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98 lesabre, o0420 code..some cleaning ideas! #4580035
11/20/17 11:53 AM
11/20/17 11:53 AM
Joined: Aug 2005
Posts: 1,546
stamford, CT
ziggy Offline OP
ziggy  Offline OP
Joined: Aug 2005
Posts: 1,546
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.

Last edited by ziggy; 11/20/17 11:54 AM.
Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580046
11/20/17 12:05 PM
11/20/17 12:05 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
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...


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580048
11/20/17 12:06 PM
11/20/17 12:06 PM
Joined: Dec 2014
Posts: 1,684
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,684
'murica
I honestly can't comprehend a lot of what you write.

Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580058
11/20/17 12:26 PM
11/20/17 12:26 PM
Joined: Sep 2015
Posts: 1,588
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,588
USA
"Cataclysm in a bottle" = malt liquor.
Not sure what "lawyer thinner" is, but I like the idea.

Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580079
11/20/17 12:58 PM
11/20/17 12:58 PM
Joined: Mar 2015
Posts: 5,393
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,393
Virginia
Get say ahhh 3 pounds of plastic explosive, a thousand feet of detonation cord, detonation initiator, and viola... Problem solved.

Last edited by bbhero; 11/20/17 12:59 PM.

Nissan Altima 3.5 Coupe
Mobil Super 5w30 Wix 57356
"Treat your family like your friends and treat your friends like your family."
Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580086
11/20/17 01:08 PM
11/20/17 01:08 PM
Joined: Nov 2016
Posts: 5
washington state
harrybosch Offline
harrybosch  Offline
Joined: Nov 2016
Posts: 5
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

Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: Ethan1] #4580105
11/20/17 01:41 PM
11/20/17 01:41 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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

Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580138
11/20/17 02:29 PM
11/20/17 02:29 PM
Joined: Sep 2009
Posts: 180
USA
zvm77us Offline
zvm77us  Offline
Joined: Sep 2009
Posts: 180
USA
your cat is most likely toast, below is your solution for emissions
https://zzperformance.com/3800/o2-emulator.html

Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: bbhero] #4580215
11/20/17 04:08 PM
11/20/17 04:08 PM
Joined: Sep 2015
Posts: 1,588
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,588
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.

Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580225
11/20/17 04:18 PM
11/20/17 04:18 PM
Joined: Sep 2004
Posts: 7,796
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,796
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.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580249
11/20/17 04:50 PM
11/20/17 04:50 PM
Joined: Feb 2011
Posts: 6,753
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,753
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.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: bbhero] #4580281
11/20/17 05:22 PM
11/20/17 05:22 PM
Joined: Mar 2015
Posts: 11,858
In the shop
53' Stude Offline
53' Stude  Offline
Joined: Mar 2015
Posts: 11,858
In the shop
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


09' Camry LE, 141,020 miles

PP 5w30 and TG 4967
Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580313
11/20/17 05:50 PM
11/20/17 05:50 PM
Joined: Nov 2011
Posts: 1,230
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,230
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.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580344
11/20/17 06:35 PM
11/20/17 06:35 PM
Joined: Dec 2013
Posts: 2,432
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,432
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.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: 98 lesabre, o0420 code..some cleaning ideas! [Re: ziggy] #4580424
11/20/17 07:26 PM
11/20/17 07:26 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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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