FIX code P0420 with only $60 Toyota Camry P0420 catalytic converter code FIXED

[@mikesimone1]

2003 Camry 2.4L. Added the non foulers. Dorman - Help Spark Plug Non-Foulers - 18mm Gasket Seat 42009 part #. 9.99 at O'Reilly. Drill 1/2 hole through one (don't touch it right after--it is hot!!). I was worried the oil pan was a little close but it ended up fitting just fine. Screw it on top the second one and screw that into the hole in the downstream sensor hole. I installed both into the cat pipe and then screwed in the 02 sensor after. Easy to remove 02 sensor for me. Didn't need a special wrench--just sprayed a little WD-40, waited a few minutes and used a 22mm wrench to remove. On this vehicle easy to remove the plug for the sensor (it's just to the right and a little above the sensor) so it doesn't twist the cord to remove and install. Don't tighten the aluminum non foulers too much in the pipe--the pipe will win that battle. Drove for about 30 miles yesterday and no light (yet). Was doing it after 20 before. I'll put an update after more miles. Update Jan 2024. Has never thrown the code since and passed Colorado emissions.

[@Big_Country843]

Thanks for the write up on this. My son's 05 Camry just threw 0420 code. I watched a video on where the bank 1 sensor is for that car I noticed immediately how close it was to the oil pan. I was hoping that spark plug foul trick would fit.

[@maricallo6143]

I just remove and replace the EFI fuse on my 2002 Corolla which clears the code just before the inspection. It has always passed the emissions tests so far. I'll try some catalytic converter cleaner before replacing the sensor.

[@bokononisti2820]

what state? ECU should show smog not ready because code cleared.

[@JB-lq1rt]

I thought the 420 code is for bank 1 and that would be mean the up stream sensor ? But you switch the down stream maybe I should try that one mine

[@RBTheMechanic]

Up stream will give u lean codes even tho ur it’s used to monitor the conditions but mostly I have come to conclusion down stream effect most

[@JB-lq1rt]

@@RBTheMechanic Thank you I'm going to try switching my downstream to see what happens!

[@TheWilferch]

....if you have a 4 cylinder engine there is only 1 bank. If you have a V6, you have 2 banks ....each bank is 3 cylinders, Bank 1 and Bank 2. Bank 1 is the bank that has the #1 cylinder. In either case, you want to replace the downstream sensor of the cat...."sensor 2". So...if you have a 4 cyl engine....that would show as "bank 1 / sensor 2".

[@RBTheMechanic]

@@TheWilferch good information

[@TheWilferch]

@@RBTheMechanic .....👍👍👍

[@revert2theStr8path]

Does the bad sensor mean there is actually some problem in the catalytic converter? Or is it normal for this sensor to get dirty?

[@RBTheMechanic]

I had many many of these Camrys and accord sign came on due to bad sensor

[@fisherbrown903]

Is it ez to change 2012-2014 camry pcv valve. Not to take off the intake manifold off. Other way i found in youtube . From. Right tire Mr rb

[@RBTheMechanic]

@@fisherbrown903 nope

[@carlosarellano253]

Thanks for answering another question in the 2014 camry there are two oxygen sensors the code tells me bank 1 which one do I have to change

[@RBTheMechanic]

Bottom one

[@jonathanburgos2158]

@@RBTheMechanicyou are the best I’m subscribing to this channel

[@RBTheMechanic]

@@jonathanburgos2158 thank you!

[@jeffreyvasquez6042]

@@jonathanburgos2158did that get rid of the code for good?

[@619aldjdbjsksbh]

After installing an o2 spacer and clearing a p0420 code, the light has come back on. Advice ?

[@RBTheMechanic]

Space? That wount be good idea what was ur code?

[@619aldjdbjsksbh]

@@RBTheMechanic yes an o2 sensor spacer. P0420

[@ronaldayers7060]

What if you have replaced the catyletic converter, and both sensors, and still have the p420?

[@RBTheMechanic]

Did u check which emission ur vehicle was mad with and which emission converter u out in

[@revert2theStr8path]

Also would this also work for any make and model or only for the Camry? I have a P0420 code on my Nissan maxima 2011. I reset the code without doing anything and the light went off. Have driven about 40 miles since the reset and the light has not come back on. What could that mean?

[@RBTheMechanic]

Chances are it could be the possability so go for it worst come to worst u have to replace catalytic then u should replace sensors as well and u already did that

[@Flop1014U]

I got it done at the dealership. Now I’m thinking it’s the muffler and the other oxygen sensor. Since they’re the original , car has 290,000 miles.

[@RBTheMechanic]

Oh well blame it on them

[@Flop1014U]

My cat is new , oxygen sensor on it new too. So I’m guessing mine is the bottom sensor that’s old. I’m also getting a roaring noise on the floor and losing power. Could my muffler be clogged??

[@RBTheMechanic]

Yes and when u put in new catalytic did u check emission that ur car was built with and if u put in same emission catalytic

[@nathanaelgeorge6602]

I've changed both 02 sensors twice and replaced my cat and still am getting p0420 code on a 2011 Camry SE. No other codes.

[@RBTheMechanic]

Did u buy the parts according to the emission ur vehicle is made for?

[@MariaGonzalez-ei1pv]

Will o2 sensors n air fuel ratio sensor will make my service engine light come with a p0420. Or do they have their code?I have a 2002 toyota camry le,2.4 4 cylinder

[@RBTheMechanic]

They have their own codes also they can pop p0420 code they do input to ecm for preformance of cataltic

[@MariaGonzalez-ei1pv]

​​@@RBTheMechanichank you for replying 🙏 love warltching your videos, your #1

[@alejocalderon46]

Nice video, I have a 2009 toyota camry 4 cylinders, the CEL came out, I went to oreyllis for a free scan and a P0420 code came out, catalyst system efficiency below threshold (bank 1), does this video goes for this year too, do I have to replace the same sensor as you did with your car, or replace the catalytic converter and both sensors once for all for better performance, thanks.

[@RBTheMechanic]

For better performance yes all of it but if u want to take one step at a time start with sensor

[@alejocalderon46]

@@RBTheMechanicthanks

[@RBTheMechanic]

@@alejocalderon46 welcome

[@OKBAOK]

Hi, thanks for the video 🙂 I got 2005 Camry 119k, two days ago my Check engine light came on it’s P0420 so I put cataclean to clean the catalytic converter after 8 miles check engine light turns off, then after 154 miles check engine light came back ON again, then I put cataclean again until now the light still on. You think I need to change the second sensor ? after the first sensor in the exhaust manifold? Thanks for your advice 🙂

[@RBTheMechanic]

Replace the second sensor down stream

[@OKBAOK]

@@RBTheMechanic Ok thanks

[@c.p.5741]

​@@OKBAOKdid that work?

[@Beanyswiney2239]

​@@OKBAOK did it work because im going through the same problem now

[@Star88701]

​@Beanyswiney2239 did you find any solution? Same issue here in 08 camry. Originally was getting P0031, replaced upstream o2 sensor with oem sensor and am now receiving P0420.

[@FranciscoGonzalez-ou4jv]

Thanks for the video. I replace 2 sensor but I got the Engine Light for the same reason , with the code P0420 , any idea what else could be ?

[@RBTheMechanic]

It might be time to replace it

[@FranciscoGonzalez-ou4jv]

@RBTheMechanic ok thanks you so much

[@markt6411]

I received the same code P0420 on my Camry with 260K miles. I used Cataclean on a 1/4 gas tank and drove it to almost empty. You can refill the gas tank with a premium or regular with octane booster. You must drive at least 200 miles at 60 mph to reset the drive cycle. My check engine code cleared doing that.

[@frankmontez6853]

I’ve 11 LE 2.5 L and I got this code . Auto Zone and OReillys both recommend cc replacement. Not sensor . Do you know if this car and mine are the same? The sensors are in same location? Would you recommend this possible fix for my 11 Camry LE ?

[@RBTheMechanic]

Well of u got code for it someplace the sensors with it or start with sensors first cuz I had many p0420 codes and just replacing the cc and code came back so it was faulty sensor

[@tdatilma]

Great video! Thanks for sharing. My 2003 Camry takes a lot of crankings to stay running. It runs for about 3 to 5 seconds, then stops. Eventually, it stays running. I have a P0420 . Could this be the reason it takes a lot to stay running? Does anyone know? I was thinking about replacing the sensors. Let me know. Thanks

[@RBTheMechanic]

Not sure it can be somthing else but this can cause engine to choke

[@tdatilma]

@@RBTheMechanicthank you

[@alexweatherby9071]

2007 Toyota Camry LE 2.4L. I got a P0420 code also severity 2/3. Is this the only sensor I need to replace, or should I also do the one on the top of the engine? Or just change out the whole cat?? Thanks!

[@RBTheMechanic]

First do the bottom give it a chance see how it performance after that also add some catalytic cleaner to fuel

[@Byjulie328]

Do you recommend using the Emissions system cleaner first or just changing the sensor

[@RBTheMechanic]

Yes

[@felixalvarez6460]

I got the same code, it failed emissions test in Georgia, hard to find mechanics here. 2004 Toyota Camry, is the sensor located in the same spot, I'm willing to do it myself 🥺

[@RBTheMechanic]

Oh ok

[@RBTheMechanic]

2004 is about same I think so

[@tigrayfirst2261]

First the water pump broke down and all the coolant flashed and i fixed that but a few days later, the engine light came on but i ignored it until i couldn't accelerate anymore. Its different to go right away after i make a stop at a stop light. I took it to Toyota dealer and they told me to change the exhaust Manifold. Do you think i should change the downstream sensor before i change the manifold? Since the water pump is near the sensor and when if the mechanic hit it accidentally. Anyway thanks for the video.

[@tigrayfirst2261]

I forgot. Every time I try to accelerate, cylinder 4 misfire. Plus I get p0101 code as well with P0304.

[@RBTheMechanic]

What code do u have?

[@RBTheMechanic]

Those are cylinder misfires replace coils and plugs

[@tigrayfirst2261]

Ok thanks. I change my spark plug today and I just passed emissions test but it still hard to drive up the hill. I am gonna change my upstream sensor now see because its impossible to get exhaust Manifold here in Colorado. To much regulation. I had P0420 but now I will see what code I will get when the engine light comes back.

[@RBTheMechanic]

@@tigrayfirst2261 might be blocked catalytic

[@frankmontez6853]

Just one sensor replaced? How do you know it’s this or that sensor? 11 Camry LE 2.5 L

[@RBTheMechanic]

U don’t no code for it. Ut before spending 1000 on catalytic I would do sensors

[@frankmontez6853]

@@RBTheMechanic what you mean? I’ve got the P0240 code . But try cataclean or replace downstream sensor before trying cc replacement?

[@obs_vell439]

So I changed mine, reset the light and my CEL came back on. 2011 Camry SE.

[@RBTheMechanic]

Did u change upstream or down stream?

[@obs_vell439]

@@RBTheMechanic downstream. I used a walker o2 sensor from rockauto. I did just as u did in your video.

[@RBTheMechanic]

@@obs_vell439 ok cool well maybe it’s time to replace catalytic converter if u do replace the catalytic replace upstream sensor also it’s for the best preformance

[@obs_vell439]

@@RBTheMechanic came back to mention, my '11 camry was shutting off, dash lights flickering. So I changed the battery/alternator then my CEL came on. It wasn't on before. So I wonder could I hve done something when I changed the parts

[@RBTheMechanic]

@@obs_vell439 which part u changed? And cel?

[@absbse]

I don't understand why didn't you lift the ramp up fully is there a reason for that ?

[@RBTheMechanic]

I believe is safty and safty first no need to go sky high that’s for lazy people who want to work like stand u set the car

[@JuanA-r1d]

@@RBTheMechanicI respect that, you can do whatever you want anyways it’s yours

[@montrose5paulina]

On my 03 Camry, it started with the P0420 code. I replaced the cat and code cleared and the stupid code P0141 appears, so finally I replaced the pigtail and all good. Now the stupid P0420 code is back and I tried the sea foam. What the hell is going on??

[@RBTheMechanic]

Did u use denso sensor

[@montrose5paulina]

@@RBTheMechanic yes but only after I replaced the pigtail, the light cleared and now the code P0420 appears and that’s what started it all.

[@hv.x10]

I have a check engine light or the engine light is on. I checked the computer and the oxygen sensor said it was 1. I dismantled it and cleaned it with a spray bottle and it worked. I changed the oxygen sensor, a used one, from another car. The same problem. The light did not turn off. The computer says the oxygen sensor is working properly and is working. It reads: Is the problem with the oxygen sensor or not? From the bear of the environment or the bear of pollution called a lot of bear. Does it need cleaning in carbon or should I change the sensor? New car model Corolla 2015 code (p0420)

[@hv.x10]

Do you need cleaning with a spray or catalyic converter solution? Or is the oxygen sensor a new, sad change? I don’t know the solution

[@hv.x10]

Did you replace the sensor? Did you not turn off the engine?

[@RBTheMechanic]

Replace the craaltic

[@RBTheMechanic]

Start with sensor

[@hv.x10]

@@RBTheMechanic I replaced the sensor and checked the computer. The sensors read correctly. Is there a substance or spray to clean the tank from carbon? The engine light did not turn off. I did the programming on the computer and it did not turn off the engine light. What should I do, brother?

[@sage2163]

I tried this on my 2014 toyota camry le 2.5l, and it only worked for a day then the light came back on. What is the next step? Do you think it might be the other sensor? Thanks!

[@RBTheMechanic]

Did u replace down stream oxygen sensor

[@sage2163]

Yup

[@RBTheMechanic]

@@sage2163 type sun fuel additives other wise need replacement

[@sage2163]

Which one do you recommend?

[@RBTheMechanic]

@@sage2163 I use walker lot

[@rafaelreyes2007]

My camry 07 has 309k is better if i replace my cat or o2 sensors?

[@RBTheMechanic]

Replace stall tic and sensors

[@ashleyrodriguez6289]

I have code 420 how kiddo I know if it is the o2 sensor or the cat??

[@RBTheMechanic]

It’s the catalytic converter but I would recommend u replace down stream sensor before replacing catalytic

[@senatoraguolu4773]

Please i currently have a PO420 in my Toyota Camry 2009. I am in Georgia. What do i do? I wanted to change the oxygen sensor on bank one and i was told it's the catystic converter on Bank 1 not the oxygen sensor. What do i do?

[@RBTheMechanic]

Start with sensor of it dosent work out the both

[@senatoraguolu4773]

@RB The Mechanic Thanks for the quick response. One more question do you do think using a catalystic cleaner is going help?

[@RBTheMechanic]

@@senatoraguolu4773 it might it’s all a chance

[@senatoraguolu4773]

@@RBTheMechanic Thanks.

[@RBTheMechanic]

@@senatoraguolu4773 welcome

[@lokato02ng]

This video was good helps me a lot

[@RBTheMechanic]

Glad video was help

[@zwxwvutsr]

Is that the downstream sensor?

[@RBTheMechanic]

Yes down stream

[@carlosarellano253]

Hello friend, I saw your video, I have a question, I have a 2014 Camry and the code P0420 came out (catalyst system efficiency below threshold bank 1) is it the same as what you recommend in the video?

[@RBTheMechanic]

Yup same try the oxygen sensor replacement and reset the code if it comes back then u will need to replace the catalytic

[@carlosarellano253]

@@RBTheMechanic Thanks for answering another question in the 2014 camry there are two oxygen sensors the code tells me bank 1 which one do I have to change

[@TheWilferch]

@@carlosarellano253 ....if you have a 4 cylinder engine there is only 1 bank. If you have a V6, you have 2 banks ....each bank is 3 cylinders. Bank 1 and Bank 2. Bank 1 is the bank that has the #1 cylinder. In either case, you want to replace the downstream sensor of the cat...."sensor 2". So...if you have a 4 cyl engine....that would show as "bank 1 / sensor 2".

[@fred3370]

Would this work on a 2009 toyota Camry hybrid?

[@RBTheMechanic]

Not sure that’s is ultra low emission

[@okayyokayy7015]

2003 Camry I was quoted 500. For this problem

[@RBTheMechanic]

We’ll do it ur self

[@theglamorousdon1254]

This will work for a 2011 Camry ?

[@RBTheMechanic]

No 2011 is diffrent but similar process

[@frankmontez6853]

@@RBTheMechanic how is it different? Sensors are different locations but you change downstream sensor and that might fix it ? I used cataclean and I disconnect negative battery cable and light stayed off for about a month. Instead I I should replace downstream sensor? 11 Camry 2.5 L

[@m7madfardos581]

Hi sir where’s your store location

[@RBTheMechanic]

Nj Bayonne

[@XxelmokillerxX1]

Will this work on my 02 Camry?

[@RBTheMechanic]

Diffrent set up

[@XxelmokillerxX1]

@@RBTheMechanic damn bummer

[@saeedsaleh6784]

I have this code Without check engine light

[@RBTheMechanic]

Turn the car off take out the key. And then put the key ok and turn the key to accessories do not start the engine. Let me know if ur check engine light is on

[@saeedsaleh6784]

@@RBTheMechanic no light bro I Tried

[@saeedsaleh6784]

@@RBTheMechanic The car consumes high gasoline

[@srourrrrr]

Hello dear I have many code can help me 😊

[@RBTheMechanic]

Sure send me the codes year make and model

[@krasimirivanov2033]

Again problem p0420

[@RBTheMechanic]

Replace it