Catalytic Converter Efficiency Below Threshold: Code P0420 & P0430 Diagnosis and Repair

[@samuelsnipes3330]

Excellent. Fix the CAUSE. I got a p0420, and every shop tried telling me just replace the CAT for $1,800. NONE of them wanted to look at anything else to find the source of the problem. The problem was severely carbonized spark plugs not burning fuel effectively and leaking liquid fuel into exhaust sytem clogging the CAT. replaced plugs, cleaned the CAT, intake and ran some fuel system cleaners. Been running ever since

[@KITS_Auto_and_Truck_Repair]

Samuel Snipes Thanks! I'm glad to hear that you were able to figure it out!

[@richarddesimone960]

This happened to me. Also, an exhaust leak on my flex pipe wasn't letting it get a propper reading

[@deanjagger1190]

Great thing to hear. Saving Big bucks. I have the same thing with my C C. I have tried many things because the bash has litten up like a Chistmas tree, and the wind shield wippers are driving me insane. So I unpluged the fuse. It also say on the computer Blind Spot System need survice. But when I start up in the morning or when ever the the engine is cold it blinks and all the warning lights come on.

[@marcosman3393]

Wat cleaner did you use

[@binobino9078]

That was an excellent explanation, u must be a teacher. Thanks

[@unfilteredjamaican3478]

Some folks deserve a subscription. He’s a legend at saving folks money with practical diagnostic skills and great explanation. Make more vids man.

[@KITS_Auto_and_Truck_Repair]

@unfilteredjamaican3478 Thank you!

[@brianszuch6774]

Finally, someone on KZbin that knows what they're doing. Excellent videos, video, good troubleshooting, good execution

[@KITS_Auto_and_Truck_Repair]

@brianszuch6774 Thank you!

[@phatcy]

Fantastic! A rare find of looking for a root cause of the problem, clearly showing diagnostic confirmation of the problem, fixing the problem ( root cause already fixed ), and diagnostically confirming the fix! Thank you.

[@KITS_Auto_and_Truck_Repair]

@phatcy My Pleasure!

[@davidmansell6444]

This is the man I want working on my cars....one that can talk the talk AND walk the walk too! EXCELLENT video.

[@KITS_Auto_and_Truck_Repair]

David Mansell Thank you!

[@OP-ik7qb]

The brake booster pedal trick is awesome. Never heard of that not even from Paul Danner. Great video brother! Thanks

[@KITS_Auto_and_Truck_Repair]

@OP-ik7qb My Pleasure! Thanks!

[@2bnax]

THAT IS GREAT!!!!!

[@mikyahl8749]

First time that I've heard Short and long term explained in all of my 29 years of service. Even teachers and other techs have not nailed it like this bro. Most other people want to be heard for their much speaking instead of making the point clear.

[@KITS_Auto_and_Truck_Repair]

MiKyahl Thank you!!

[@one-to-one-ratio]

FOR REAL, I SWEAR THIS IS THE ONLY CAR VIDEO DONE PROPERLY

[@rohanboswell5408]

What's the max heat range for the cat=and what's the comfort mv for the O2=

[@mboemmels]

​@@KITS_Auto_and_Truck_Repair yes i agree...first time ive found a good lesson on reading the o2 numbers! Thank you!

[@mboemmels]

Great video! When reading temp i believe before cat was 390 and after cat was 330...you said the after cat temp should be much cooler than before cat...hiw much cooler? 330 is 20% cooler what after cat temp number should we have seen? If it clogged wouldnt after cat be alot cooler also?

[@thomasevans5475]

You have a magnificent brain, sir. I've never seen a mechanic explain this so simply. Your understanding of the complexity of the various issues and your ability to articulate a repair response that is so easily followed are beyond commendable. My teacher wasn't even this clear. Thank you for sharing and congratulations on your level of expertise. Have a blessed day and may God bless you and yours always.

[@KITS_Auto_and_Truck_Repair]

@thomasevans5475 Thank you my Friend!

[@GabrielEbenezer-b2s]

​I love you sir ♥️ 💯 ✅ ❤️ @@KITS_Auto_and_Truck_Repair

[@vincentklotz5849]

Kit, Two weeks of searching KZbin for diagnostic information on O2 sensors and fuel trim. Finally, You have the best video by far. Very thorough from start to finish.

[@KITS_Auto_and_Truck_Repair]

@vincentklotz5849 Thank you!

[@biolabiola85]

I really appreciate you with deep technical information that bunches of uneducated in reading of computer diagnostics. All they tell you is just the codes, without telling the course of the issues.

[@KITS_Auto_and_Truck_Repair]

@biolabiola85 Thank you!

[@peterkings3040]

teaching is a gift and you definitely know how to teach. every child needs a teacher like this man here very simple with his explanations and very easy to understand and replicate. he is making auto mechanic look like a walk in the park 👍

[@KITS_Auto_and_Truck_Repair]

@peterkings3040 Thank you!

[@AbdeldjalilMokri]

Honestly I’ve never watched a video for 1 hour from beginning to the end accept yours thank you so much for explaining and god bless you from my heart

[@KITS_Auto_and_Truck_Repair]

@AbdeldjalilMokri Thank you!

[@dricklorenz9340]

I'm glad I stuck around. I thought when the cats were condemned in the beginning we were going straight to replacement. Great overview of the troubleshooting process.

[@KITS_Auto_and_Truck_Repair]

Drick Lorenz Thank you!

[@lazerrred]

Great, clear, concise PROFESSIONAL information that finds the root of the problem and FIXES the cause, not just the symptoms. Plus, I would bet 99% of most shops would never asked or have found out the engine was replaced and the cats may have had 200k miles on them. Yes my friend you said it, “ fix the cause, not the symptoms”. 👍👍. VERY COOL. Edit, Subbed too.

[@KITS_Auto_and_Truck_Repair]

lazerrred My Pleasure, I appreciate it!!

[@melaniopimentel6189]

Thanks you for helping to understand and troubleshoot the P0420/p0430 correctly, I wish all car repair shops do the same. I always found shops that only replace parts without knowing exactly the problem. Keep up the good work work. Thanks again

[@KITS_Auto_and_Truck_Repair]

@melaniopimentel6189 My Pleasure! Thanks

[@juderoberts342]

I love this. You are an excellent teacher. VERY CLEAR EXPLANATION supported with doubtless evidence.

[@KITS_Auto_and_Truck_Repair]

Jude Roberts Thank you!!

[@luisrodriguez9712]

First I would like to start off by saying I watched this video from the very first second to the very last second and I must tip my hat off to you sir. You are very straight forward, informative, precise and honest! I wish I could find a quality and honest mechanic like you where I live. I'm not sure where you're located or if you have any contact info, but I would surely become your loyal customer. The reason I say you're honest is because as soon as you turned that vehicle on after the installation was over with and that check engine light went away... you could've easily fooled everyone and told us there you have it folks the check engine light is gone because we fixed the problem. You sir did not do that. You told us the truth! When disconnecting the battery cable(s) from the battery it essentially clears any codes stored in the vehicles computer/memory (which is true). I respect and admire you for that. I have a 2007 Hyundai entourage limited V6 3.8L and I have a P0430 code. I'm doing everything myself thus far and in doing so I found a lot of cutting corners from every "mechanic" that has worked on my car in the past 6 years or so. I'm not a mechanic by any means and I'm learning as I go by researching and reading. Every shop I have gone to so far... everyone says it's the catalytic converter, but not the two that you changed. They're saying it's the catalytic converter that's underneath the car. No one has done any tests of any kind to determine if it is in fact that catalytic converter. They're just saying it's that one. My gut is telling me it isn't, but again I'm not a mechanic and I could be wrong. The car runs like a champ! You wouldn't think there's anything wrong with it. I do know the fuel is either too rich or lean because my gas gauge is always fluctuating up and down before finally settling and before this code appeared I never had fuel issues. Some times from the muffler I can smell a very rich gasoline like smell. I was also told to first replace the spark plugs and go from there. Start with the smaller stuff before changing the catalytic converter to see where the problem is coming from. I've already changed that and all the O2 sensors, but the check engine light came on again with the same code of P0430 bank 2 catalyst system efficiency was below threshold for a predetermined period of time. I'm just now sure which catalytic converter it could be. Would you be able to share what name brand and model # obd2 you are using so I can look into purchasing one? I'm sorry for this long message, I appreciate your time and the time you put into this video for us. I hope to hear from you soon. Take care!

[@KITS_Auto_and_Truck_Repair]

Luis Rodriguez, I really did appreciate your comment I read the all message, thank you for watching the video... the scan tool I'm using in the video is a professional type scanner, since you're working on your own vehicle I would not recommend that kind of scanner, you should get a regular OBD2 scanner that can graph data parameters from your local parts store... Now, about the P0430 trouble code that keeps coming back on your car, I will say, you should check the wiring of the 02 sensors especially the one after the catalytic converter, then double check the sensors in case you got defective sensors out of the box, if everything checks out ok the last thing would be a bad catalytic converter, if you end up replacing the cat, make sure you determine the cause that caused it to fail before you replace it... I have a couple of videos on this channel that can show you how to test the 02 sensor wiring or the 02 sensor itself.... Good Luck

[@luisrodriguez9712]

@@KITS_Auto_and_Truck_Repair thank you for responding! Not sure what's a good scanner that can do the same as yours or close to what yours can do. I'm very meticulous when it comes to doing things and that's why I asked. If you have any recommendations I'd gladly appreciate it. Which catalytic converter would be the one that I would change if it does come down to that? Is it the one underneath the car or is it the one you changed in the video? Thanks again for responding and have yourself a great night.

[@KITS_Auto_and_Truck_Repair]

@@luisrodriguez9712 I can't tell you which one to change; you have to get it diagnosed so you can know exactly which one to replace. I recommend taking it to a professional shop... Good Luck!!!

[@borkganza9627]

@ Luis Rodriguez it’s a Snap on Zeus.

[@luisrodriguez9712]

@ Bork Ganza thank you

[@lawsonstallings1955]

This is the most thorough diagnostic video on o2 sensors and catalytic converters I've seen. Congratulations.

[@KITS_Auto_and_Truck_Repair]

Lawson Stallings My Pleasure, Thanks

[@lawsonstallings1955]

@@KITS_Auto_and_Truck_Repair I have an 07 525i and the brake test didn't affect the sensors' data. I shot a couple of videos that I can send you if you have the time to have a look at my data.

[@TheMonear]

To be honest with you, the first video watched, I gave you a Post- thumbs up, the second video, I gave you also a Post- thumbs up and then, I have found that you deserve a Pre- thumbs up! Your way of teaching takes me from ground ZERO maybe even less, to a high level. Professor!!!

[@KITS_Auto_and_Truck_Repair]

Monear Belkasim Thank you! I appreciate it!

[@MrHeffnerpf]

This showed the most practical and informative diagnostic techniques (I've watched literally dozens of videos that didn't get this practical) for getting comfortable with whether the sensors or the cat are bad! thank you!!!

[@KITS_Auto_and_Truck_Repair]

@MrHeffnerpf My Pleasure!

[@18-sec-rings]

I really appreciate the exact way that you explained how the graph diagnostics were operating before and after the repair, nicely done!!!

[@KITS_Auto_and_Truck_Repair]

A S Thank you!

[@robhillman5957]

At last!!!!! Someone who knows what they are talking about and is also able to explain exactly how things work in a clear and easy to understand way. Watching the video was an absolute pleasure, thank you, I can now make sense of my own vehicles problems etc.

[@KITS_Auto_and_Truck_Repair]

@robhillman5957 Thank you!

[@aklilumesfin4137]

You're an awesome auto mechanic. You're really an excellent teacher. The best video I have really liked to watch. Detailed explanation on the issue was amazing. So thank you so much for doing what you're doing. I like auto mechanics who are knowledgeable and above all honest. All your customers must be lucky and thankful to have you as their cars' mechanic.

[@KITS_Auto_and_Truck_Repair]

aklilu mesfin My Pleasure! Thank you!

[@tonyowen5102]

what a video. not only is this guy a knowledgeable and qualified mechanic, but he also knows just how to make a video that covers all the bases. great job!!

[@KITS_Auto_and_Truck_Repair]

@tonyowen5102 Thank you!

[@gzz314]

YOU ARE A GURU OF A MECHANIC AND OF KZbin SIR. YOU SPEND ONE HOUR OF EVERY DETAIL ON THE SUBJECT. THANK YOU. GEORGE Z

[@KITS_Auto_and_Truck_Repair]

George Zamau'l Zulfekar My Pleasure!! I appreciate you!!

[@allanfranco4464]

THANKYOU FOR A VERY CLEAR AND INFORMATIVE EXPLANATION OF LTFT AND STFT AND CHECKING GRAPHS AND WAVE FORMS TO TROUBLE SHOOT PROPERLY YOU TEACH VERY WELL AND IGET IT BEEN A MECHANIC ALL MY LIFE AND AT 65YEARS OLD STILL LEARNING FROM GOOD GUYS LIKE YOU THAT IS HONEST AND LOVE TO SHARE KNOWLEDGE ,GODBLESS YOU THANKS AGAIN

[@KITS_Auto_and_Truck_Repair]

@allanfranco4464 My Pleasure Sir! Thanks!

[@alexmartin21]

Because of this video I subscribed to your channel. Excellent well explained class about catalyst converter. A real substance and knowledge, well done. Professional Auto Mechanic!

[@KITS_Auto_and_Truck_Repair]

Alex Martin Thank you and welcome to our youtube community!

[@DEtchells]

Really excellent explanation of how to diagnose catalytic converters issues. I love the trick of pumping the brakes to make the engine run lean. Now I need to get a scan tool that will show me real-time data streams. (I just bought a cheap one that doesn’t have that feature, am going to return it and upgrade.) Thanks!!!

[@KITS_Auto_and_Truck_Repair]

Dave Etchells My Pleasure!! Thanks and Good Luck with your project!

[@rognrenee]

This is one of the best videos I've seen on these codes. Good job sir!

[@KITS_Auto_and_Truck_Repair]

Rog Botts Thank you!

[@JustMe-ln5je]

Hello K, I would like to point out the difference in temperature between the intake and output is not near the 100°f degrees you stated it should be. The temps on the old defective Cat were: Intake: 390.5°f Output: 334.4°f A difference of 56.1°f The temps on the NEW Cat was Intake: 404.3°f Output: 336.2°f A difference of 68.1°f The difference in temperature between the old and new is only 12°f degrees. It seems to me this is not a accurate method to determine if the catalytic converter is defective. I think your video is great. The detail and examples you show are top. You excel in quality the art of putting a great video together. Thank you

[@KITS_Auto_and_Truck_Repair]

Just Me Thank you! the rule of thumb is usually 100 degrees higher on the outlet, temperature wise!

[@dricklorenz9340]

@@KITS_Auto_and_Truck_Repair - Although the video seemed to explain the temperature difference incorrectly (I've understood that the outlet should be 100-150 degrees hotter) it is still great that you covered it so that people know this is a simple test that can be done. Great job.

[@KITS_Auto_and_Truck_Repair]

@@dricklorenz9340 Yes! That's what I meant but I misspoke in the video, Thank you!

[@garciahome7300]

I learned how to read scan tool data and apply it to fixing the problem. I took notes on diagnostic and testing progression. A very logical and mechanical instructional approach, plus a demonstration of how to apply it to the repair. This is better than the lecture videos that others make where they try to show you how much they know.

[@KITS_Auto_and_Truck_Repair]

Garcia Home Thanks, I'm glad to hear that the video was helpful!

[@emadgrabel3444]

Very deep information and a lot of details that haven’t found in many videos. Thank your for explaining.

[@KITS_Auto_and_Truck_Repair]

Emad Grabel My Pleasure!! Thanks

[@jiovannitaylor7812]

Very good and thorough explanation No excess material and self promotion. Very good use of automotive vocabulary

[@KITS_Auto_and_Truck_Repair]

@jiovannitaylor7812 Thank you!

[@syedali8005]

This video is excellent, I wish other people's videos would be like yours. I hope you keep making great videos like this one!

[@KITS_Auto_and_Truck_Repair]

Syed Ali Thank you!!

[@michaelmodelo9840]

This video is worth watching every single minute of it. It is a very detailed, informative, and straightforward tutorial on how to fix the trouble code without having any doubts of being scammed. It's not an easy job for me, and I might end up leaving it to a professional to fix the same issue as mine, but it's good to know the main cause and solution for the problem. You're the man for the job, bro! You deserve more subscribers and views. Thank you very much for this video.

[@KITS_Auto_and_Truck_Repair]

@michaelmodelo9840 My Pleasure! Thanks

[@jessed5585]

Thank you greatly for all the knowledge. I have a scanner and got this code code when I scanned my car.. (didnt show up on my dash as engine light), I have been wondering why my car has been sluggish and little bit poor fuel eco. You taught me enough in this video that I can read the scanner and try to see for myself if I have a bad cat or just the sensors first. Your a great teacher, I've subscribed and am looking forward to learning more, thank you! 👍

[@KITS_Auto_and_Truck_Repair]

Jesse D My Pleasure! I'm glad to hear that the video was helpful!

[@bigarabenjamin3627]

You are so smart. You explain everything very well and clearly. I don't know anything about diagnostic, but I'm understanding bit by bit

[@KITS_Auto_and_Truck_Repair]

@bigarabenjamin3627 Thank you!

[@danhitchcock727]

Really great video. Just had emissions failure and the P0420 code. Its an old car and we don't want to throw money at guessing the issue, this really gives some great pointers. Wish you were local!

[@KITS_Auto_and_Truck_Repair]

Dan Hitchcock Thank you!!

[@burrissa]

Excellent in depth video. I now know how to check for cause of failure and what failed instead of just replacing parts. Thank you.

[@KITS_Auto_and_Truck_Repair]

@burrissa My Pleasure!

[@phillipjlynch9340]

Best video I’ve seen on Cats so far. Awesome job. Thanks for sharing.

[@KITS_Auto_and_Truck_Repair]

Phillip J Lynch My Pleasure!! Thanks!

[@michaelgephardt5576]

Hey Deo, Thank you for sharing your knowledge with us. This is the first time coming across one of your videos. An yes I watched the entire video even rewound it a few times. This in my opinion is one of the biggest issues with todays cars. I’ve had my share of incorrect diagnosis by improperly trained want to be Mechanics. I knew there had to be some kind of correct corse of action other than guessing and throwing parts and customers money at it. Very informative video, I learned a lot. I see your here in Maryland. Hopefully I make the trip out to your shop someday and meet you directly. Thanks again, I’ll be watching. Your newest follower. Great Job!!!

[@KITS_Auto_and_Truck_Repair]

@michaelgephardt5576 My Pleasure! I appreciate you, welcome to our youtube community

[@abdoulazizdiagne]

Man, what a lesson. Thank you for sharing so efficiently the knowledge

[@KITS_Auto_and_Truck_Repair]

abdoul aziz diagne My Pleasure! Thanks

[@jacobkone7120]

Best mecanic ever seen.....you do your job with passion💯👏 You're a teacher, bro.

[@KITS_Auto_and_Truck_Repair]

@jacobkone7120 Thank you!

[@chrislittle6490]

Absolutely fantastic video. As you say, I want to address the cause, not just the concern. Now I know how. Thank you!

[@KITS_Auto_and_Truck_Repair]

Chris Little My Pleasure!

[@BearMD6571]

Fantastic overview of ruling out the potential causes for converter failure prior to replacement using the scan tool.

[@KITS_Auto_and_Truck_Repair]

@BearMD6571 Thank you!

[@robertoibarra3542]

excellent information. Thanks for sharing

[@KITS_Auto_and_Truck_Repair]

@robertoibarra3542 My Pleasure!

[@ronsmith9251]

Very thorough explanation, and very thorough diagnosis. Thanks for posting this.

[@KITS_Auto_and_Truck_Repair]

@ronsmith9251 My Pleasure! Thanks

[@castinn]

@ 27:17, you said, "the outlet temperature should be a lot cooler than the inlet temperature". I think you mean the opposite. The downstream side of the converter should be 100-200 degrees F hotter than the inlet because of the extreme heat generated in the converter due to catalyzing the NOx molecules apart. That is why the is extra heat shielding around the converter.

[@KITS_Auto_and_Truck_Repair]

Castinn Yes I meant the opposite!! the outlet should be hotter than the inlet, thanks for pointing that out!!

[@puneetbhatia2326]

I was about to point out the same and then noticed your comment. I suggest the author to actually change the section of the video.

[@guitarheadhunt]

I thought the same the outlet should be hotter by at least 100 degrees. What I noticed was that when you replaced the cats.the outlets were cooler than the inlet. So now I am confused. Before you replaced the cats, the outlet was the same as the inlet temp. After you replaced the cats, the outlet was cooler than the inlet.

[@borkganza9627]

@@guitarheadhunt I hear you! I’m dumbfounded. Also what about the graph on bank 2 sensor 2? It went erratic after the lean test.

[@kodiham7532]

@@guitarheadhunt I think if he would have taken more time (steady) to get an accurate temp reading it would have shown higher after. The reading was somewhat erratic and is a static reading. But he did a great job here I learned a lot.

[@lubacotemobile]

I love the way you go through the process of testing O2 sensor response by pumping the brake pedal. I have a -29% ST Fuel trim reading. Also a p0420 and a p0170 pending on a 2011 2.4L Sonata. No check engine light but driver said car struggled to accelerate. Once it got going it wasn't as bad.

[@KITS_Auto_and_Truck_Repair]

Lubacote Mobile Quick Lube you might have leaking fuel injectors or a bad regulator

[@lubacotemobile]

@K Diagnostics Thanks for replying. After re-check I realize it was ST fuel trim not long term (updating). Now a P0106 (MAP performance/range) is coming up in pending and actually turned on the check engine light after I filed and gapped plugs . I watched the MAP reading along with trim numbers. MAP readings did something funky a few times that correspond to idle and performance. It's on an 2011 Sonata 2.4L. Gonna clean throttle and intake, change oil replace plugs maybe a sensor. Then clear light. If I have to pull O2 sensors and check pre and aft-cat pressures if the p0420 rears it's head again. Then again those gdi engines burn through oil over time.

[@OFFICIALBROTHERBOLDLYMUSICTV]

@@lubacotemobile clear codes for the 420 code you can also put one gal of lacquer thinner in the gas tank on half tank And burn it through on/going highway speed After 100 miles or close to empty Refuel, fill tank with gas Drive 10 miles Check if code still comes up If this doesn’t work Take cat off Soak in 5gal bucket with Palmolive dish detergent overnight And clean If this doesn’t work than u need new cat Pray and praise and thank Jesus Christ for everything.

[@mwm749]

Hi, it's one of the best explained auto repair videos I have seen. Keep it up

[@KITS_Auto_and_Truck_Repair]

@mwm749 Thank you!

[@chrispolobatangueno3667]

Very well explained. I just bought a new scan tool autel mx808ts and I can now analyze the date accurately. I have a friend with the same trouble code in his kia grand carnival 2006. The car still runs good but the check engine light stays ON. I’ve been telling him it could be just a bad O2 sensor or worst will be a bad cat converter. Thank you for sharing this video. Cheers

[@KITS_Auto_and_Truck_Repair]

Chrispolo Batangueño My Pleasure!

[@meaculpamishegas]

Thank you for actually teaching how to analyze obd2 data, all other videos I’ve seen aren’t nearly as well explained as this

[@KITS_Auto_and_Truck_Repair]

@meaculpamishegas My Pleasure!

[@cjohnny8041]

This video was so beautiful I had to subscribe. Nicely done, you took your time but explained everything in detail great teacher all-some.

[@KITS_Auto_and_Truck_Repair]

C Johnny • Thank you!!

[@NasirKhan-vh9bg]

I highly appreciate the true professional know how, very logical approach and elaboration of each step and very easy to understand way of explanation. My salute to you brother. Keep it up 👍👍👍

[@KITS_Auto_and_Truck_Repair]

Nasir Khan Thank you!

[@adilfatah9129]

Man..!!!! I can t thank you enough. For this 👍 ..... the way you explaining I tell you right now you the best ever 👌.....thank you again...I'm going to subscribe now .

[@KITS_Auto_and_Truck_Repair]

Adil Fatah Thank you and welcome to our youtube community!

[@saulpena1035]

You're incredibly talented with a big intellect Maestro!🙌🏼 it was so detailed it deserves a subscription for sure, love it!

[@KITS_Auto_and_Truck_Repair]

Saul Peña Thank you!

[@yassinbey1356]

You are a legend. Im getting a P0420 code on my 13' Audi A4. Ive watched countless videos and didnt know where to begin. Now i know how i can go about diagnosing this problem. I was going to start with replacing O2 sensors before the cat. But thanks to your informative video i can now test before blindly going about changing parts. Thanks a million. You are a CHAMP! earned a new subscriber too.

[@KITS_Auto_and_Truck_Repair]

@yassinbey1356 Thank you! and welcome to our youtube community! good luck with your project!

[@gr2262]

Had the same issue (code p0420 bank1) on a 2000 Acura Integra but car ran perfectly fine. Heard about CATACLEAN and decided to give it a try as my mechanic said it was the cat that was bad. Poured in the entire bottle ($27.99 at AutoZone) when I had 1/4 tank left (per instructions) and drove it for about 100 miles. I noticed a boost in power right away but CEL was still on, I had to reset it and drive another 20 miles or so and when I checked with scanner again, all monitors were ready and no CEL. Took it to my smog station and passed with no issues. Great product which if it wouldn't have worked, this was going to be my next step.

[@KITS_Auto_and_Truck_Repair]

G R oh really!

[@gr2262]

@@KITS_Auto_and_Truck_Repair yes sir! I was very concerned thinging my cat was def gone even after using cataclean because the monitors would still show INCOMPLETE on the Cat, O2 Sensor and EVAP after the recommended 10-15 min drive the bottle specified. I guess some cars take a bit longer to react to the chemicals but mine took about 100-120 miles before all monitors cleared on their own. I have no doubt though the non fouler method will work as well but depending on the car, it can be a bit more invasive and time consuming than first giving cataclean a try...just my opinion though 😀

[@KITS_Auto_and_Truck_Repair]

@@gr2262 sounds good!

[@paulfoldes921]

your explanation speed is excellent you can be a good mechanic but to explain the way you do not too many mechanic can do thanks man im telling my friends watch K diagnostic

[@KITS_Auto_and_Truck_Repair]

paul foldes My Pleasure! Thanks

[@gemini291]

best catalytic converter video on KZbin! But that vehicle is sure a PITA to work on.

[@KITS_Auto_and_Truck_Repair]

@gemini291 Thank you!!

[@monsaka7827]

Yeah it is. Almost as bad as a turbocharged Subaru.

[@hadia1852dqt]

I sooo wish I saw this video before I let this shop replace my converter a week ago. My vehicle now sounds like a lawnmower since the aftermarket one they added does not seal properly. Amazing job explaining for someone like me who knows bare minimum about vehicles.

[@KITS_Auto_and_Truck_Repair]

@hadia1852dqt Thanks! I'm sorry about your car!

[@mohammadal-gebaly3046]

Thank U very much , U are very honest to explain every thing honestly , happy to watch your interesting videos , happy to get much information like that , you have nothing without interpretation for every things , God bless you friend , your sincerely from Egypt , Greetings

[@KITS_Auto_and_Truck_Repair]

Mohammad Al-Gebaly Thank you! I'm glad to hear that you're watching from Egypt!

[@pmgear]

brilliant explanation of how to troubleshoot O2 sensors, fuel trims and the brake pedal pump trick is epic, thanks for teaching us!

[@KITS_Auto_and_Truck_Repair]

@pmgear My Pleasure! Thanks

[@cfmpam498230]

Good Job !!! Very Complete Explanation of What the Problem was and Step by Step Process to Fix the Issue !!!

[@KITS_Auto_and_Truck_Repair]

Chris McKimie Thank you!!

[@jacobmiller5506]

Excellent , thorough explanation. Kudos to you sir!!!!

[@KITS_Auto_and_Truck_Repair]

@jacobmiller5506 Thank you!

[@dareldarel8826]

Great video. Wish you were here in Raleigh, NC. Keep up the great work.

[@KITS_Auto_and_Truck_Repair]

Da'Rel Da'Rel Thank you!

[@Christian.jsf1]

Thanks!

[@Christian.jsf1]

Oh and if the temp reading of the cat inlet and outlet was incorrect, please correct if you can!😆. This was an amazingly informative video..thanks so much!

[@KITS_Auto_and_Truck_Repair]

Christian Jordan My Pleasure!

[@KITS_Auto_and_Truck_Repair]

Christian Jordan It's a slip of the tongue, I meant the inlet temperature of the cat should a bit cooler than the outlet!

[@ecclissiass]

Excellent source of viable and understandable information specifically for this code. Thank you so much!!

[@KITS_Auto_and_Truck_Repair]

Michael Rowe My Pleasure!!

[@mackendw]

my 03 land rover disco 2 is throwing P0420 code (catalyst ineffiency on bank 1 (drivers side)). I did test using my autel 619 scantool as you showed on the video (great job btw)...and I see the O2 levels before / after the cat dropping when I pump the brakes so they are responding. What I've found though when doing a check for leaks in the exhaust is a large leak on the driver side cat at the pipe that enters it. They welded an angular shield on the pipe and on the cat to strengthen it from bending I guess. I believe the weld is compromised and leaking. When driving the rig and stopping, when you get out the heat that radiates on that side is VERY high...so the exhaust gases must be leaking from the cat there. It is not that loud which I would think it would be for this large an air flow leak. Next step is to have a shop inspect that cat more thoroughly. I don't have a digital laser thermometer with me to do the cat test however.

[@KITS_Auto_and_Truck_Repair]

@mackendw Cool, Good luck with your vehicle

[@mackendw]

@@KITS_Auto_and_Truck_Repair further analysis on the Bank 1 sensor 2 (rear O2) shows low voltage reading (~ 118mv). It holds pretty steady at that. Front one before the cat cycles up from around 870mv down to < 100mv repeatedly. The leak in the cat on drivers side must be causing the behaviour I'm seeing.

[@kaylamarie8309]

I wish all cats were this accessible. My Dad recently gave me a 2005 Chrysler Pacifica Touring SUV 3.5 and it has a PO420 bank 1 trouble code. He had the bank 2 cat replaced a couple of years ago. Car runs great, plenty of power and acceleration, tail pipe has pressure etc. but you can definitely hear the cat rattling when you give it some gas. I changed the oil in it today and that's really the only other issue I have found other than a routine tune up I'll do next week. lets my Silverado come off the road for some needed repairs at least. As always, great video!

[@KITS_Auto_and_Truck_Repair]

Kayla Marie Thank you! and Good Luck with your Pacifica!

[@kaylamarie8309]

@@KITS_Auto_and_Truck_Repair you're welcome Sir. Thanks, I appreciate it.

[@KITS_Auto_and_Truck_Repair]

@@kaylamarie8309 sounds good!

[@joesonl1610]

You are the best explainer in the case, Sir!

[@KITS_Auto_and_Truck_Repair]

Joe Son L Thank you!

[@viejowolf1254]

Gracias Amigo. Muy buen video. Pude aprender a leer los graficos del scanner para el codigo P0420. Los tips para diagnosticar y la metodologia para ir descartando los posibles problemas. Repito, MUY BUEN VIDEO!!. Tienes muchas condiciones de didacta. Te deseo toda la suerte del mundo. Continua con estos videos!! Vale la pena cada minuto.- Abrazo desde Argentina.

[@KITS_Auto_and_Truck_Repair]

Eduardo Bureau My Pleasure!!

[@appiahosei3595]

Sir you are too much i think you were born in to it great job i love spending all my deta watching you

[@KITS_Auto_and_Truck_Repair]

@appiahosei3595 Thank you!

[@humblerojo6300]

Just Thank You! Subscription earned! I hope you’ll continue to make these thorough teaching videos… and still get some work done.😉

[@KITS_Auto_and_Truck_Repair]

Humble RoJo My Pleasure!! Welcome to our youtube community!

[@bigarabenjamin3627]

Hope to be with you every time you are at the workshop. I can become a good mechanic too

[@KITS_Auto_and_Truck_Repair]

@bigarabenjamin3627 I'm sure! you will be!

[@local80g]

I really like the brake pumping to get the fuel trims to go lean. I have never seen that before

[@KITS_Auto_and_Truck_Repair]

local80g I'm glad to hear that the video was helpful!

[@barbaradeckert9642]

You should teach class...I learned so much from you. Well done

[@KITS_Auto_and_Truck_Repair]

@barbaradeckert9642 Thank you!

[@guilima1202]

Thank you so much for taking the time to record this video and share it with us. Like many have stated, it is one of the most comprehensive and easiest to understand videos on the topic! I do have a question regarding the scanner readings. Towards the end of the video when do your final checks with the scanner, while sensor 2 in bank 1 shows a constant signal (flat line), the sensor 2 on bank 2 shows some signal oscillation. What does that mean? Does it mean that sensor might be on its way out?

[@KITS_Auto_and_Truck_Repair]

Gui Lima that's ok, sometimes a little oscillation on one side for a minute is ok...

[@gabiladarlington1456]

You are such a good teacher.

[@KITS_Auto_and_Truck_Repair]

@gabiladarlington1456 Thank you!

[@11ccom]

Thorough explanation. Very good job.

[@KITS_Auto_and_Truck_Repair]

11ccom Thank you!!

[@richiesmith2292]

the depth of explanation is awesome! thanks

[@KITS_Auto_and_Truck_Repair]

Richie Smith My Pleasure!!

[@badr8b8t]

You my friend are one cool cat...alytic converter. I learnt so much from this video. I couldn't stop noticing how many times you said catalytic converter if full, where cat might have sufficed. But, your knowledge and generosity in sharing it let's you off in my book. Would have been easier to follow tho 😆 Keep up the good work brother. Watching and rewatching. Everyday is a school day. Oh and subbed. Top man. From Rob in UK. ✊

[@KITS_Auto_and_Truck_Repair]

bad robot Thank you very much! I appreciate it!!

[@Lilolemecp]

Best video explaining how to diagnose! Awesome job

[@KITS_Auto_and_Truck_Repair]

Chris P Thank you!!

[@partoems9376]

That is a great video. Is there software to help calculate outcomes by imputing the LTFT and SHTFT values?

[@KITS_Auto_and_Truck_Repair]

PartOEMS thanks! I don't know any!

[@OKBAOK]

I skip a little bit but, most of it I watched all the way. I have a 05 Camry that showing p0420 and p2423. Now I have more understanding what's going on in my car. Glad to know where to check and test. Also I'm glad I don't have to remove all the stuff in my kind of car🙂. Thanks! I will subscribe. Good video repair and teaching. Have a good one🙂👍🏻

[@KITS_Auto_and_Truck_Repair]

Okay-Ba-Okay My Pleasure!! I'm glad to hear that the video will be helpful!!

[@aros007z]

Excellent Instructional Video!

[@KITS_Auto_and_Truck_Repair]

Hungry Rabbit Thank you!

[@chahwahl.sakambwa6673]

You re the best technician god bless you.

[@KITS_Auto_and_Truck_Repair]

Chahwah L. Sakambwa Thank you!

[@worldpeace5853]

Hi K, Try to give your repair center location/address in the description in the videos. Most of the mechanics explain stuff but not in detail. Also, right now it’s important to show that you know what you are doing and earn customer’s trust which is important. You have a great video out there. I hope your hard work pays off and earns you a great reputation. BTW I also saw a few videos pouring gallons of lacquer thinner and driving upto 2500 rpm for 150 miles after erasing P0420 code. Do you recommend it as well? Do you still need to do EM/PCM reset? Lastly, you think you can put dielectric grease in all the screws just to be safe so they can come off easily next time? You can also edit and put a note in the video about the inlet/outlet temp correction for folks otherwise you will get a lot of comments again and again :). Keep the interesting videos coming!

[@KITS_Auto_and_Truck_Repair]

World Peace Thank you! I like your suggestions I appreciate it, No I don't recommend that stuff, it doesn't work

[@Mark.thy.Plumbr]

Hello I know this is old but just fantastic explanation! Wow great work my friend. Merry Christmas 🎄🎁

[@KITS_Auto_and_Truck_Repair]

@Mark.thy.Plumbr Thanks, Merry Christmas

[@joebriano6090]

Great job clear and concise info👍

[@KITS_Auto_and_Truck_Repair]

Joe Briano Thank you!

[@patharris4530]

Excellent video....I subscribed ....your good, very good....I have been an auto tech over 50 years, have seen miles of videos, this, is the best!

[@KITS_Auto_and_Truck_Repair]

Pat Harris Thank you!! I appreciate you!

[@gailjohnson6670]

Very detailed explanation video. I had no idea that so many parts removal and labor involved. Would be necessary to be removed. To get to the catalytic converters replacement. When I hear them being cut off and stolen in minutes by thieves. I have a 1996 Ford Crown Victoria V8 with a P O 430 code. Would this vehicle be as difficult for parts removal? How many hours of labor and parts cost was the vehicle you showed in the video? I wish I lived near you. To have my work done. You are a very good mechanic. Thank you for the video. New subscriber. Blessings to you.

[@KITS_Auto_and_Truck_Repair]

Gail JOHNSON Thank you!! removing catalytic converterts from your car will take 2-3 hours and the price will depend on how much the shop you're gonna take it to, charges per hour!! Good Luck!!

[@gailjohnson6670]

@@KITS_Auto_and_Truck_Repair Thank you for your reply. I subscribed and will watching more of your informative videos.

[@KITS_Auto_and_Truck_Repair]

@@gailjohnson6670 My Pleasure!! Thank you!!

[@nonyabiznizz]

Some cars have their cats farther away from the engine like underneath center of the car. Those are easier to get to and replace. Thieves can get to those vehicles cats easier plus they use a Sawzall to cut it out quickly. If you look underneath your car the catalytic converter comes before your muffler.

[@gailjohnson6670]

@@nonyabiznizz Newer cars have been made smaller for weight saving/fuel efficiency. With everything crammed into a tiny space. Not like the 50's/60's vehicles.. Hood and trunk compartments that were huge.

[@youtubecom-wn4er]

Thanks for this valuable information; That was a very net trick that you showed on how to check and see if the O2 sensors are operational:

[@KITS_Auto_and_Truck_Repair]

@youtubecom-wn4er My Pleasure!

[@juancarlosontiveros8700]

excelente video me he suscrito y mi like, saludos desde saltillo Mexico

[@KITS_Auto_and_Truck_Repair]

juan carlos ontiveros Thank you!! I'm glad to hear that you're watching from Mexico!!

[@juancarlosontiveros8700]

@@KITS_Auto_and_Truck_Repair Thankyou !! my dear friend

[@KITS_Auto_and_Truck_Repair]

@@juancarlosontiveros8700 My Pleasure!!

[@jonb703]

Very informative. You kept me watching. However, I need to point out that a properly working CAT should be hotter 🔥 at the outlet than the inlet. You over mention this incorrectly. I did think you are super thorough. Great job!

[@KITS_Auto_and_Truck_Repair]

Jon B Thank you for pointing that out that's what I meant!

[@Stelvio2022veloce]

Shouldn’t the outlet temp of cat be hotter than inlet?

[@KITS_Auto_and_Truck_Repair]

@anthonydegrazia7911 Yes! That's what I MEANT!

[@riuuku]

Awesome explanation 👏🏼 👌 👍 thank you for explaining things slowly and clear

[@KITS_Auto_and_Truck_Repair]

@riuuku My Pleasure!

[@bywayz]

Fantastic tutorial! I wish I had easy access to you. I had the expensive experience of two dealership techs tell me independently of each other that both of my 4Runner's cats had to be replaced (with associated sensors), only to determine correctly, on my own, that the problem was the fuel pump, not what they diagnosed. They relied too much on their diagnostic devices, and didn't go beyond that . I relied on my old-school experience, and got it right.

[@KITS_Auto_and_Truck_Repair]

bywayz I'm sorry about your bad experience at the Dealership, and I'm glad you figured out the problem!!

[@sumbamotor]

Wow Wow Wow!!! What a Master Class!! Thank You My Brother...

[@KITS_Auto_and_Truck_Repair]

@sumbamotor My Pleasure! Thanks

[@JB91710]

If you suddenly have codes popping up, ask yourself this. "Has my battery gone completely dead recently or did I change the battery myself" If yes, drive your car through the manufacturer specific, driving recycling procedure to re-boot your computer. A lot of things can be fixed by just idling from a cold start for a few minutes while turning on every electricity item in the car. AC, rear defroster, radio, lights, etc.

[@KITS_Auto_and_Truck_Repair]

JB91710 Yes!!