P0420 Lacquer Thinner didn’t work catalytic converter Catalyst efficiency Scotty Kilmer Test Fail

There's a reason there are 4+ million views for this on Scotty Kilmer's video. I tried this last night on my '99 VW GTI Vr6. One gallon thinner to just over half a tank of gas (about 8-9 gallons). Drove at highway speeds until the gas tank had a gallon left (Approximately 160 miles or so). Filled with high octane gas, which my car requires. The moment after the fill-up and starting the car back up, light came off. Much better vehicle performance as well. At about 108k miles. We'll see how long this lasts. I do know it cleaned the crap out of it.

Bad idea for me!, Pathfinder 2006 car was running great, no issues, but didn't pass smog due to catalytic converters... half tank of gas, used 1 gl of thinner ran it 40miles, after that...had to replace the injectors, damaged 2 coils, had to replace the spark plugs, which were new, all the dirt got stuck on th catalytic converters and when take them off they were all broken and the inside apart, guess my car was really dirt on the inside. The car failed so bad that an ice cream dealer on foot would beat me :(

Worked for me... I added lacquer thinner the same week the light came on and it absolutely worked. Obviously not everyone will get the same result, because there are just too many variables. Age, mileage, the amount of dirt, corrosion levels, tank size, etc. There are too many people that have successfully used this method to get rid of a p0420 code to simply claim it doesn't work. Crud, or build up from corrosion, is not the only reason a car will throw a p0420/30. In my case it was likely the cat was in good condition just excessively dirty.
I feel like you are frustrated that it didn't work for you, which is understandable, but I think people should still try it for themselves...
It's worth mentioning that it also worked for a friend of mine, but he had to do it twice. The first time only killed the code for a few hours.

It worked for everyone else but you 🤔 oh ok

It works ...it worked on my 2009 corolla and now it runs like a brand new car and milage is near as a new car ...
Thanks sccoty killmer

maybe I'm wrong but i understood that it would help clean it not fix it, and if that didn't work you could try taking it out and cleaning with soap and water the point of using the lacquer in tank was to possibly clean it without having to take it off of course that's after you rule out all other things first and before buying a new one

I have seen several videos with audi cars and one is yours and one was cataclean and both videos suggest these additives didn't work.

clean it please, i’m curious

You can get a spark plug oil fouler spacer from the auto parts store and put it on the end of your output 02 sensor, that will clear your code and keep it from coming back on. The package comes with 2 of them, so use both together it works the best, and will keep your fault code from coming back on.

Trying now on my 2000 ford Explorer crossing fingers!

The lacquer thinner clean will only work if you have a dirty cat being the problem. If it’s the oxygen censor then you have to address that.

If we went with the hydrogen car we wouldn’t need catalytic converter‘s

Stop talking about it and do it. This is the second video of yours that wasted my time talking instead of doing. People want to see results, not talkers, repeating the same questions and not showing end results.

Use more idiot. I think your lieing. Your never gonna have Scotti numbers on you tube.

YES

PLEASE do it! Clean the Catalytic Converter.

FOR SCIENCE....

It only cleans dirty clogged cats, it won’t fix broken apart or burned out cats.
This guy has a attitude…

Scotty said to soak it in laundry detergent overnight. and the catalytic was completely blocked

yawn

It might be an exhaust leak CATACLEAN worked for me

I performed this on my Nissan Frontier 2011 with P0430 Cat Bank 2
Didnt work for me and my State Inspection due this month. New Cat is $1000 😒

The Lacquer Thinner worked on my 2006 Nissan Pathfinder. I had the PO430 code. Scotty was right in my case. I must just have had a slight amount of carbon build up.

It seems there are way to many reports from a wide variety of sources saying that it did work for them, that we cannot conclude it just doesn't work. Most likely the truth is there are a lot of reasons why an emissions system can fail, and this method only works in certain cases. I have been looking a lot and from all the reports I can see it seems to work more than half the time. So no guarantees, but for such a low cost it is certainly worth a try.
My biggest concern was if it could cause other problems, and while it doesn't work in every case, I could not find a single instance where it caused a problem so...

If a vehicle is burning oil or dumping excessive fuel, the cat won't operate the way it's supposed to and sensors throw the code. A cat that is melted or broken inside can't be cleaned to return to new condition. ....The cat in this vehicle is physically broken ("a few chunks missing), so no cleaning technique can "make it better".

First of all.....inside Scotty Kilmers vid, there are literally hundreds of testimonials that it DID work. Remember a few things....1.) Code PP420 could mean different things. If it indicates a long term fouling of the cat, then the lacquer thinner should work. If the code indicates somethong else that is not cat fouling related, then it won't work. Pretty simple. 2.) Scotty used a barrel of lacquer thinner and from the label it is JT 501. YOU used cheap Walmart Klean strip insterad. Not the same. Here's the difference in composition of the 2 products. JT501---> 50-75% toluene, 10-20% acetone. Klean Strip.... less than 5% toluene ( !!!), ....and then there is this. Even for the folks that found success in Scotty's vid, some needed multiple applications before they gained meaningful results.

Whole gallon did not work on my 2010 Odyssey, (215K). Had tried Guaranteed to Pass, Cataclean, Duralube, with only occasional and brief fixing. Yesterday, my brother said the new Risolone Cat Cleaner fixed his son's 215K Civic very quickly. I tried it in my Odyssey, followed directions exactly, worked after only 26 miles! Had it inspected right away....

Burned thinner may create some detergent effect on the catalitic material. we are not all chemist here. If you study organic chemistry, it can explain what s happening after this lacquer burned. People just tries and tries. If you are lucky and your cat converter is in early stage of dirt or burn, this can be a solution. But if you already had a bad injector and run the car for a while with that, unburnt gas burns inside the cat converter and it may harm the materials, or even broke it. Same thing with happens to charcoal if you burn it too much it breaks. Therefore, I don't think any cleaner works after hard burn. So we cannot say it works or it does not work totally. Or some people maybe have miss-fire and trying to get rid off the P0420. Whatever they put in the gas tank does not solve their issue, on the contrary this thinner can make it worse because of excessive heat on cats when it burned. Summarily, either any video says it works 100% definitely is not reliable for me or anyone says it does not work totally means they are not objective.

The trick worked on my ‘06 Chrysler Town & Country with 325,000 miles

Well read what's on catalytic converter cleaners. They have that in them along with mineral spirits and other solvents

Do you read the comments? I am sorry to say Scotty is probably much smarter than you. He also seems much nicer than you. I watched Scotty Kilmer for years. Again like Scotty and everyone else says, it doesn't work every time. Man, do you watch your videos? How do you have so many subscribers? You remind me of a bully who gets his butt kicked by the one you pick on. I think Scotty Kilmer is kicking your butt on here for supporters. Use logic and science, it take more than one time. By the way I don't see you as an expert in physics or chemistry. I agree with your skepticism, skepticism is a good thing to find truth. But if you hear this many testimonies it seems to me it confirms it works most times, it must work sometimes. This is very similar to the testimonies that Jesus rose from the dead, sometimes things don't make sense but they still happen. I see this to be much easier to believe and guess what I believe in Jesus because facts and data support he did. Some people will never to believe it's possible others have faith because there is enough evidence to believe, others will never believe even if there is evidence. Testimonies are evidence in science and most the time in court but not under this justice system that very corrupt.

When the thinner doesn’t work, you clean it in tide. Why would that be a waste of time?

Yada yada yada works for most of them. Good try.

Nothing will resurrect a cat if it too far gone. Sorry your cat is caput.

If your cat looked clean that means it was shot and not clogged. All the cleaners in the world wont help u.

You should. if it works to physically clean the cat it would help 1000s

I'm guessing lacquer thinner works because it contains acetone. So does cataclean. And from what I read on their web site, the combustion process turns acetone into another chemical in its exhaust vapor that cleans catalytic converters. But that would mean you'd have to make sure you're getting exactly the right brand of lacquer thinner to know that it has acetone and enough of it.

Most cat cleaners smell like lacquer thinner i swear.

You stated in your last video that you had bad coils. I guess is all that raw fuel going in to the catalytic converter ruined it causing the P0430. If the catalytic converter is inefficient due to soot the lacquer will definitely work.

I watch scotty and u daily🤣🤣🤣🤣

Dawn soap soak in a bucket .only clean the oil,ash only in the catalytic convertor.

lol there's no way that could bossibly work

Did you put the lacquer thinner in HALF tank or full tank?

Naptown why do u think it didnt work for you when so many people test to it ..u know audis Volkswagen almost all of them have internal over oil consumption misfires etc ..but curiuos to know u drove it at 2500 rpm at 150 m

Do you have a video diagnosing O2 sensors?

Just straight pipes 😂

I worked 30 years for "BASF/Engelhard," which invented the Tri-way catalytic converter in the 1960s and still makes 90% (every OEM catalyst) and refines 99% of the world's precious metals refined out of spent catalytic converters.
I dont claim to be an expert in anything...EXCEPT the catalyst that makes the honeycomb of each catalytic converter. We did not can them.
A bathe in dawn dish detergent will only remove the burnt oil. Most any acidic ( pH 6-6.5) chemical bathe will clean ceramic honeycomb tri-way catalytic converters. Such as Citric, nitric, hydrochloric, hydrofloric,, etc... The hotter the chemical bathe, the better. Soaking bathe duration will be less than 24 hours.
And , yes, slightly acidic (pH 6.5 or less) vapors of positively charged hydrocarbon vapors in exhaust caused by burning lacquer thinner and a catalytic converter temperature above 400 C for several hours will clean a converter that does not have a broken ceramic honeycomb and is not totally blocked. The hotter the cat, the better it will clean. The closer the cat is to the engine, the higher the temperature.
The precious metals will not, and cannot separate from the ceramic honeycomb unless the honeycomb is cracked and broken or if you use 100% hydrochloric acid oxidized with chlorine . The platinum, palladium, and rhodium (tri-way) is molecularly bonded with the ceramic. An acidic and heavily oxidized solution (pure Hcl acid and sodium chlorate, or sparged in chlorine at 70 Celsius) will dissolve 99.5% precious metals from ground and burned tri-way cats for metals reclamation. The ceramic is left as a solid residue and will not dissolve in Hcl acid and chlorine. Nor does ceramic burn off below 2500 degrees Celsius. The precious metals will not burn off at any temp. Unless you have a city size electric substation and a plasma electric arc furnace.

THE P0420 CODE SHOWS THAT THE CAT IS EXPERIENCING A PROBLEM, HOWEVER, ITS NOT AN INDICATION THAT ITS THE "CAUSE".... THE CAUSE , IN SOME CASES , ARE THE INJECTORS,, THEY COME IN DIRECT CONTACT WITH LIQUID LAQUER THINNER & CLEANS 'EM.... MY OPINION

Since you already took it off and havent yet try using lacquer thinner directly to clean maybe there is hope to your theory that it can still works, maybe alot of people is just curious as I am want to see if anything chsnge at all but im still supporting all best of your efforts. Great video!!! Keep it going!!!I'm looking to see more...

Got a Toyota Taco @ 230k with a P0420. I used a shop vacuum in the tailpipe and passed dawn dish soap and water through the oxygen sensor port. Once all the water was vacuumed through the tailpipe [yeah I know there's gonna be some water left in the muffler baffles.], I passed 12 ounces of acetone through it. Then drove it at 70MPH for 16 minutes. Catalytic temp reached 1400F precat and 1350 post cat. Cat monitor passed it with .78 efficiency; 2 points shy of failing. P0420 gone. It lasted only a couple days until I put regular fuel from Habibi's gas station. So I'm doing premium from now on.

Mr. Kilmer's method of using Lacquer thinner is simply increases the octane of the fuel. Lacquer thinner contains acetone and Toluene. The concentration of acetone in the gas tank isn't strong enough to damage plastic fuel pumps but is strong enough to clean fuel injectors. A small amount of Toluene leaves the combustion chamber and enters the cat and is able to clean it when the cat is at working temp. I'm still trying to figure out the cost effectiveness of using Scotty's method compared to just using premium gasoline and the Italian method of cleaning cats [driving fast enough to make the cat reach 1800F for at least 16 minutes]. I also have the idea of using an ounce of ATF fluid in the gas tank if premium gasoline is too expensive.

There's also another idea. The elements in the catalytic core not only contain platinum, it contains 25 grams of Cerium in the ceramic honeycomb. Cerium acts to grab onto oxygen in it's heated state. If the cat has a high temp oil covering it or if there is too much ash from the dried up antifreeze [e.g., from a leaky head gasket], it will not grab that oxygen and your downstream oxygen sensor will send a voltage signal pattern that makes the ECU think that the cat is not efficient. So if you plan on using soapy water to clean your catalytic converter, I suggest you boil your cat to clear out the antifreeze precipitates and other non-water soluble compounds such as silicone dioxide, a compound used in head gasket sealer.

I think that the excessive oil consumption overheats them and kills the reaction, I don’t believe it’s possible to fix with cleaning. Same when you have a stuck injector or flashing check engine light / misfires = extra fuel being burned up in the converter past what it can take doing permanent damage