaskets.had a code p0420. Catalyst inefficient bank 1. Cell went off. About a week later,80 miles or so,cell came back on. P0420. Got 2 new oxygen sensors,as Delco brand,try too install tomorrow. Did some googling,and came across, carb cleaner sprayed in cat, !
Liquid kilt sucked through brake booster line, cataclysm in a bottle, distilled water sprayed through intake,and lawyer thinner,a gallon too half a tank. Think any of these are worth a shot? Figured since I'm gonna have the sensors out,spray car cleaner in, some distilled water,followed by the laque r thinner thing. Scotty kilmers thing.


Edited by ziggy (11/20/17 11:54 AM)

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#4580046 - 11/20/17 12:05 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
I've never heard of a widely accepted method to clean out a cat without gutting it - seems that once they're plugged, they're done.

With the right scanner you can watch your O2 voltage feeds to see if it's your sensors or the cat itself...
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#4580048 - 11/20/17 12:06 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
I honestly can't comprehend a lot of what you write.

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#4580058 - 11/20/17 12:26 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
mk378 Offline


Registered: 09/27/15
Posts: 1416
Loc: USA
"Cataclysm in a bottle" = malt liquor.
Not sure what "lawyer thinner" is, but I like the idea.

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#4580079 - 11/20/17 12:58 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
bbhero Online   content


Registered: 03/20/15
Posts: 4616
Loc: Virginia
Get say ahhh 3 pounds of plastic explosive, a thousand feet of detonation cord, detonation initiator, and viola... Problem solved.


Edited by bbhero (11/20/17 12:59 PM)
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#4580086 - 11/20/17 01:08 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
harrybosch Offline


Registered: 11/21/16
Posts: 5
Loc: washington state
I have a 1996 Toyota Tacoma with the 2.4 L engine. Bought it in 2006. After owning it for about 3 years, I got a check engine light (CEL). Read the code, it was P0420. Did some reading on the internet, found out that I could reset it by temporarily disconnecting the battery. As time went by I started to get the CEL more and more, was having to disconnect the battery twice a week. I waited until this past summer, on a day when the temperature was just right, in the mid 70's, and I replaced the catalytic converter (bought a Walker brand one from RockAuto, $103 with shipping). I was lucky, I only needed to remove 4 bolts and the cat fell out. I have 3000 miles on this cat now, no more CEL. I tried "Cataclean" in my gas tank, it did a good job of cleaning the injectors but still had the CEL come on

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#4580105 - 11/20/17 01:41 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: Ethan1]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: Ethan1
I honestly can't comprehend a lot of what you write.


I enjoy reading his posts. The "lawyer thinner" got me. LOL

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#4580138 - 11/20/17 02:29 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
zvm77us Offline


Registered: 09/01/09
Posts: 171
Loc: USA
your cat is most likely toast, below is your solution for emissions
https://zzperformance.com/3800/o2-emulator.html

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#4580215 - 11/20/17 04:08 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: bbhero]
mk378 Offline


Registered: 09/27/15
Posts: 1416
Loc: USA
Originally Posted By: bbhero
Get say ahhh 3 pounds of plastic explosive, a thousand feet of detonation cord, detonation initiator, and viola... Problem solved.

Fill up with E0 first.

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#4580225 - 11/20/17 04:18 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
andyd Offline


Registered: 09/25/04
Posts: 7139
Loc: Marshfield , MA
Register car in MA. Emissions void after 15 yrs. You can run it rich for a 50 miles, then lean and hot for a few hours In a lower gear to keep revs up at legal speeds.
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#4580249 - 11/20/17 04:50 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
LeakySeals Offline


Registered: 02/18/11
Posts: 6561
Loc: Hudson, NH
I would go with the $5 fix. Use a Dorman HELP spark plug nonfouler modded for the rear O2 sensor. It backs the rear O2 out of the exhaust flow a bit, which the ECU thinks is awesome catalyst efficiency. In a day or 2 poof, out goes the light for good. But remember, that oil burning will eventually plug the cat, and the car will choke and stall. And cause other various issues due to heavy oil consumption. And if you're fogging your cats with pale oil (AKA Seafoaming) don't. Plugs the cat even worse.
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#4580281 - 11/20/17 05:22 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: bbhero]
car51 Offline


Registered: 03/12/15
Posts: 10252
Loc: Southwest PA
Originally Posted By: bbhero
Get say ahhh 3 pounds of plastic explosive, a thousand feet of detonation cord, detonation initiator, and viola... Problem solved.


Thatís right Captain. Heck, throw a whole bottle of MMO in there for good measure smile
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#4580313 - 11/20/17 05:50 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
Audios Offline


Registered: 11/19/11
Posts: 884
Loc: Lyndhurst NJ
The coolant and oil that it was probably burning may still have left deposits on the cat, so after some time it may clear up on its own. You can do an O2 spacer as long as the cats not clogging. Ive also seen cat cleaner in a bottle as well. Ive had luck with a big bottle of techron, and doing the 50 miles or so in 4th gear at highway speeds, getting on it every now and then to try and get it really hot., and then immediatley going to inspection, but only bc in NJ we have to until the car is 25 years old. Not sure if you need it to pass anytime soon.
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#4580344 - 11/20/17 06:35 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
clinebarger Offline


Registered: 12/19/13
Posts: 1907
Loc: Fort Worth, Texas
P0420 95% of the time means the converter is BAD, It is very confusing to me for people to spend time & money on stuff that will not fix the car.
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#4580424 - 11/20/17 07:26 PM Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
ziggy - Do a backpressure test. You do that by unscrewing the upstream oxygen sensor and installing an exhaust backpressure gauge. Anything over 2-PSI is considered clogged. If it's not clogged, ignore the P0420 code unless you're trying to pass smog.

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