Code P0420 Catalyst Efficiency Below Threshold Bank 1. Emissions Test! NO PROBLEM!

If the P0420 code is combined with other codes it's always a good idea to fix them in order.
Your Catalytic Converter Should Never Have Failed. If It Did, Then You Have A PROBLEM!
To avoid catalytic converter problems, keep the engine up with regularly scheduled maintenance tune-ups and system maintenance per factory recommendations.
Professional Diagnostic OBD II Scanner
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STP Gas Treatment
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STP Fuel Injector Cleaner
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Cataclean
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Disclaimers: all opinions are my own, sponsors are acknowledged. Links in the description are typically affiliate links that let you help support the channel at no extra cost.
Possible causes:
A damaged or faulty oxygen sensor
Fuel injectors may be faulty
Fuel injector leaks
Spark plugs may be faulty
Improper ignition timing
Engine Control Module
Exhaust pipes damage
Catalytic converter itself
Oil or Antifreeze entering the exhaust system
Cat efficiency drops below 92%
Road Damage or Broken Hangers
Products and Technique I used To Pass Emissions Test
OBD-II Scan Tool
STP Gas Treatment
STP Fuel Injector Cleaner
Cataclean
Ran Engine at High Speed / High RPM's to Burn & Blow Carbon Build up out.
Took Car Right To Emission Test Station
MY CHOICE / NOW, WHAT'S YOURS? Please Subscribe, Like and Share my Videos.

[@magmade]

Congrats man... I just passed the emission test today at 4:30 pm, and I got the code at 8:00 pm...I guess I got lucky, now I got to save up some money and change it on my Altima.

[@daby8399]

Me too lol

[@alejandroamado4232]

Thanks man. I followed some of your stuff and my code went out. I added the gas treatment in a full gas tank. After getting in a 1/4 gas I added the cataclean drive it on the freeway for 15mnts, go to the gas station add the 91 premium gas drove home and puff check engine light code turn off. Thanks for you video.

[@girohead]

Turned off while driving? I had that happen once, it's pretty cool.

[@kiaora12]

$900 is good deal if it converts your Nissan into a Cadillac

[@MrLj29128]

Lol read my comment 🤦🏿‍♂️

[@438marcus]

😂😂😂😂😂😂😂😂😂😂😂😂😂

[@jeffm5148]

good one

[@Brosiph]

LOL

[@gloriapleiman3767]

🤣🤣🤣

[@marceldaniel673]

before changing the catalytic converter try and take out the sensor 2 that is after the catalytic converter and spraying it and cleaning it with break cleaner. The inside of the sensor had a part that was meant to be moving freely and mine was stuck with shoot. After cleaning the sensor P420 , the code disappeared and the car runs perfectly. I've done 100 miles and no problem. My car is a Toyota Avensis 1.8 petrol 1zzfe engine with 159k miles on the clock

[@jonmo2694]

Gumout worked on my 05 grand prix 130,000 miles, the check engine light was on for years till I bought a code reader this year. However I changed spark plugs as well, it did have a ETC sensor code as well, I may change it out with a coolant flush

[@josepuente6431]

Any update on sensor you cleaned?

[@squirrelcovers6340]

NEVER use a dealership for parts or labor. They are straight up THIEVES.

[@TOWNCARBUBBA87]

well said 👍

[@offgridcarnivore]

This is the only video I should have watched on the subject. Doing the same as you fixed my problem thank you

[@vin9114]

Check for exhaust leaks at the catalytic converter connections and O2 sensor. Even a small leak will throw a code. The leak will draw in air...(oxygen)

[@jamepearson]

I know I am 8 years late, but way to go, and congratulation sir. My car just generated that code, being 2 months until my emissions are due. I am keeping a positive mindset that I too will find favor of clearing this code, passing emissions, and keep it moving.

[@Mike_The_Hog_A_Nator]

Got my $20 OEM 02 sensor for bank 1 off Amazon for my 02' Blazer ZR2 & it corrected my issue. I Bought a FlowMaster Cat for $120 last year, 2021 from my local AutoZone. $50 bucks cut & installed 🤟

[@Sam-nt4sq]

Which o2 sensor worked for you?

[@smokey281]

@@Sam-nt4sq bank 1 is upstream, bank 2 is after the cat downstream to my understanding.

[@octavianoramirez4918]

Very good video.i like the way..you try to fix the catalyst converter .good tech tip man thank you ..well done..

[@rodneycunningham3509]

06 Roush PO402 Error code .Cleared error code.Added STP fuel Injection Cleaner system cleaner and STP gas treatment on full tank of gas.At 1/4 tank, added Cataclean,drove 15 miles and filled tank with supreme gas and passed emissions test.Please try this method before you go and spend 1000's of dollars!Thank You for this video !

[@girohead]

I don't see how higher octane fuel helps anything, just another myth.

[@DonaldDewJr]

What's ridiculous is how you have 8 ads

[@EyeGlue]

Ads absolutely KILL this information -- couldn't get to the half-way mark before resentment and irritation made me click out! The information is CATALYTIC -- the annoying and irrelevant ads are PARASITIC....but KZbin doesn't care, they are simply upping the irritation factor ahead of introducing an ad-free "experience" for a "minimal" monthly fee (Netflix style).....They have nothing to lose....not even customers!! If KZbin's audience of billions obstinately refuses to pay an ad-free subscription every month, they simply remain the measurable audience "eyeballs" that justify the airtime rates KZbin charges to advertisers......What say you, KZbin?

[@kennethterrell1167]

I saw no ads at all, but then again, I pay $8 a month...

[@mikejwomack9597]

Either that or your pay. That is how ad revenue works my man.

[@Aryck143]

KZbin Premium for the win

[@XellosMetallium]

Brave Browser will rid KZbin ads and more. A few months ago Crunchyroll let users watch for free but they had ads every 4 minutes unless you watching with Brave Browser.

[@gregsheffield7586]

Bank 1 Sensor 1 is upstream and generally the closest one to the exhaust manifold and easiest to get to. Takes 2 minutes to change on most and $35 for a single. Dealerships want $300.

[@gregsheffield7586]

$35 for O2 sensor. Catalytic converter on an Acura or a Honda should last 300,000 miles. Anytime I’ve gotten a P0420 code and have changed the bank 102 sensor, I’ve never had a problem after doing that. Changed my last one over a year ago and zero issues.

[@shawnditty8517]

@@gregsheffield7586 i have an 2013 acura tl right after i put in gas from a local gas station i got the P420 code Do you recommend I change that sensor?

[@TechSignn]

Where is the bank 1 sensor exactly ? Do you mean is on front of the car engine ?

[@user-ez8nw6ik8e]

I just found the bank 1 sensor for $40

[@KeystoneTexan]

I tried lacquer thinner and it worked for about 6 months

[@lstruggy]

I just replaced my “jeepalatic converter” last week costed me $1100 from O’Reilly then purchased 4 brand new Bosch sensors as well $40 each then paid $300 to install everything from Meineke good as brand new check engine light disappeared btw also replaced a cracked radiator ($600) now I’m eating cuponoodles for the whole month 🥳 2007 Jeep Grand Cherokee Laredo 170K

[@8754roberto]

🤣👍

[@sicmurodik485]

Jajaja

[@derrontaylor4061]

You could have bought another whole ass jeep for that price dude... dafuq lol

[@lstruggy]

Derron Taylor hahaaaa could’ve should’ve but didn’t she just hit has 181K original freeway miles never seen dirt snow mud garage kept & completely rust free well maintained top to bottom planning on keeping her till I hit 990K miles it’s all good I ain’t tripping over that she’s a keeper now 😂

[@dannymartinez8522]

Dam same price as the SUV worth

[@robertwhalley4266]

Dude, you do not need to go 110. Put it in low. Get the same blow out at 40. Think about it.

[@formerice]

I believe the Cats on my 2005 Subaru are around $3000. 2 new front O2's and Cataclean have finally cleared the CEL. MPG's have improved as well. 150,000 miles.

[@philipcooper4375]

My Xterra has been giving that code for 5 years and I just ignore it since it has been running fine with no hesitation or decreased fuel mileage the whole time, when it starts causing a real problem I will clean them out with rebar and a piece of electrical tape for the light it works great every time 😄

[@pwrtv9605]

I pissed in the gas tank. The engine light turned off. Must be the ammonia.

[@hgh5762]

Lmfao!

[@poolbob8776]

Maybe all the alcohol you had last night 🤔

[@timzauto]

That's funny as shit,lol.

[@javiermiranda1751]

Savage 😝😂

[@damonalston2317]

🤣🤣🤣

[@elizabethbarrientos4071]

This worked with my 2005 Hyundai Tucson! I used the STP gas treatment and STP complete fuel system cleaner plus adding 93 (highest available) gas. I drove normally after filling tank and after about 1/4 tank gone the light turned off!!!

[@superduperboyx]

how many bottles of the STP Gas treatment and STP fuel system cleaner did it take? How many tanks of gas?

[@dannymartinez8522]

But for how long

[@Eye-it-azz]

@@dannymartinez8522 The important thing is to pass inspection, those codes mean nothing

[@dannymartinez8522]

@@Eye-it-azz oh really

[@PLATINUM2U]

I hate when ppl say Cadillac converter lol.. Its CATALYTIC CONVERTER LOL

[@johnoktavec]

Me too, and they've lived in America all of their lives.

[@purplelover219]

yep - cat-a-LIT-ick

[@tonythomas4580]

my caddy has a Cadillac converter

[@buffdiggy]

It's a catastrophic converter on your wallet.

[@thegeorge50]

Hahaha yeah for some reason it felt like someone runninf their nails thru a chalkboard everytime he said it...not picking on the guy...it just bothered me for.some reason lol ppl

[@TOLDUSO4EVS7676]

Great job thanks for all the info.

[@EivinSukoi]

Don't worry how people pronounce words , focus on learning . You did a great job sir , don't mind the losers , who focus on unimportant shit . Funny I got the same obd reader , I just bought it . Good luck amigo .

[@flaviodelao3759]

Dealing with the same code, on a 2017 Pathfinder. Any updates on your cadalladic converter. Did this treatment fix it for good?

[@MySweetParadigm]

I got this on my 2014 jeep patriot and autozone suggested catacleaner. Put in half tank, drove 20min around 50 to 65mph and engine light is still on. No performance issues or power loss. I haven't noticed any leaks. Light came on today but not last night when I drove down the street.

[@abijah2478]

Could be your O2 sensors. Possibly one but if so best to replace both.

[@RockYouVideos]

Them darn cadaladdic converters. Haha

[@JinzoBruhh]

😂😂

[@rdaleyj1]

😂😂

[@Pr0j3ctSTI]

Did you mix the injector cleaner and the gas cleaner together????? If so is that even safe to do????

[@augustinelark9638]

Talked to a few muffler mechanics today that told me that's a failing catalytic converter problem, even though I strongly suggested it's an o2 sensor problem like the KZbin videos say.

[@deandreissadasf460]

it can be both, its just a code, i just installed a high flow cat, put brand new 02 sensors on it down and up stream and it’s throwing the code at me, and for others its actually because there cat is broken

[@savannahdavid9302]

"I can see it going out on a Chevy" As I sit in my Chevy Cruze with 104k miles wondering why P0420 popped up. Damn it. Guess that's that. Thanks for the help!

[@lakemalawifishkeeping2599]

Try cadi clean $26 pepboys

[@waspcosm1c901]

131,000 impala ss but it might be cause we put 87 octane but it’s recommended 91

[@ratagris21]

You can use Liqi Moly jector cleaner is good fuel injector cleaner. Just follow the directions.

[@Really2u]

The cadillac man! Way to go stud.

[@Reyrey603]

When u added the cataclean, did you refill the gas tank to full ?

[@TheVortech11]

Excellent information.👍

[@doublej4077]

Do you know you have seven commercials placed just so many minutes apart in order to watch your whole 13 minute vid ! That is the most I've ever seen . However I did glean info a product called "CatClean" to add to your gas and clean the catalytic converter. Thanks...I will give it a try. So far I have seen fixes for this code with O2 sensor extensions, replacing the gaskets on your plastic intake , or gasket change in the exhaust.

[@riveracarlos328]

you can reset set code by resetting ECU by either disconnecting negative battery terminal or the correct fuses. I tried to clear with my SCT Xcal tuner but couldn't so i pulled fuses.

[@richardjimenez7394]

I have the same problem my Suzuki Grand Vitra doesn’t pass smog test? Jet fuel clean out the catalyst muffler?

[@richardjimenez7394]

Thanks, I am going to try it for my 2004 Silverado truck and 2000 Grand Vitra Suzuki that’s the problem I am having, 430 code .

[@1ruckus1]

Did it work for the silverado?

[@garrettvining5953]

North Carolina carries 103 octane at raceway fuel station

[@michaelelliott289]

Ha, ha, you must have used Everclear. Anyway, I think someone else on you tube said try a few simple things first. Clean the battery terminals, replace the spark plugs, pcv, and what I would do is use an injector cleaner, too. Love the Catalytic video.

[@javierosorio2044]

jaden75 ?

[@clearenergy1]

How about Toyotalytic converter is it expensive to fix?

[@kofiboateng1241]

@Rc Jr thanks for sharing. I have the same issue with my Nissan 2005 Altima v6. It wouldn't pass inspection in the state of Maryland. My questions is, do I run the Cata-clean solution & StP cleaner at the same time? and how much gas needs to be in the gas tank b4 adding all those cleansers above? Also do I run all the cleaning solution on my way to conduct the inspection or what? Btw I have been running premium gas in my car for the past 17years since I owned it. Thank you Sir!

[@dasg5805]

Curious if/when the issue came back after using these additives

[@LuisHernandez-rk2tp]

I also get that code for my 2011 camaro. Comes and goes. Sometimes I dont see it for the months and I passed smog before.

[@Seeking_Truth9]

Hey will this work on my 2008 Toyota Camry with P0420 and P0351 codes in order to pass the emissions test?

[@spalkin]

Is the Catalladic Converter below the Counsel? I've got this same code.

[@Tom-ro1qn]

Yes, I had the same. Previous owner drove the car to slow. I Didn't use any products. Just pushed the engine to its limits a bunch of times on a steep long climb up hill accelerating. High Rev and high turbo charge so exhaust downstream is the highest. P0420 was gone. It's funny besides here nowhere else it's suggested

[@bobbymonroy5054]

Hello RC Jr. I like the video but I’m still getting the code of p02423 on my 2006 toyota Camry 2.4 L and I change the sensor on the down stream. What do you think the problem is thanks

[@keithwhisman]

I finally replaced my sensors(pre and post), PCV valve, Catalytic Converter, air filter, spark plugs and cleared the code and even cleared the trims with no success. It's a 2002 Camry. Rebuilt the engine and head. Still getting P0420. Blew head gasket and valve seals so had to tear the engine completely apart.

[@EmoAngelFuentes]

PCV valve fixed it for me…. No wonder I was burning oil. Good luck on your journey

[@jamesbroomfield7799]

Did you ever figure out how to fix

[@keithwhisman]

@@jamesbroomfield7799 sold the car.

[@honestscentz9300]

I had the same code for my 2008 Honda Civic 166,000 miles po420 I took steps first I changed my air filter , spark plugs and both o2 sensors remember changing the Catalytic converter is the last Decision now I have 193,000 miles now no check engine at all just a Tpms light

[@masonxtentacion9093]

so you never changed he catalytic converter?

[@honestscentz9300]

@@masonxtentacion9093 I never changed it I do 207 miles a day Monday to Friday I recently had to changed the spark plugs and the coils oem I used 93 graded gas now fuel system cleaner every week and ow 20 mobile 1 oil every 5,000 miles I'm currently at 273,177 miles the more you drive that's what cleans the catalyst

[@vulkandeathgrip5568]

@@honestscentz9300 My 07 Honda accord had aftermarket Cat installed and now the OBD II sensor says my sensor “Bank 1” air/fuel ratio is what’s causing check engine light and nothing else was detected what so ever. Is it possible that all I need is a new sensor for bank 1 ? And does is it need to be OEM sensor ? I believe the OEM for my Honda accord is “Denso” and also does the sensor for “Bank 2” also have to be OEM denso brand ? They replaced the “Bank 2” sensor since they stole my entire CAT and almost the entire exhaust system and I’m wondering if the bank 2 sensor is aftermarket and somehow confusing the car and causing the Bank 1 sensor to mess up. I really need help bad with this because I can’t find any used cars at all what so ever In the $8,000 price range that have less than 120,000 miles with good gas mileage and all I can find all over Northern California is the stupid ass “09’ Toyota Yaris” in my price range that’s decent on gas and I do not like anything about that car so I really need help whoever reads this message and what I should do ? Will the aftermarket CAT pass smog if I have OEM sensors in bank 1&2 ? Or is it possible the CAT itself even with brand new OEM sensors still fail smog if I replace the sensors with Denso brand OEM ? Please help haha 😂 I have 178K miles on my Honda and it runs amazing even with the issue I have rn… not a single issue besides this problem. What should I do y’all ? Thank you! I have the PO420 code and says Bank 1 sensor. When they put bank 2 sensor on the new aftermarket cat I wasn’t told if it is aftermarket sensor or OEM either. Do I need to replace both with brand new denso OEM ? And even if I do will it pass smog even with the aftermarket CAT ? I don’t wanna have to buy a new car or a new cat..

[@daintreejd5970]

INC is incomplete meaning it needs to pass a full drive cycle meaning that the light won't come on or remain off (if it is ok) until the drive cycle is compete. I'm guessing that the light came on after the drive cycle was complete.

[@TheMuzikall]

The list of probalities are too many bcos most of these electronic parts has to be Original Manufacturer Parts and they are not cheap..depending on make and model...Oxygen Sensor..some card have 4...Cat..very expensive..Injectors..not cheap....if its not a genuine part...EML will stay on....or go off but your car won't run right....my mechanic put Bosch platinum on my Lexus..car won't run right😥..he said my coils were faulty..New coils..car won't run right...New injectors...I refused...during our argument he swore he put new Bosch platinum. ..told him to replace them with NGK iridium. .Bang..lights clear ..car starts running perfectly...Mechanic said he was trying to save me money hence the Bosch plugs.. so just beware with electrical/Ignition /emission components. .

[@nickperez1522]

Can these codes cause your car to drive like there's bad gas in it and drive like you're going over bumps

[@michaelrs8010]

Glad you passed, but FYI; In California, and I don't know what all other states as well, having the Catalyst monitor registering as INC (incomplete) will not allow you to pass smog.

[@ThomasFromTN]

That's true, if your car is 2000 model year or newer.

[@vulkandeathgrip5568]

What does that mean ?

[@michaelrs8010]

@@vulkandeathgrip5568 that means you don't pass the smog test and you cannot register your car until you have whatever reason the catalytic monitor is reading incomplete is fixed. In California the only smog system monitor they allow you to read as incomple or not ready is the Evap (evaporation) monitor

[@vulkandeathgrip5568]

@@michaelrs8010 I know it won’t pass smog because engine light. Just need to know if it’s a sensor issue as it states bank 1 sensor with OBD2 or if it’s because the aftermarket federal catalytic converter somehow even though that seems odd it would be the brand new federal converter… the bank 2 sensor directly on the cat itself is new as well but I don’t know if it’s OEM or some generic brand. The front sensor (Bank 1) under the hood has been there for 178 thousand miles never replaced and that’s what the OBD2 is popping up as P0420 code Bank 1. So I’m not sure what to do first to attempt to fix the issue… could be that it’s very old ? 178k never replaced or maybe the bank2 sensor is too generic for my car along with old bank 1 sensor causing the error code to happen. Not sure

[@michaelrs8010]

@@vulkandeathgrip5568 well yeah that is always tough too diagnose. First thing you need to do is make sure the Upstream one is the right sensor is that a mass air flow sensor or a heated oxygen sensor. Once you have the right type of sensor for sure it really should not matter if it's a aftermarket brand or not... unless it's a brand that has a reputation for being defective. But yeah if it's showing you a certain bank that is the problem and you have an older sensor there you might as well replace that. Also it's possible you might have a leak somewhere along the system. Way too many possibilities to diagnose in the comment section

[@jlafay2000]

downshift so you can keep the rpm's up and not have to drive 110.

[@dakkoday3694]

Did you check your Blinker Fluid? I checked mine and drained it, then Bamm!!! got rid of the Cadillac Problem.

[@KennethT32505]

Make sure to fill it back with synthetic so the code won't come back.

[@jasonmai2528]

Dakk O'day what is blinker fluid

[@MonieGramz]

It's the fluid that lubes the pistons in the Cadillac converter

[@nissanneal]

How does this vehicle pass when cat monitor says INC incomplete? When the catalyst monitor switches to complete your light will come back on and you will be right back where you started!

[@JackArse32]

obd II requires a certain amount of cycles. before the emissions will even register, it'll go thru the cycles to start first. so by the time he took it in, it had done the cycles and the light had not come back on. emissions would register good tho

[@MichaelBrown-um8qc]

Hi , thee best fuel additive is the rislone !! "FACT" please try two bottles ,two full tanks !! Or even three. Change your spark plugs before doing the cat . The 91 & 93 octain do not have ethonal . It ,oct 28-21 . Likely to late for you?? Good luck !

[@dougjstl1]

There's a special cat cleaner that you can use I guess you could take it off and put some cleaner in it and then also if you drive it kind of hard on the highway. I'll heat up the cat converter to clean it and also the the catalytic converter what controls the flow is the O2 sensor so you can use the catalytic cleaner or cat cleaner but usually O2 sensors one of the parts on the car that goes bad and you can shop around and find a cheap one or even get a good one at the junkyard probably I've done that before

[@Timetryp]

I tried lacquer thinner, but it didn't work.

[@coldcoilinc]

Of course it didnt

[@salort2934]

Buy everything at Ebay. I bought my catalitic converter for 80 dollars, an my brother sold the old one to the recycler for 60 dollars. Iend up paying 20 dollars for the catalitic, and it worked.

[@JunkRemoverAnt]

I have a 5.7 grand Cherokee reading this code, should i let my gas go low before i pour those in the car? Or will it be fine with a full tank?

[@tom.dinger1823]

Listen everyone….. before anyone freaks out about the PO420 code, always check your O2 sensors, if your O2 sensors are bad it will trick the system of your car to make it think that it’s your Catalytic converter going bad. I had a PO420 code on my 2007 Chevy Malibu and i just replaced the sensors and boom CODE GONE!

[@Drizzy012]

If it were to be your O2 sensors that were bad, why wouldn’t it trigger a code?

[@thesportsjunkie4827]

Thanks for the advice. Got the same code so Im going with step 1 o2 sensors first!

[@scshit7748]

Fuck bro thank you, my uncle just told me the same thing and I was over here getting worked up. I have the same ride as you 2007 Chevy Malibu

[@GO-wb1gf]

I just input both new sensors in my car and it didn't work unfortunately

[@JB91710]

@@GO-wb1gf It only works if that's the problem.

[@kennydiel4797]

Got a 2005 MDX 1200 for converters 1100 in labor not sure on sensors

[@bobbymiller8563]

I have a 2014 Chevy Cruze with 1.4L engine it has 180,000 mile. I have been getting a P0420 code. I would go away and come back. I fixed it just by disconnecting the Negative side on the battery 1st. Now find the computer it’s on the side where the battery is. It’s has 3 connectors on it. I disconnected all 3 connectors and cleaned each side male and female connector with CRC 05103 QD Electronic Cleaner. Let it dry 15 minutes. I plugged all 3 back in. I installed negative battery cable. I started and drove the car 50 miles. It never came back.

[@mrb19741]

You'll probably need something stronger than dishwashing soap to clean it. There are a lot of videos on it. Good luck, and I'm not in the habit of subscribing to vids loaded with commercials. I'm trying 93 petrol to see if it helps.

[@erikamcdonald850]

The lacquer thinner worked for me

[@Tate.TopG.]

How do you use it? Soak the cat or pour it into the gas tank?

[@VickyGeagan]

If you have an old ford with a straight 6 it could be a bad fuel pump, also a Maf sensor and a couple of other things

[@robertthegeek]

For the Catalytic Convert this for bank 1 rear Catalytic Converter does it matter if it is an AWD or FWD Catalytic Converter

[@superduperboyx]

Question for your 2 STP bottles. Did you use 1 each for each TANK of gas first, or both at the same time in a full tank? What was your process with those 2 bottles ? I ordered the Cataclean and its on its way ..

[@rogerlee7583]

people have this channels but they never answer our questions like wth

[@superduperboyx]

@@rogerlee7583 yup it's annoying but it turned out it didn't work anyway. I ended up just replacing the cat myself, passed smog with flying colors. Cost about 2k just for both cats itself. I can't imagine how much it'd be to pay someone to do it. Maybe 3k-4k.

[@rogerlee7583]

Depending on where u live and what kind of car that u have; good luck my friend

[@Kalion415]

So he finally replies just to say this video didn't work had to buy new cat smh lol

[@rogerlee7583]

@@Kalion415 are u serious? What a loser lmao

[@MovesLikeJunior]

How were you able to get a smog with MIL Status OFF??

[@xxdaemonarchxx3436]

What kind of Cadillac converter you getting? Continental? Escalade?

[@JackMoveShawty]

I got that same code but I'm going to the fuel cleaners first. I did the CRC Guarantee pass emissions, I'll do the fuel cleaners that you suggested because I already have a bottle of cataclean.. I'm just wondering if I can run all of them at the same time or do one after the other. If that doesn't work, I'll change my o2 sensors before I buy a catalytic converter. I have to take an emissions test this week so I'm hoping things go great🤞🏾

[@nicolasdominguez6624]

Did the CRC Guarantee work? I’m debating between trying that and cataclean

[@cookiegaming1013]

Have the p0420. To just pass smog .empty the gas tank if y put regular gas.i put chevron supreme.i drove the car in the freeway in like 35 min.in the morning befor i start up the car i disconnected the battery for like few minutes i hook it up again. Start up the car.check engine is gone temporary.hope this will help

[@alcerz984]

A catalatic converter is new to me. But I’ll try to look for one. Wish me luck.

[@ianodoherty616]

how did u sort it

[@rickhunt3183]

A Cadillac converter is a person that pimps out a olds electra 225.

[@kennethterrell1167]

Lol!

[@philwittke2983]

Buick Electra,Olds 98

[@dialog420]

yup cadillatic converter is made out of palladium

[@darthmaul2945]

Haahaa

[@n300zx931]

dialog420 damn beat me too it

[@carlosv4439]

LOL

[@mbjasondify]

..and rhodium and platinum

[@MrJohnnyDistortion]

An Advance Auto employee told me that there was depleted Uranium in a Cadillatic converter. LOL

[@valentinak1783]

I couldn't find CADDILAC converter on my vehicle between two muffler bearings and a turn signal blinker fluid reservoir, what Am I missing ???

[@bryantwalley]

Its not between the two muffler bearings. Its on the other side of the blinker fluid reservoir. But while you working on that caddilac converter you may as well change out them muffler bearing. You already got them out and you wouldn't want to have to do it again later.

[@sarabailey-la2022]

Im running around in LA LA land !! Bloody hell to dam expensive !!! :)

[@johnnycool7541]

Here in NC you can get 110 octane at the pump

[@1drmr3]

Ive had this code a few times on my honda prelude and i was told it comes on when my engine is running rich due to an evap sensor leak ive also had on and the rich condition melts the cat eventually

[@speakinfreely1999]

wow all that money that is some BS man good thing you found a way around it man because that is BS they want to charge for any little thing! Im having trouble with the same thing for my car man its a Nissan Altima 07 same thing but my car actually feels like if its below threshold idk would you know what i can do instead of spending money on things that i don't really need.

[@raymondray3232]

I watched the whole video, what did you do?

[@YoungShizzie]

So listen I bought a 2004 Honda accord ex and has the code p420 they put a universal cat on it I bought a new one for 140$ and got the whole exhaust changed did it fix the code no it came back and I changed the sensors the code came back a month later and now after all that I got the high octane gas thing and it went away and been away for 5 days but I think my ecm needs to be updated or a exhaust leak

[@faust1639]

Cataclean didn't work for me the check engine light is still on but it was the first time in my truck sure did fix the lean gas and made my truck waste way less gas big time. It must cleaned the fuel injectors or something

[@mckoylach1622]

What is the proper way to fix this P0420 code, to have the system works effectively as it should?

[@lstruggy]

Buy a whole brand new “Cadillatic Converter” and brand new sensors and pay $300-$400 labor to install it new as a baby!

[@fettieteam2333]

O2 sensors.. I’m sure you can have one incomplete monitor, some places 2. It’ll come back on once the monitor completes

[@user-gq6vh8gr8m]

Mine just popped up on my infinity g35 . Should i replace the 02 sensors as well ?

[@steffNn]

Hey, I had the same code on my 04 4Runner and I filled up the tank with 93 like 3 times and I did reset the check engine after I filled up the tank the first time - the check engine came back with the same code, I kept putting high octane in the tank and reset the light one more time and it didn't come back, it's been 150 miles, not sure if that's enough driving to reset the cycle.. I am still driving with 7 gallons of vinegar in my car, in case the code comes back, so I can wash the cats lol. Will see.

[@daniel022209]

This is why its beneficial to get your own mechanic. Dealers mark up prices on product and repair because they have SO MUCH freaking overhead. Im surprised that even the owners dont see this as ridiculous as we do. They will charge you over $300 just to lift up the car, unplug and unscrew a faulty O2 sensor just to put one in smh.

[@yourguardian2215]

If everyone complains about it being too expensive why do many go there anyways instead of doing it them selves

[@zacharypeery4082]

DIY

[@jaygames1980]

More about rpm than speed you can cruise with your rpm higher and that will heat up the catalyst very well.

[@monsterq6]

Just wanted to say I had the same issue, threw in injector cleaner, cataclean, and some fuel additive and 91 octane, I fucking passed. 2008 Nissan Sentra 140k miles. also drove hard and fast for a long time before the test. Good advice!

[@RcJrTech]

Nice. that gives you a couple more years now.

[@theduckrc211v4]

Did you went to emissions test when you still had the additives in the gas tank ?

[@b57ecv]

its easy to fix and stop the engine management light coming on, it's because the cat is starting to break up and block the exhaust system causing an over rich mixture thats detected by the downstream landa , one of the best ways to fix the engine light problem is to simplify look down the exhaust or up into the manifold and see if it's blocked and running black over rich, if so smash out the blocked cat with a length of steel bar shoved down or up the exhaust system, will mean taking it apart, but you have to be careful not to damage any landa sensors in the process take them out as well if need be, once done disconnect the vehicle's battery to reset the engine management light that's if you don't have a reset tool, once all put back together the management light shouldn't come on and the vehicle will run properly again as an over rich mixture can cause very poor running, to get it through emissions testing next test go become friends with your local garage and bribe them to use another vehicle to stuff the tester up, everybody dose it here in Britain and if you've got the problem you haven't got much to loose by doing this or it's off to the dealership and loose shed loads of money, and the really funny thing is they run better and use less fuel once the cat is gone.

[@rezaade5428]

hi guys, i need your help..my car has detected P0420..but this catalytic converter already broken..and than i remove this CC i change downpipe. this problem appear, Check Engine appear if i use car more than 150km.. Please help this solution, what if installing extender in sensor o2 can helping?

[@Foodrecipes0921]

Previous owner paid 1600 for the converter but code is still popping up. Why? Could it be an aftermarket part? I have a scanner and cleared the code but it keeps on coming back up?? What can I do to get rid of this code. PLEASE. 2003 Toyota Sienna

[@doglogisticsllc4447]

Did you have Sensor bank 1 checked

[@Sam72771]

Q? will this make your car spend more gasoline?

[@yodo6414]

Try using the parts store, why would anyone go to a dealer for parts???????

[@peterp4753]

Just change the gas station! I was going to the same gas station for 2 years by the name Raceway, and my catalytic converter failed, code PO420. For last 3 weeks I started to use BP gas station, and my engine light is gone. Better gasoline fixed my problem.

[@davidcobarruvias4185]

Did it really help

[@daby8399]

Yeah I'm in the same boat I just went to take my gas cap off I'm going to wait a little bit and then put it back on

[@macgyver6699]

I just got the light and code at 178000 but I believe it is dirty due to it eating oil from a faulty aftermarket valve cover and gasket