p0420 Catalyst System Efficiency Below Threshold

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Hi everyone, Oscar Gomez here from Master Automotive Training! In today's video, I'm going to walk you through the P0420 Catalyst System Efficiency Below Threshold Bank 1 code and how I determined the catalytic converter was faulty using a scanner.
We'll also discuss the P0430 code, which signals a similar issue in Bank 2. I'll share my personal approach to diagnosing these codes, including checking for exhaust leaks, inspecting oxygen sensors, and evaluating the catalytic converter's performance.
Join me as I take you step-by-step through the process, helping you understand the ins and outs of these error codes and what they mean for your vehicle.
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Опубликовано:

14 июл 2024

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Комментарии : 70

@baja-automotive 11 дней назад

Great job! I’m going to steal this explanation for my channel

@MasterAutomotiveTraining 11 дней назад

Go for it! Just pass on some recognition 😉

@Sean_Diagnostics 12 дней назад

great explanation! I would also check the spark plugs on wear. I once had a p0420 and did a test on the gas analyzer. It passed the test, so i checked the O2 sensor and noticed sensor 1 (air/fuel) switching alot and also the O2 downstream. I went on and checked spark plugs and they were pretty worn. I changed the spark plugs and did a reset of adaptive values. Since then i always check the spark plugs to be sure the computer is not compensating for worn spark plugs

@MasterAutomotiveTraining 11 дней назад

Thank you Sean, you are correct, its always a good ideas to use a scope or visually inspect the secondary ignition system, to prevent carbon fouled cat.

@MattHerold-pv8qb 12 дней назад

Great video Oscar! Love your explanation of examining the root cause. Seen many shops load the cannon without any further evaluation. Misfires and fluid consumption are the main killers of catalysts. Also, amazing what's capable with dongle and a phone!

@MasterAutomotiveTraining 11 дней назад

Hey Matt, thank you for your kind words. Sadly to many shops and techs will just throw parts without first analyzing whats the root cause. I highly recommend the topscan, very powerful tool.

@Jursaw 11 дней назад

This taught me a new way of testing cats. Thanks for taking your time for sharing your knowledge with us!

@MasterAutomotiveTraining 11 дней назад

Glad it was helpful! Thanks for watching.

@baja-automotive 11 дней назад

For my P0420 tests I also like to compare the reaction time of the upstream 02 against the down stream O2. I mainly work on Toyota and Subarus (which use AFR for the upstream). 90% of P0420 codes (I encounter) are related to a slow reacting upstream O2 and /or bad spark plugs

@weldingjunkie 11 дней назад

Nice job Oscar. I was just trying to explain to somebody the other day about this being a pro tool versus a non-tool. This does keep up with even the highest end scanners. You cannot beat this for the money.

@MasterAutomotiveTraining 11 дней назад

Thank you my friend. I always say gear doesn't buy skill lol. Im very impressed with the topscan and I tell everyone its my techs go to tool.

@alexreis5530 12 дней назад

I think I got it …it’s little be advanced for me ,,,I gonna study it more ..Thanks again appreciate

@MasterAutomotiveTraining 12 дней назад

You got this! Look it over once again, and test it out!

@rickybailey7123 10 дней назад

U did a hell of a job showing how 2 do it if anyone says it was bad they have no idea about cars truck or for that matter any thing They're just r***** thanks again !!

@MasterAutomotiveTraining 10 дней назад

Thank you for watching my brother and dope comment!

@MarzNet256 10 дней назад

Cool. I had an intermittent P0420, which turned out to be an exhaust leak at the Manifold donut gasket. Worn engine mounts also added to the leak. A new gasket and mounts fixed it (use OEM for these). Downstream O2 sensor was reading lean. Car is a 2006 Matrix 4WD with 225k miles.

@MasterAutomotiveTraining 8 дней назад

Very nice! That's a common issue, great catch. Thanks for sharing this helps other Incase they run into a similar issue.

@kellygibson7299 11 дней назад

Great vid man. Just found the channel

@MasterAutomotiveTraining 11 дней назад

Welcome aboard! Thank you for watching.

@AAB371 12 дней назад

Good explanation. Keep the videos coming

@MasterAutomotiveTraining 11 дней назад

Thank you for watching more to come!

@ysitrim88 11 дней назад

Yes more technical videos!

@jdubjdub645 17 часов назад

Hello! Love all of your lessons and have helped me with ase tests. Was wondering if you had an ase 2 automatic transmission course…

@robertmobileman8304 11 дней назад

good job man , thanks

@MasterAutomotiveTraining 11 дней назад

Glad it helped, thanks for watching.

@lukeschlabach4992 12 дней назад

Great job man

@MasterAutomotiveTraining 11 дней назад

Thank you for watching.

@Freddybangout 11 дней назад

This was good. Thanks.

@MasterAutomotiveTraining 10 дней назад

Glad you enjoyed it!

@bettowin 5 дней назад

Great informational video. My 2005 Honda Civic has the same code and from your video I realize my CAT may be toast due to a very small head gasket leak that likely caused the CAT to overheat due to the coolant and tripping the code. 🤞that it's the O2 instead.

@robertfrancisco1193 11 дней назад

good job Oscar!

@MasterAutomotiveTraining 10 дней назад

Thank you for watching!

@codyshaylyn 9 дней назад

Great content as usual

@MasterAutomotiveTraining 9 дней назад

Much appreciated,thank you for watching.

@ysitrim88 11 дней назад

Very good info my friend!

@MasterAutomotiveTraining 11 дней назад

Glad it was helpful! Thank you for watching.

@ysitrim88 11 дней назад

@MasterAutomotiveTraining Np and i subscribed to your channel. 😎

@nickayivor8432 12 дней назад

Oscar Gomez Master Automotive Training Enjoy your 4th of July with all your family around you Brilliant video tutorial outstanding 👍 WHIP SMART, Oscar Gomez Master Automotive Training From Nick Ayivor from London England UK 🇬🇧 ⏰️ 7:04AM Good Morning 🌧 and more 🌧

@MasterAutomotiveTraining 11 дней назад

Thank you my friend! Your support is amazing!

@hoaxs1939 6 дней назад

Thank you for covering MODE 6. 😤

@mikedavidson2117 10 дней назад

Hi do you believe in using a digital laser temp gauge the one you point or a infrared camera with temperature readings

@MasterAutomotiveTraining 10 дней назад

It's a good method or even using a thermal imager, you just need to test many known good cars to have an idea of what's good vs. what's bad, to then apply to your diag.

@Djc244 11 дней назад

Hey I had a Tahoe with a returning P0420 code, previous techs had replaced cats twice on it, I got it and could not condem the cat, but they wanted me to put another cat on. Code returned. Later found that coolant temp was only getting up to 180F now matter how long it ran. I put in a resister to the coolant temp connector and verified computer could read 200 degrees, it was able to, tested the coolant temp sensor and found according to the temp to resistance chart. Also passed, so I recommend thermostat customer declined and left. My question is, if coolant temp doesn’t not get up to temp how can that effect just one bank and cause the p0420 back? It’s driving me nuts lol

@JOHNPHUFNAGEL 10 дней назад

I can't see how a coolant temp issue would cause a single bank issue. was it California emissions, possible that you were using the wrong cat? is it oem cat? I have seen new aftermarket cats set 420 code

@Djc244 10 дней назад

@@JOHNPHUFNAGEL yes I checked all of that,it was an aftermarket cat, but the last two were OEM.

@MasterAutomotiveTraining 10 дней назад

It's called time to temperature. On my previous video of the 3 PIDs I speak about it. If the ECT takes too long to warm up the monitor won't run or run at the wrong time causing a false DTC. You can also read that same info in service info it's part of the code setting criteria. Great catch.

@Djc244 10 дней назад

@@MasterAutomotiveTraining holy shit must have missed that. I sincerely hate a vehicle leaving that was not properly diagnosed. I NEED it fixed. Thank you.

@robertholmes2295 8 дней назад

@@MasterAutomotiveTraining I'm currently using HP Tuners to do the same tests, but the supported vehicles are limited. I did notice on a 2014 Silverado with a 5.3 L83 with a bad thermostat that almost all emissions tests fail to run until the target coolant temperature is reached. I am assuming that most systems are the same. Do you have an affiliate link to the scanner you are using? dragging a laptop out to diagnose is very cumbersome, and a huge pain in my ass.

@mechanicmike311 12 дней назад

Have you had a new car block you out of the system ? You can pull codes but no live data ,no bidirectional just Codes.

@robertmobileman8304 12 дней назад

It must have asecure gateway man

@MasterAutomotiveTraining 11 дней назад

Not yet, you'll need to get your scan tool registered with Autoauth and also get your VSP for the new changes.

@rommeltolentino5954 8 дней назад

2005 Toyota Corolla le, brand new 02 sensor upstream and downstream, brand new catalytic converter CARB California, brand new battery, brand new spark plug,anyway, no codes and always not ready the O2 sensor i failed in the smog check. Drive cycle is like 2000 miles now.

@rick343 10 дней назад

Clicked on the video hoping to get some insight on my wife's 07 Honda Accord, been getting an intermittent po420 for 5 years, the cats aren't cheap for these cars, so I'm glad I didn't break down and get one at the first sign of the po420, car runs great, haven't had any other trouble codes, just don't understand why or how this code pops on for awhile, only to go back off for awhile, if the cat is on its way out, why has it kept doing this for 5 years, I just don't get it

@MasterAutomotiveTraining 10 дней назад

You're suffering from a weak cat. During the entire video I explained how to test it to know if it's the cat or an input sensor. If you follow the same steps you'll be able to determine the true cause. Curious what type of insight did you expect to see?

@rick343 4 дня назад

@@MasterAutomotiveTraining I was hoping to understand why her car has had the intermittent 420 for so many years, I guess I did get some insight, I just didn't think that a cat could remain in the weak stage of it's life for so long, thought that maybe there is a problem I hadn't heard of yet, meant no offense to your video, you obviously know what you are doing, and I always like to listen to everyone's perspective, every time her engine light comes on because of the 420, I think is it finally going to go out, but after years of this, you begin to wonder, is there something going on I'm not aware of, I reckon it's just living on the brink.

@s3vR3x 6 дней назад

Hey man, do you have a shop where you do smog diagnosis? I am local to you and i have been playing parts cannon with my 94 jeep 4.0 for 15 years. im about to throw in the towel. Id love to see if you can diagnose.

@MasterAutomotiveTraining 6 дней назад

Of course man, we are Master Auto Care. 9233 Archibald Ave., Rancho Cucamonga, CA 91730. 909-493-1855, give us a call to setup an appointment and we can definitely help you get it fixed.

@ottoantonionolascoestrada1813 11 дней назад

You can run on some toyotas the cat monitor , zero mph

@MasterAutomotiveTraining 11 дней назад

At idle?

@mr_mnky 10 дней назад

Wouldn't negative fuel trims indicate that the car is decelerating, since the pcm is removing fuel instead of adding it?

@MasterAutomotiveTraining 10 дней назад

On decel it goes into OL-Drive and trims aren't being monitored by PCM.

@frankwrenchman4573 8 дней назад

Data data data 😊

@MasterAutomotiveTraining 8 дней назад

Coming up! 😃

@caseyparkhurst226 2 дня назад

I have been having problems with My 2018 Hyundai Elantra Chacon SEL with a PO420 Code. I have been trying to fix the problem and clear the code so I can get it fixed so I can sell the car. The car has 225,000 plus Miles on it. When I bought the car 2 Years Ago, it had 86,580 Miles. I am the 3rd Owner on the car and I drive for Uber.

@ibrahimwaheed987 11 дней назад

Comparing it with Phoenix Max is not correct

@MasterAutomotiveTraining 11 дней назад

All the knowledge in this video yet, you focus on that comparison, well ok. Good to know.

@user-kt5lz5tj2l 5 дней назад

@@MasterAutomotiveTraining😂😂

@bakryahmed9178 11 дней назад

Bla bla bla for five minutes, and you haven't started explaining the code yet.

@MasterAutomotiveTraining 10 дней назад

Well, I started explaining the proper process at :50, I believe you wanted a video saying replace this part for this code. I'm not a parts changer and don't teach that, since that's what you want, I'm not the channel or teacher for you, best of luck with parts changing.