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

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

Any update on sensor you cleaned?

Me too lol

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

Lol read my comment 🤦🏿‍♂️

😂😂😂😂😂😂😂😂😂😂😂😂😂

good one

LOL

🤣🤣🤣

well said 👍

$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.

@@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?

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

I just found the bank 1 sensor for $40

🤣👍

Jajaja

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

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 😂

Dam same price as the SUV worth

Which o2 sensor worked for you?

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

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

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

But for how long

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

@@Eye-it-azz oh really

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Did it work for the silverado?

Lmfao!

Maybe all the alcohol you had last night 🤔

That's funny as shit,lol.

Savage 😝😂

🤣🤣🤣

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

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

😂😂

😂😂

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

yep - cat-a-LIT-ick

my caddy has a Cadillac converter

It's a catastrophic converter on your wallet.

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

jaden75 ?

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

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

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

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

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

Try cadi clean $26 pepboys

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

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

Did you ever figure out how to fix

@@jamesbroomfield7799 sold the car.

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

DIY

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

What does that mean ?

@@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

@@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

@@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

Poldariser how do u pass it??

@@LoeNateDogg ha good question, let say I got connections, I get around it.

LOE Nate he had to get on his knees a couple times if ya know what I mean

royalrod _ lmaoo I’m dead man

@@royalrod_ 🤣😂🤣😂

Of course it didnt

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

so you never changed he catalytic converter?

@@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

@@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..

Did it really help

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

I never clear codes only because it can present a false sense of victory. The best strategy is to leave the code and wait to see if the "fix" causes it to clear itself.

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

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.

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

Well my code came on and i changed all 4 oxygen sensors and the code was gone and now it came back on so maybe if i changed my fuel filter maybe that will work

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

Dakk O'day what is blinker fluid

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

I have code p0430 on my Honda, did it work for you???