9 Solutions to Fix P0420 - Don't Start Fixing Before Watching This

[@girohead]

Very professional and absolutely thorough. I've been wrestling with P0420 for most of the year and found these ideas individually. It's nice to see them altogether in a very professional presentation. I'm finally ready to order a cat, but I called the manufacturer and he agreed that it was often not the cat - but I've looked at all these others already. So frustrating, mainly because my cat is welded inline so I can't even check it. Alldata points to bad cat, but I keep thinking it's something else.

[@nondainc]

Hello, we really appreciate your feedback. Hope it helps!

[@zozimoo]

name of detergent?

[@nondainc]

Hi Zoltán, you may head over to this link regarding your concern with the Detergent Soap: amzn.to/3sbMISV

[@zozimoo]

@@nondainc thx 😉

[@biimazin668]

O p08 of p please provide o o o p08 we p7 7

[@madeleyinc]

P0420 on my vehicle turned out to be a vacuum leak in a vacuum hose from the intake manifold.

[@TheWilferch]

Another possible reason for getting PO420 code that is not mentioned....an exhaust leak somewhere that screws up the "comparison" signal between the upstream and downstream O2 sensors.....causing them to say the cat is working below efficiency. One place to look beside obvious rust holes in the piping is the first flange gasket at the exhaust manifold. If this leaks, it screws up the readings and causes the code.

[@FordSkater]

lol you didn’t watch the whole video? Exhaust leaks are mentioned in the video.

[@chaseboy225]

Carbon build up in the engine can also trigger the code as I own a 2014 Jeep Grand Cherokee Laredo I used Seafoam Intake Cleaner and after it blew all the carbon out the check engine light turned off and never came back on

[@nondainc]

Hello, thanks for sharing your knowledge!

[@bowe1978]

My 2015 F150 5.0 did the oposite, after using Seafoam, then a month or so lader STP the engine lite came in middle of trip!

[@TryNSave]

@@bowe1978If it happened a month or so later then the fuel additives probably weren't the culprit.

[@Cajundaddydave]

Very thorough overview guys, thanks!

[@nondainc]

Hope it helps! Thank you for your feedback!

[@karlkunkle9233]

Really appreciate the video, very informative, but the background music caused me to end it early

[@ShootingAnalysis]

Very comprehensive diagnosis and solution! I ended paying the $16 bluetooth kit shipping though I already have an ODB2 scanner.

[@billyguadarrama5139]

Very helpful video 🙌. Appreciate the knowledge being passed on.

[@GOD999MODE]

How much will the dealership or a local garage charge for diagnostic and fix? Everytime I go to one with a check engine light, they are magically able to charge upwards of $1000 for a fix, no matter what the issue is.

[@FRLNCR]

Never use the spark plug gapper itself against the electrode to bend the ground tab as shown in this video. Could easily damage the electrode. Bend the ground tab from the back of it with a proper gap adjustment tool or carefully with needle nose pliers if the tool isn't available. Use a wire loop type feeler gauge on exotic metal plugs for proper gap setting to prevent damage. Most wire loop feeler gauges have a ground tab bender included.

[@benk1307]

Got a 2004 Toyota Highlander with p0420 code. Took it to a shop and they tested o2 sensors - both are good. But I have no symptoms of a bad cat other than the code itself.

[@nondainc]

Pls check the possible causes: Faulty Three-way Catalyst Converter Bank 1 Exhaust Tube Intake Air Leaks Faulty Oxygen (O2) Sensor Faulty Fuel Injector(s) Leaking Fuel Injector (s)

[@ShootingAnalysis]

My 2014 Ford Explorer Police Interceptor 3.7L was reading P0420 P0430, and also pending codes for them. Found hot air flow from a leaking gasket after the catalytic converter to the muffler. Replaced the gasket, weld the cracks between muffler and pipe. Codes are gone, waiting for sensors to be ready again.

[@ubaldogonzalez1747]

It is a great way to help me understand the P0420 on my Dodge. However, if you eliminate the music from the video the information will be projected much clearly.

[@nondainc]

Thank you for your feedback.

[@UrbanMaxxTV]

I like the music

[@happyjack8952]

The "music" , if you can call it that, is EXTREMELY annoying.

[@bksaun]

Your right, very annoying!

[@standhd]

@@happyjack8952so you obviously don’t have the brain capacity to relax and absorb the information with the music in the background. I found the music along with the vid EXTREMELY informative along with entertaining. Keep your BS to your self and get a life.

[@A.I.P519]

That’s a lot to think about

[@kingsbill8340]

Problem solved! Thank you!!

[@nondainc]

You are most welcome! Stay safe!

[@kaylencyprian717]

What u did? Plz?

[@cryptidsuntold]

which one worked??

[@rodmad6661]

Thank you for the great video and very specific checks for this issue. I have a 2009 chevy cobalt with a new cat converter but i keep getting the 0420 code. I have replaced everything but i have not tried the O2 spacer. Ill give it a shot and report back. Thanks!

[@nondainc]

Hope it helps, Rod!

[@rodmad6661]

@Str8blastn713 Htx south sorry bud this did not work for me. There isn't enough space between the oxygen sensor and the floor board. I was not able to out both foulers on.2009 chevy cobalt LS

[@Vellieveil_64]

@@nondaincwill I be able to pass emissions test with extender on o2 sensor?

[@mack10blue]

I have a 2007 nissan altima with 214k miles and it's showing the same code p0420 i haven't use the catalytic cleaner yet but i'm going to try that next to see if i can pass inspection. My code reader was throwing a bank 1 sensor not ready so hopefully this helps.

[@nondainc]

Thanks for watching, Nate! Hope it helps!

[@mikemclaughlin3306]

How does modifying the o2 sensor "fix" the problem?

[@nicolasdakota103]

Very useful video and absolutely professional made 👍 it.thank you

[@nondainc]

Thank you for your feedback, Nicolas!

[@cantbuyrespect]

A citric acid solution will make it like new. Cheap and effictive as long as the honeycomb isnt broken or melted.

[@notyourbusiness1352]

Oh wow. How do I do that? Put it in gas tank or wash the cat with it?

[@cantbuyrespect]

@@notyourbusiness1352 You boil the citric acid in water and soak the converter overnight.

[@GosWardHen98]

Enjoyable & really good informative video. Mine us showing the P0420 error, so its gping to be interesting. Thanks.

[@nondainc]

Thank you for your feedback! If there's no other code that register along with this code, we suggest following the tips/solutions provided in our video on how to fix this code. Hope this helps!

[@tcoopher3108]

Where should I buy my catalyst converter if I need one 2014 Buick encore

[@loiyalabbassi5846]

Changed the catalytic converter but still the check engine light is on , and my main problem the is shaking under the driver seat between speed of 10-40

[@kennethchong2813]

Engine Mounts lhs/rhs plus tranny/gearbox mounts

[@pointnemo8326]

I really enjoyed watching your videos, very useful. I have lexus is250 2009 and I can sense rotten eggs smell when I drive hard or speed up quickly. What are the problems?

[@nondainc]

Hello, thank you for your feedback! Can you please confirm if you are getting P0420 or any other codes?

[@hmdnat]

Great effort. Thanks a lot.

[@nondainc]

We appreciate your feedback!

[@ggb6957]

I have a 2017 Hyundai accent and it shows this code and a p0335. Sometimes it will crank with no issues, but there are times when I have to tap the gas pedal for it to start. Any idea of what it could be?

[@desertwaterdemon]

Just did the vacuum bubble test and found a leak on the catalytic converter. Might have to replace it?

[@mohamedbendaoui689]

Please, I have a 2004 Fiat Sienna car, and I have a problem with it. When I did the diagnosis, I got code p 1619. I want to know what this means, please.

[@nondainc]

Hi Mohamed, this code is triggered when oil pressure drops to the point where it can no longer operate the variable cylinder management system.

[@fazal1145]

i have toyota Corolla changed the 02 sensor but again engine light came with code P0420..PLZ ADVISE

[@raulvilla2825]

I have a 2003 Ford Mustang GT 4.6. Code P0420 came up and now my car started hesitating. Oh, and overheating now

[@nondainc]

Hi Raul, kindly inspect the exhaust manifold, gaskets, and exhaust pipes pre-catalytic converter for any leaks. Then check if there's an issue with the voltage reading of the downstream O2 sensor.

[@elciodacostateixeira6581]

Excellent explanation!!! 👏👏👏👏

[@nondainc]

We appreciate your feedback, Elcio!

[@SardarGulJabbari]

Great 👍 When my car Hyundai accent 2017 be Hot 🔥 appears the check engine lamp with the codes p0104 and p0420. Thank you

[@nondainc]

Hi Sardar, we highly suggest getting your vehicle checked with your local mechanic if you're getting more than one error codes for further diagnosis.

[@80s_baby_teo]

Very thorough video, thank you. I have this problem with a 05 Subaru legacy 2.5i, I really do not want to replace cat if I don’t have to. Can a garage run diagnostics to pinpoint the problem? And also I gave a California emissions car but don’t live in California if I had to replace cat with aftermarket do I have to get a California emissions cat, cause they are considerably more expensive or will a non cal emissions cat work?

[@nondainc]

Hi Terry, thanks for your feedback! The California emission catalytic converter is suggested.

[@okusajojamiu5959]

Good afternoon please I have Toyota Camry 2006 model there is no catalyst in inside the two catalyst is remove I wasting gar fuel ⛽ I want to know maybe is catalyst dat cause it pls

[@almariosambo6091]

Thank You

[@nondainc]

Hope it helps! Thanks for watching!

[@jeremiahsandoval5583]

My 2002 Nissan Altima 2.5L has this code right after I replaced my upstream sensor. What do I do?

[@mattchew4161]

run the cat cleaner through, or try lacquer.thinner

[@nondainc]

Hi Jeremiah, you can follow the DIY steps/guide on how to fix Nissan P0420 code here: kzbin.info/www/bejne/hHa2h3aoqMaLm5Y

[@Osme79]

Very well explained 👏

[@nondainc]

We appreciate your feedback!

[@TheWilferch]

Method 3, Non fouler idea is illegal and can cause more severe later problems.....

[@suspectfisherman2227]

What problems is it causing? I guess if you leave the cat on it’ll eventually plug all the way up and melt down🤷🏻‍♂️ The nice thing about the non fouler is that you can pull the o2 sensor far enough out of the exhaust stream to get away with no catalytic converter.

[@FORTRAN4ever]

Excellent instruction video. We have both P0171 and P0420. Could these codes be related?

[@nondainc]

Hello, it's somehow related as either the upstream or the downstream sensor could be triggering these codes.

[@LilyWillow22]

Dump a can of Oxicat … clears the code 🕺🏾

[@TheValleyNerdz]

I have a 2012 nissan versa and I got this code p0420 catalyst system efficiency below threshold bank 1, I've tried cataclean and it didn't work. What should I try next?

[@nondainc]

Hello, you may try the other methods provided in our video. Thank you!

[@jonmo2694]

when's the last time you changed spark plugs?

[@jonmo2694]

is your gas cap ok?

[@Wasco_Builds]

question can the po420 cause miss fires because i have the same code and am currently experiencing convulsion in my boost and studers

[@nondainc]

Hello, can you please provide us with your vehicle's year, make and model?

[@girohead]

I bet it's more likely the misfires polluting the cat to cause the 420. I'd fix the misfire first (my case was old coil pack boots) then try cleaning the cat. But some say backpressure could be an issue with some cats, but I think chemical damage is more often than physical melting. Just my two cents.

[@MrTheHillfolk]

Misfiring dumps tons of fuel into them and usually burns them up, the longer you ride around like that the chances are it's already toasted.

[@1jeliaz]

I have a 2014 Silverado 1500 replaced both cats and oxygen sensors and light came back on it is because they are not OEM?

[@nondainc]

Hello, we highly suggest OEM sensors for your car. Also, please check if there's an exhaust leak.

[@romanbezensek7595]

I clean the catalyst by pouring thinner into the fuel once a year.

[@aalgowhary]

I have replaced the Cat twice and the upstream O2 sensor and check engine light came back on after 300 miles and error code P0420. I passed inspection before the light came back. The mechanic advises flushing the computer as the P0420 code is stored in the memory and needs to be removed. Any advice? Thanks

[@nondainc]

Hi Ashraf, please provide us with your vehicle's year, make and model so we can address your concern according to your specific vehicle make/model.

[@aalgowhary]

@@nondainc My car is Toyota Camry 2011 LE 4 Cylinders, 2.5L.

[@dougm.2579]

Yooo this is the same vehicle I have with the exact same issue. May I have the same advice? Thank you.

[@aalgowhary]

@@dougm.2579 place a spacer to the O2 sensor as shown in the video., this should fix the issue.

[@dynamicenergry6360]

Take battery out touch both Post together for 3 min will reset computer

[@rebeldalton175]

thanks mate. great video.👍👍

[@nondainc]

We appreciate your feedback!

[@khurramnaseer2783]

Hello Sir ! I have two code PO420 and PO430 on Mazda CX 09 2016 engine size 3.7. Engine light is on and Recently passed emission test . Is this possible convertor damge or I need to replace sensor only ? Because I have cleared emission test with this code.

[@nondainc]

Hi Khurram, we suggest getting your vehicle visually inspected by you local mechanic for further diagnosis.

[@zafarislam9382]

Hi I have 2010 Toyota tundra taking too much gas I don’t know what to do please send me the solution thank you so much

[@nondainc]

HI Zafar, please confirm if this is the only code you're getting.

[@nestor.valentino]

2011 Chevrolet Traverse LS 3.6L V6. 198000km. P0420. The code shows up intermittently. No driveability issues yet. It disappears after putting fuel system / exhaust cleaners. Questions: 1. Can I keep doing this for 2 years and not expect damage to the engine? If I do an exhaust restriction and there's no restriction, I should be OK right? 2. Can P0420 mean my engine is failing?

[@nondainc]

Hi Nestor, can you please confirm if this is the only code you're getting?

[@nestor.valentino]

@@nondainc Yes its a lone code. No drivability issues. The o2 sensor 2 follows o2 sensor 1. We don't do emissions testing where I live. I used to have a p0301 code caused by the ignition coil being wet but that has been resolved.

[@pedrosanchezbarcelos2916]

Hello I have a 2010 Toyota Corolla LE with the 2 p0420 codes, I added the Catalytic cleaner but the code remained there

[@nondainc]

Hi Pedro, have you checked if there's an exhaust leak? Please also verify if the upstream o2 sensor and downstream o2 sensor is working properly.

[@pedrosanchezbarcelos2916]

@@nondainc I have not but will check now Thank you

[@precool]

Awesome! Thank you!

[@nondainc]

You're welcome, Jeffrey! Hope it helps!

[@precool]

@@nondainc I’ve got a 07 Mini Cooper S. Literally going through a rough patch. Replaced coils, plugs, 02’s, carbon cleaning and oil change. Still rough starts and on and off limp mode. Little to no boost. Muffler pro said the cat is fine. 🤔🤷🏻‍♂️

[@warfarewar8206]

I have a 2015 Mazda 3 touring made in Japan with these codes and there titles any idea what it means 1).1 permanent trouble code P0421 "catalyst 1 efficiency below threshold bank 1, 2).1 power control module code P0421-00 status :MIL/CONFIRMED/PENDING -catalyst 1 efficiency below threshold bank 1: no sub type information

[@nondainc]

Hello, can you please confirm if there's any other fault codes registering along with this code?

[@highoneherif]

Hi, I have a question about P0420. I have2013 nissan pathfinder. My check engine light pumpa up with code P0420 but after a while it's corrects it self and the light goes off. It did that 4 times already. I was wondering if it means anything?

[@nondainc]

Hi Emrah, this code refers to "Catalyst System Efficiency Below Threshold" which is often triggered by a faulty O2 sensor (upstream side of the catalytic converter). We suggest checking the exhaust for leaks and testing the O2 sensors if functioning properly.

[@jeffbrown3963]

Method 3 - the extender - does it go on the sensor before or after the converter?

[@nondainc]

Hi Jeff, please provide us with your car's year, make and model.

[@jeffbrown3963]

@@nondainc we replaced the sensor on bank 1 sensor 2 on an F250 and it cleared the 420 code. Thanks for your help!

[@TheWilferch]

Downstream sensor....but don't do it, it's illegal and can cause later problems.

[@claranevels104]

I have a 2020 Mitsubishi outlander sport SE, and replace my catalytic converter, and 02 sensor. my service engine light was on and once the put the 02 sensor its went off but came back on the next day bought to Mitsubishi and it went off but came back on again.

[@nondainc]

Hi Clara, have you double checked if this is the only code that registers?

[@dementia_81]

Hi Clara, I do have the same car and same issue right now! CN you please tell me if it was a clogged catalytic converter or a faulty oxygen sensor?

[@mistywuest6626]

How long will it take before the engine light will go off after putting the cleaner in?

[@nondainc]

Hi Misty, as long as there's no other fault codes registering together with code, it should be fixed immediately. But we'd like to clarify that this isn't the only fix for this code as there's also other parts to be checked.

[@thewestwaychannel5872]

I got a 2003 s10 changed all three 02 sensors. The cat was bad so I bung a test pipe and place the brand new sensor in do you think it’s because of how I tried to by pass having a cat

[@nondainc]

Yes.

[@hectorsalazar3960]

My 2011 accord coupe shows the p0420 code bank 1 just yesterday I started to hear a rattling noise coming from 7nder the car it comes and goes away you think mt cat is done for

[@nondainc]

Hi Hector, can you please confirm if this is the only code you're getting?

[@hectorsalazar3960]

@@nondainc yes thats only one

[@nondainc]

Hi Hector, the code could be triggered by a faulty oxygen sensor or bad catalytic converter.

[@solaimaniac]

If i wanna put O2 sensor spacer then i should put with upstream or downstream sensor? Getting fault code P0420. Vehicle Model Elantra 2015 1.6

[@nondainc]

Hello, it's on the upstream side.

[@markforeman91]

OMG how dumb can you get! The only O2 sensor that monitors the cat is downstream from the cat so how is the upstream sensor going to monitor the cat? The upstream sensor only monitors if the engine is running rich or lean and nothing else. If you put a spacer upstream than the sensor doesn't know if the engine is rich or lean and really sets a lot of codes.

[@NeutronX101]

Does washing actually work?

[@nondainc]

Yes. Thank you for watching!

[@Jetsmuseum]

Hey my car I believe is misfiring with this code which one would fix that issue would that maybe be spark plugs ?

[@nondainc]

Hello, please provide us with your car's year, make and model.

[@reginacaldanaro9440]

I have a 2015 Honda Pilot. Last week the check engine light came on and I took it to my mechanic. He didn’t tell me the code. He said “engine running lean” and replace the air filter. It was fine all week. Last night it came on again. Went to autozone and got PO420 (cat sys efficiency below threshold bank 1. Can I drive it for a day or two until I can get to mechanic? Will it hurt to try cataclean? I know it might not work. But it won’t hurt anything right? I still need to have it checked. It has some trouble starting for a while. No bad smells, noises, or smoke. Passed inspection in February. Has 154000 miles. Slight drop in fuel efficiency. No performance issues. Always use cheapest gas. Should I try better gas? What octane and from who? I usually do Circle K.

[@jasonreviews]

i've been having that code for years. It just means your cat might be going out. You won't pass smog test tho with the code. For honda you might have to replace OEM cat which is very expensive. You can try to do from following above video. Cats only last up to 100k to life the car. You never know.

[@nondainc]

Hi Regina, if there's no other codes that register along with this code, we suggest following the repair procedures provided in our video. Hope it helps!

[@JVazquez-e5x]

Did you resolve your code ?

[@kencane4182]

My 2012 ford explorer 3.5 2wd. Have a Code of p0420 that come and go. Do you think I have a bad cat or sensor? TIA

[@nondainc]

Yes. Issue with the mentioned parts are actually what triggers the code.

[@bmjhockey1]

I have the same vehicle except it is the AWD XLT version, replaced o2 sensors, replaced ignition coils, replaced spark plugs, still had major issues. Took one of the o2 sensors out and looked inside the cat and it was completely shattered. It’s a pain in the a$

[@andersongiraldo6643]

hey i have a chevy malibu 2016 ls and im getting the p0171 m, p0420 and p1101 what can possibly be the issue with these codes?

[@nondainc]

Hello, as you are getting more than one error code, we suggest getting your vehicle visually checked by your local mechanic for further diagnosis.

[@eddierosario1537]

Does this have anything to do with a transmisión

[@nondainc]

Hi Eddie, it's an issue with the catalytic converter. If this is the only code that you're receiving then you can follow the guide/solutions provided in our video on how to fix P0420.

[@JeremyGood]

I'm getting a po400 and po420, could the po400 be causing the other po420 error code?

[@nondainc]

Hello, as you are receiving more than one error code, we suggest getting your vehicle visually checked by your local mechanic for further diagnosis. Thanks for watching!

[@user-up4zi1do6p]

Excellent video

[@nondainc]

We appreciate your feedback!

[@teemyster7401]

Just got p0420 on 03 Honda Civic. Can I use the cleaner for that kind of vehicle?

[@nondainc]

Hello, we suggest using the products from here: amzn.to/3r67qCf Thank you!

[@darthtraya5992]

Why would this make my car click rapidly?it’s not the battery thoughts anyone? This is the only code that came up

[@santi8511]

Hi i have a golf 5 1.4 fsi and i have check engine code p0420 i have change oxygen sensor and the car is the same and sometime car gassing up alone help me

[@nondainc]

Hello, if there's no other codes that register along with this code, then we suggest following the tips/solutions provided in our video on how to fix P0420. Hope it helps!

[@santi8511]

One reason why the car gassing up alone

[@malayalamworldent9662]

After pouring catalytic converter cleaner .need to change engine oil?????reply me plz..

[@nondainc]

Hello, can you please provide us with your vehicle's year, make and model so we can provide you information specifically for your vehicle's make and model?

[@malayalamworldent9662]

Honda cr-v 2010 ,2.4 liter ivtec engine(k24z),5AT transmission.

[@92501le386]

I fear I might need new cat, my question is if there is such a thing as California cat. Converters that are much cheaper?

[@nondainc]

Hello, can you please provide us with your vehicle's year, make and model?

[@whateverr472]

What type of detergent to clean the catalytic converter?

[@nondainc]

Hello, you can purchase it using this link: amzn.to/3sbMISV Hope this helps!

[@meshackmisho5965]

what solution do you recommend if i have completely removed the catalyst converter and i get the P0420 error code

[@nondainc]

Hi Meshak, please provide us with your vehicle's year, make and model.

[@meshackmisho5965]

@@nondainc HI am driving a vw golf 6 tsi year 2009

[@nondainc]

Hi Meshaf, since we are against having the catalytic converter being removed (to comply with air emission standards that were set for safety environment), we're afraid we couldn't provide any solution in this case. We suggest placing a new cat as well as checking the O2 sensor, O2 sensor wiring, and inspecting for exhaust leak.

[@DupekCSS]

You have to completely decode O2 sensors for your ECU, but then car will run on standard map. It is never good idea to get rid of catalytic converter. There is a O2 sensor emulator. That you can add to your engine harness. That way u can "cheat" ecu.

[@kimberlydwilson6544]

Hi! I have a 2011 Buick Enclave CXL 2fwd I’m getting a catalyst system efficiency DTC severity 2 of 3 repair immediately. Is it my catalyst converter or could it be my water pump? What should I do clean it or replace it??

[@nondainc]

Hi Kimberly, have you checked if there's an exhaust leak? You need to test the O2 sensors (upstream side of the catalytic converter) and the catalytic converter to pinpoint what's causing the issue.

[@Whit_Siever]

Will spraying carb cleaner inside the catalyst eliminate P0420?

[@nondainc]

Hi Whit, we can only recommend the 9 methods/solutions provided in our video. Thank you!

[@ahmedeltahaan590]

p2701 Hyundai transmission friction element 'B' apply time range /performance

[@nondainc]

Hi Ahmed, you may head over to this link for your concern. kzbin.info/www/bejne/hYK5hpSFp9-ci9E Kindly check the condition of the following and repair/replace if necessary: Transmission fluid/filter, wiring/connectors, transmission pump, TCM, output speed sensor/input speed sensor and inspect for transmission fluid leaks.

[@vibez1017]

I have codes p0420 and p0132 on a 2015 Chevy Sonic LT 1.8L with no check engine light on . I have been experiencing the car shutting off while driving lost of power in it , and jerks badly when accelerating. Any idea of what this could be ? Please and thank you .

[@nondainc]

Hello, as you are receiving more than one error code, we suggest getting your vehicle visually checked by your local mechanic for further diagnosis. Thanks for watching!

[@mikrokosmos_uwu946]

Have u done anything to fix this or got it diagnosed? Im experiencing a p0420 code with my 2014 chevy sonic ltz. Im experiencing the same issues except for the car shutting off

[@adekunleolamilekan2094]

Good day, my 2008 Toyota Camry XLE V6 check engine light popped up when I was on top speed traveling, I began to notice a little bit increased sound when I start the engine. I used a scanner and it detected P0420 low catalyst efficiency below threshold bank 1… what do I do? Thanks

[@nondainc]

Hello, kindly inspect the exhaust manifold, gaskets, and exhaust pipes pre-catalytic converter for any leaks and repair it right away. If the issue will continue to persist, check if there's an issue with the voltage reading of the downstream O2 sensor. Since you are also hearing a noise when starting the engine, we suggest checking the temperature of the pipe before and after the catalytic converter using a thermal gun as this will easily help you know if the catalytic converter or the down stream Oxygen sensor is faulty.

[@adekunleolamilekan2094]

@@nondainc thank you for the response. We detected the exhaust flex/net has a leak, can that be the cause of the problem?

[@nondainc]

Probably yes, Adekunle. Try also checking the temperature of the pipe before and after the catalytic converter.

[@adekunleolamilekan2094]

So after changing the exhaust flex, removing and reinstalling the exhaust manifold carrying the catalyst after thoroughly washing it together with the O2 sensors, check engine totally disappeared and performance greatly improved. 👍🏾

[@nondainc]

We're glad to hear that you have sorted out the issue. Stay safe, Adekunie!

[@danieltraconis1476]

Catalytic cleaners don't work.

[@БурыйМедведь-я6ы]

Which cleaner did you use?

[@araelxan1665]

Hello Sir, I really like your vedios, its very helpfull, but i have a qustion. I have an Audi A6 2014 2.0 torbu and Ihave a problem that my car has a delay with first gear & retern (automatice gear) with cold start & blowing smoke from the exust when I start moving slowly the car jumping needs to turns off Iwent yo the service center they talled me I have a code P0011 so I have to change the intake camshaft and I know that they have no experiance to repair Audi cars So please can you helpe me with that ? what i have to do

[@nondainc]

Hi Ara, there are multiple factors that could be contributing to the appearance of this code particularly for your vehicle's make/model. We suggest checking the condition of the Intake Valve Timing Control Solenoid Valve/harness or electrical connection, condition of the camshaft position sensor/ harness or electrical connection, engine coolant temperature sensor and the crankshaft position sensor.

[@araelxan1665]

@@nondainc Thank you so much for your help, I have already toke off the CAM& I found the connection clip of the Camshaft Adjuster Magnet full of oil, is that a reason for this fault?

[@nondainc]

Possibly, yes Ara.

[@GO-wb1gf]

P0420 2007 honda civic hybrid bank 1 catalyst system code. Any help/tips/ suggestions you can give me ? Please and thank you

[@nondainc]

Hello, if there's no other codes registering together with this code, you can follow the DIY tips/guide provided in our video on how to fix P0420.

[@GO-wb1gf]

@@nondainc initially the only code I came up with was P0420 and changed both 02 sensors but now it bunched up with my MAF Sensor despite me just getting a new one recently. I'm really debating just spending the money and getting a new Cat even tho I don't want to at all

[@nondainc]

Have you checked the O2 sensor wiring? We also suggest checking the engine temp sensor, timing and look for exhaust leak.

[@GO-wb1gf]

@@nondainc thank you! Will do forsure

[@tyronewalker5764]

I just replaced 2 O2 sensors and still have a P0420 error and no smoke or sulfur smell. Dodge Dakota 2k/4.7 V8.

[@БурыйМедведь-я6ы]

Dura Lube catalytic converter cleaner, Walmart, $20

[@dannyfernandez4768]

Fuel cap! Fix my problem!

[@nondainc]

👍

[@gth882]

Bought from dealer??

[@loishipple596]

girohead, so yours ended up being the cat then. OK well i really don't want to spend time puling out the intake manifold and putting in a new gasket when i don't even know if that will clear my P0420, I might as well start looking in to a cat. Thanks for the info, I guess i can try the soapy water spray first.

[@nondainc]

Hope it helps!

[@banjabisamsung]

Yes

[@mr.gameandteach7197]

So, basically, get a new catalytic converter. My car isn't experiencing any of those solutions.

[@billybad1]

Would soaking in vinegar vs soapy water work?

[@nondainc]

Hi William, we highly suggest the options provided in our video. Thank you!

[@brbroberts1]

LOL garbage. First issue: confusing/conflating the function of the upstream O2 sensor and the downstream O2 sensor.

[@mazambeliqbal3487]

Hi am looking for catalytic converter clean Detergent Soap but can't find it on amazon

[@nondainc]

Hi Mazambel, here's the link for the Detergent Soap: amzn.to/3sbMISV

[@jonmo2694]

You can use laundry detergent

[@peterigwilopi]

Hello, I have a 2013 Infiniti Fx37, and it's showing code po430, B2 low efficiency cat. What brand of catalytic converter should I go for? Help please

[@nondainc]

Hello, you can head over to this link [Catalytic Converter Cleaner: amzn.to/3r67qCf ] Hope it helps!

[@okanbayrbas7067]

2007 VW JETTA.P0420

[@nondainc]

Hi Okan, you can follow the DIY tips/suggestions provided in our video on how to fix P0420. Hope it helps!

[@noelleallwin]

I have the same code for my 2007 VW Jetta Along with mechanic advising that I remove cylinder head 🤔

[@markforeman91]

Sorry most of this is BS. And spacers do not fix the problem just take the sensor out of the flow of exhaust so it will not longer read the exhaust values. And it will not work in cars after 2012 because they got wise to this and set a program in the computer to detect it. If your check engine lite starts flashing while you are driving pull over and shut the engine off and get the car towed or keep driving and ruin the cat.

[@yonastesfay7775]

Nice Keep it up

[@nondainc]

Thank you! Stay safe, Yonas.

[@devilboykillz]

I got a 2011 Chevrolet Traverse i just bought with 222k miles. Test drove it 3 times before i bought it and ran fine every time. Had a 40 min drive home from lot and about 30 min in the rpms started to drop. I took it to auto zone and got it tested for free and they said it was a bad catalyst system low efficiency bank 1. Told me to try Cadi clean but they was out every where so i got a diff brand and it took the check engine light off but it still ran like shit. Put it in a shop and they charged me almost a k to replace the first one. I get it back and drive my wife to work that night and it does the same stuff. Took it back to auto zone and it pops for the same thing. Do you think it a bad o2 sensor or converter that is post to be new. Cant get no one to answer my call at the shop in 4 days. Also if it is o2 sensor are they required to fix it for free since they misdiagnosed my car. They even told me it was the converter.

[@nondainc]

Hello, have you double checked if there's any other fault code that registers along with this code?

[@devilboykillz]

@@nondainc both times i took it to auto zone that is the only code. people at the shop acted like that was the only thing wrong with it too. I even told them that was the reason i brought it in to make sure it was the converter and not something els. Starting to think they played me because i put some stuff in it to clean the converter before i put it in the shop and it made the check engine light go off. So im not even sure if they can run a test with no check engine light on.

[@nondainc]

Hello, the issue could be coming from the O2 sensor. To be sure, we suggest performing a test on your O2 sensor and catalytic converter.

[@nestor.valentino]

@devilboykillz Was it fixed now?

[@Lothyde]

I don't get any of these symptoms

[@nondainc]

Hello, can you tell us your vehicle's year, make and model?

[@Lothyde]

@@nondainc Hi! I have a 2016 Audi A1 Sportback, I have done basic maintenance, replaced oil and filters. Checked for exhaust leaks. I am using high quality fuel. I get the P0420 error. I have not yet tried all solutions here, but I just find it weird that I don't get any symptoms. The car operates normally and if it wasn't for the error I would say it was 100% fine! Without symptoms it's much harder to diagnose this problem. I think I will change spark plugs next, I don't think they've ever been changed.

[@nondainc]

Have you double checked if there's any other fault code that registers along with PO420?

[@Lothyde]

@@nondainc There is no other code.

[@nondainc]

Please follow the methods we have provided in our video and kindly let us know if there's any update. Hope it helps!

[@carlobert8076]

Think congress slammed hammer on EPA we all can actually straight pipe them 2024

[@carlobert8076]

And more information about that meet word to word everyone who got fined for exhaust leaks or modified exhaust in the meeting congress everyone everyone has access to sue the EPA because they was actually lying about it was law congress never signed bill for EPA and there not law maker's

[@bigredmoet]

I did everything here except the cat but now im pretty sure its my coolant thermostat

[@michael7544]

My Suzuki Grand Vitera, I'm chasing a 👻 that's giving me a PO420 code , Suzuki is nothing but trash......

[@Jared_Albert]

Beat made this unwatchable

[@ezwa9979]

gr8 viDO, 😩buuuuuuuddftt??… 😯wat aboOt, thE OTHERrrr.. infinity -9 possibilities, hmnnn?? - IO, the DREADED meaninglS P420.

[@nondainc]

You cOuLd chEcK mORe possibLe caUseS: Faulty Three-way Catalyst Converter Bank 1 Exhaust Tube Intake Air Leaks Faulty Oxygen (O2) Sensor Faulty Fuel Injector(s) Leaking Fuel Injector (s) Faulty Spark Plugs Improper Ignition Timing Faulty Engine Control Module (ECM) Dirty Air Filter

[@ezwa9979]

okdOk- wEr doOn to infiniT -12, nooot 2 shaB☹️✋

[@JoseMartinez-jl1mk]

👍🏿

[@nondainc]

Thanks for watching, Jose!