How I Figured Out Exhaust Restriction (Clogged Catalytic Converter)

[@ShahidVelji-uk1bz]

Hey I wanted to say thank you very much for this informative video. I have been dealing with this check engine light in my vehicle and every videos I see they say the same thing “it could be a bunch of things but most probably it’s your catalytic converter”, but you are the first person who actually takes the time to show what a clogged catalytic converter looks like, and from this I now understand why check engine lights can be thrown. Thank you very much this was very helpful and informative.

[@Rakki_Haitatsu]

Something that alot of catalytic converter videos won't tell you is that when you have two catalytic converters as opposed to one, you're going to have different symptoms. Check both cats with a laser heat gun and check temps at both front and back of cat underneath the heat shield. If there is less heat on the back side than the front, Chances are it's clogged

[@rezagrans1296]

🇯🇵؟ greyshus uv yuuuuu s.iiii..ır/misdur

[@ΓιώργοςΜιχαλακης-β8κ]

Question I got one cat and it's always flaming hot when you drive for more than 15 minutes and it feels like it's clogged

[@mikehoncho9344]

Good idea ty

[@kylefowler5082]

Great video, I wanted to add an early sign of cat problems can also be cylinder misfire codes. My poor friend replaced his coil packs twice before he figured out the cats were falling apart when the car couldn't do anything more than idle before dying!

[@ABCDEFGHIJKLMOPQRSTUVWXYZ12345]

I lost a car like this, also bought the coils lol

[@panzerfaust5046]

I have literally replaced everything besides my (most likely) exploded cat. Finally called a shop today and they told me that my symptoms are engine related, over the phone. Yeah bro, the jar of marbles stuck in the center of my car is what's making all the noise.

[@robertbritt3129]

Same

[@moemoe0032]

Bruh same

[@julianhart2247]

This makes so much sense I did a whole tune up on my car myself ran good for about a month and started losing power again. Flooring it couldn’t get me to 50mph. It’s still running but wish I would’ve known before wasting my money

[@andreyzagoruyko5390]

Neat, haven't seen a video yet where it's all apart and in pieces to see; very valuable thank you!

[@jinglesalas]

I just discovered this exact thing on my 2001 toyota sienna xle. Engine power was nearly non existent. Removed the front wideband sensor and power returned. Separated the exhaust right before the final catalytic converter and the same stuff you showed in your video fell out. I knocked it all out of there and reconnected everything. The van has very good power now, and it has not thrown a CEL yet. Kinda strange. BTW, I have over 350,000 miles on this van.

[@BarboursAutoHelp]

Glad you at least got it somewhat figured out.

[@lasers4less]

Great Detective work. Thanks for posting this.

[@wilborth5th]

Now this is a great video, I see people including myself looking for vacuum leaks everywhere and sure enough never to be found, and then is the pipes that are full of debris from cats converters, unbelievable, thanks for sharing

[@Baghuul]

I got vaccum leak code pop up, couldnt find the leak. Turns out its the catalytic converter

[@Edwardlive]

My mechanic did the same exact thing just to find out why my car was constantly jerking. I love this mechanic 💯💯💯💯💯💯💯💯

[@jookiva]

This video helped alot especially the trick to remove the oxygen sensor to see if your pipe is clogged or not! Thank you!

[@BarboursAutoHelp]

No problem

[@TomBuikema]

THANK YOU SO MUCH. I changed everything on my car trying to figure out why my acceleration and top rpm sucked. Your video is the only one I found that illustrates the same engine behavior that mine had.

[@devinbagley6895]

Did you have any check engine codes that led you to replace the other stuff first?

[@Anon_Fox]

@@devinbagley6895 no did you?

[@2000jackben]

​@@devinbagley6895My Trailblazer didn't throw any codes even though I couldn't get over 40mph. It also had trouble going into 3rd and Drive and it had no power when I accelerated. I had to limp home at about 15 mph. I pressure-tested it with my compression tester and my hose melted off. 😢 oops.😊

[@MrSupercar55]

I got this issue on my 07 Miata. Sluggish acceleration. However, downshifting so the engine surpasses 5,500 rpm usually fixes things.

[@YaaShooYaa]

What tube? My TB is having this issue​@@2000jackben

[@joesmith201212]

finally a video that says top just stick a bore scope in and a visual inspection will give you the most accurate and definitive way to diagnose the problem, open the the O2 sensor ports and snake a cam inside with light and that would be the most definitive and easiest sure way of looking at the problem.

[@bootneylee9802]

Thanks again. This is definitely my problem with the 02 Tribute. I've blown 2 egr valves apart now. Gonna unplug the o2 sensor and run it till I can find a cheap cat.

[@davebarajas5308]

It appears that your exhaust pipes had honeycombs for breakfast. Nice video

[@Rts-slots]

😅😅😅

[@dianeprice1153]

Thank you thank you for your video just confirms what I knew was going on with mine the same thing in my 06 Dodge Charger you just save me a lot of money you saved me from getting a motor

[@anthonybrown3481]

Thanks for the video. Very very useful info.

[@servihomestead4324]

Very helpful and well-done video. Thanks for sharing. I'm about to try this on our 09 Nissan Quest.

[@BarboursAutoHelp]

Thanks

[@tauruscarclubphoenixaz1425]

Wow right on point!!! I had boulders falling out along with some coal it looks like charcoal but runs wwaayy better now mind my car has 300k on her and of course is a taurus has pep in the step now and my rpms ain't shooting up after launching

[@Jhernandez898]

“that was the rev limiter right there” 😂 got me rolling over here.

[@BarboursAutoHelp]

Oh.. was that funny?

[@Super122891]

@@BarboursAutoHelp I don't think he know much about cars 😬

[@HeyLanny]

Very good and appreciated. My 2004 Jaguar XJ8 started acting up last summer. With accelerator pushed to the floor I am only getting 2000 RPM. On the road it would not go over 40 miles an hour. I first tested the fuel pressure and it showed 55 lbs, but replaced the fuel filter anyway as it was 9 years old. That did not help. I have had fuel restriction on another car several years ago. I am even more now suspecting it is the catalytic converter that is suffocating the engine. I have 92,000 miles on it and keep it in the garage most of the time as I consider it my 3rd classic car. I am waiting on a new car lift for my garage and I can then remove the converter and test it removed or test it as you did by just removing the sensor. I know you can also drill a hole in front and back of the Converter and use a special tester that gives you the pressure reading at both ends. Usually used in commercial garage as a time saver. But since I will be under there I will just disconnect the converters, start it and see if it will go above the 2000 RPM . If so I may post one of my own here on KZbin.

[@BarboursAutoHelp]

Right on! Hope you get it fixed!

[@2000jackben]

I know this is really late but if you just remove the oxygen sensor before the cat. and take a drive it should drive close to normal because you're releasing the back pressure if the cat. is clogged.

[@daltonhurleybmx]

I have a 2004 Honda accord coupe v6 6 speed 297,000 miles , lost all power but was still drivable , coils , spark plugs were fine , watched this video and just did my exhausted yesterday and it fixed the problem btw my car was also throwing misfiring codes on all 6 cylinders

[@daltonhurleybmx]

My cat was glogged !!

[@daltonhurleybmx]

Clogged **

[@BarboursAutoHelp]

I’m glad you got the issue resolved! Good job.

[@oby-1607]

I have a 2008 Escape with the 3.0 engine. I will be checking the back cat and probably may have to clean it out. When they melt like that, I don't know how the engine can breathe. Thanks for sharing.

[@alisha75006]

This is excellent info, thank you !

[@BarboursAutoHelp]

My pleasure!

[@therockwhispers]

Thanks for your video. I had water in my catalytic converter and a lot a honeycomb I was wondering what causes them to go bad this was less than a year old?

[@doctorofparadox4469]

Keith! Cool Channel. I believe that I have a restriction in the same place on my Lexus Rx 300.But, I used an infrared thermometer to check temp differences on various exhaust system components. The temperature at the entrance to the third cat (primary muffler), was >600F:whereas nothing else on the exhaust exceeded 400F. Iv'e changed everything myself and the truck still bogs down upon acceleration with random misfires throughout - no specific. Doesn't seem to have any exhaust leaks, but I'm about to create one by pulling the rear O2 to see if it runs like normal - slightly louder though. I saw you video then I saw you! Fantastic. - Keep in touch - Greg Totty

[@BarboursAutoHelp]

Hey Man! Small internet. I hope you get it going. Good to hear from you!

[@steveblottenberger1097]

Good job partner you were very feral and you can understand you keep up the good work I got the same problem with my Nissan Pathfinder bogging down take the exhaust apart and check it

[@heroknaderi]

This is great advise thanks.

[@mohammedgangat5799]

Remove the cats and muffler so the fumes escape freely and any honecomb remains from the catalytic converter will come out your tailpipes after a few days (obviously depending on where you stay and the laws there regarding noise and emissions)...

[@zephyrguzman6462]

Remove the muffler and cat??????

[@tranquilityaphelion8144]

@@zephyrguzman6462 disconnect the exhaust before the cats

[@bethbonnett7355]

Incredibly informative and helpful video and description. Thank you so much! You happen to be in NY?

[@BarboursAutoHelp]

Thanks for the comment. No, I am not currently in NY.

[@ahmedalimian9597]

Well, I can bet that by passing catalytic converter (removing it away) brings better acceleration and more mileage to such cars in which O2 Censors are fitted above their catalytic converters. 👍🏽 But it can be done only in those countries where Car Check or Car Passing in every year or within 2 years is not required 🙏

[@TheTrooperGirl]

Great information and a wonderful refresher.

[@laragreene8328]

GREAT VIDEO!! Now I just need to look up the signs of one being clogged!!! I know only little about them. I just know theres extreme heat under car hood and not sure if this is the problem or not.

[@yuvonnearnold4673]

On my 1999 Chrysler LHS I know this one night when I parked I seen smoke so I looked out of my head and sing a cherry red light that was my catalytic converter overheated so yes they do overheat you will feel excessive heat under your hood that's a symptom

[@CHIBA280CRV]

Wow that is me clogged cat 🐱 , thanks for the informative video.

[@mikeclough3363]

Thank you for making this video.

[@libyanloyal7932]

You the man regards from libya

[@hells-wolf3120]

Thanks man that helped me out alot its great that I watched this thank u

[@aybcd]

Hi Keith, Happened the same with my duratec mx5 NC. I gutted the 1st cat to see if I can save the 2nd cat. I have 2 springs that are connecting the exhaust pipe with the 2nd cat, whenever there is a bigger volume of air that cannot flow through the 2nd cat the springs let them out, making a rattling noise at high revs. With the unclogging (cleaning out the mouth of the 2nd cat) it became much better, but I think it still has particles in it. Can I clean it somehow? With water + some detergent? In your case you needed to replace the 2nd cat? TBH i did not go anywhere with it yet, can the 2nd cat clean itself out? I need your opinion before investing my time to get it lifted and cleaned somehow. Thanks M

[@BarboursAutoHelp]

It’s my opinion that replacement is best. I’d also replace the other. Did you get the root cause of failure corrected? I’d definitely do that before replacing cats.

[@aybcd]

@@BarboursAutoHelp 1. owner installed a sport 4-1 header (catless), 2. owner wanted to put back a cat into the header to solve check engine issue (instead of just relocating the o2 sensors before and after 2nd cat). He bought an aftermarket header with cat, that only lasted 30 thousand kms and fell apart, Mx5 NC mk1 has a little bit of factory oil consumption that probably helped. My problem is that a genuine mazda midpipe (incl. 2nd cat) costs around 1800 usd. I might just replace the 2nd cat with a universal cat and relocate the o2 sensors, so I will have only one catalytic converter instead of 2 and no check engine light. The first cat (in the header, which is currently gutted), will be replaced to a sport header. Since holiday season is coming, I will might have a little bit off free time, I will try to soak the cat into some kind of detergent and rinse it with water, would be good if I could save this original 2nd cat, since it worked perfectly before this all happened.

[@Dandadada12]

I got my catalytic converters replaced by this shop. It cleared my codes but I got a o2 sensor code for bank2 sensor 1 and I replaced the o2 sensor still have the code. Replaced fuel injectors no change and I looked under the car today and noticed the mechanic didn’t put the catalytic converter pipe flush with the manifold and even left out a screw. There is a gap between the two. Can this be my problem with the o2 sensor code?

[@bob123281]

Yes basically where he left the screw out is an exhaust leak. It introduces air from the atmosphere and messes with the 02 sensor reading

[@b-bitter91]

How much the shop charge u?

[@mcphotolock1]

Thanks for the video share, that was exactly what I was look for.

[@samietelamaki2498]

I have been struggling with my golf v 1.6 and discovered this video. I removed the catalytic converter and tried to shake a little bit, there was no sound and nothing came out. I tried to put some air trough it with compressor and it hardly came out at the other end. Now I will try to clean it with soap soaking 12 h. I read it some forum. Do you think this is pointless? Should I just replace my cat even though it hurts my wallet?

[@kevinkraftable]

So did you have to get an entire new exhaust system? How do you get that crap out of there?

[@arthurfricchione8119]

Wow number 1 to like" that's a first. Great info in your video. Keep the m coming. 👍

[@EDGeProjects]

good tip on the o2 semsor removal to test.

[@KevinWolfay]

How about if you take both upstream O2 sensors off and cranks but does not start ? What’s your take

[@Fortuna_716]

Pretty sure this is whats going on w my 06 explorer..started losing power, currently cant get over 45 mph. I replaced plugs.wires.egr.air filter and tps connector since it was frayed thinking I solved the problem. Helped slightly but not much. So I can pull the o2 sensor to alleviate some exhaust until I have enough money for new cats?

[@coltboy1987]

Nice video thank you it was my answer

[@isaiahw1995ify]

If it’s clogged will a code show up??

[@mydjsoundz]

Great video thanks

[@BarboursAutoHelp]

You bet

[@davantemckay9448]

Currently going thru this in a 2002 Buick park ave

[@1111comment]

never seen this many warnings on a youtube video 😂

[@BarboursAutoHelp]

Hello viewers! Just for the record. I would not suggest cutting out converters to resolve this concern. A repair of the root cause would be needed and then converter replacement. Many states in the US have emissions standards and have emissions testing to be sure that your vehicle is not in violation of these standards. The federal government has emissions standards for your vehicle. Albeit, the federal government will not be testing your vehicle. Never the less, I don't think it a good idea to violate these standards by removing converters. That is my opinion.

[@liveandletlive2894]

I have a 03 civic and I suspect a clogged cat...have a 02 sensor before the cat and 1 in the cat which should I remove to test for a clogged cat Wouldn't the car run differently anyway because it's missing data from the sensorn

[@jjwalker2011]

😂

[@liveandletlive2894]

Fixed turned out to be a bad upstream sensor

[@lilrichhomietyjay6620]

@@liveandletlive2894 i have a 03 civic too when I press the gas it acts like it doesn’t want to kick up should I cut it also?

[@liveandletlive2894]

@@lilrichhomietyjay6620 what exactly is the issue? Won't Rev up? Check engine light on?

[@Doviruses.existbaileyonodysee]

what do you think would cause an even layer of smoke to emit from the surface where the catalytic bolts to the exhaust manifold (when the engine gets to temp) ? Last time i checked the fluids and oils appear to be where they should be (the oil cap has very minor signs of milky residue). we removed the pre/post sensor to the cat which i thought may have worked then replaced the cat. but then not long after a bit of a run it seemed to come back little tk barina.

[@adamsorell4851]

Hows taking out the rear o2 sensor going to make a,difference? The front sensor is one that has to be removed from suspected blocked converter..doh!

[@BarboursAutoHelp]

You did pick up the info about the cat set up on the vehicle in the video right? Has three cats. Not a normal 2 cat set up.

[@adamcorria1647]

Thank you helped me a lot great video

[@BarboursAutoHelp]

No problem

[@AsadAli-ek2xz]

4ŕ

[@edgeofvamp]

Would've been awesome to get a video of you starting it and letting it blow that out.

[@aarongocarten8376]

Helped a lot thanks

[@fariaspiero9496]

I have a question, it’s actually kinda random if you were to break off the stud @ 3:30 how would you remove it. Asking cause my broke. Ty for your time in advance

[@2000jackben]

Someone said coolant getting into the cat. could cause the initial problem. My thermostat was about 15-20° cooler than it should. I not quite sure if coolent could get into the exuaust system from that or not. I wouldn't think so but maybe someone else out there would know?

[@jlovesj3335]

This is exactly what my car sound like

[@user-ql3ge2us4s]

I know this is an old video but I was told I had a clogged cat. I unbolted the exhaust after the alleged clogged cat and the car was back to normal. Does this mean the restriction is after the first cat? Or would it still help?

[@NaterVader85]

The vid is very helpful, but on my Camaro, I don't have a check engine light on. I suspect it to be either my spark plugs/coils or my exhaust. My car wants to bog or shake when running idle and really bog down when I speed up, but stops if I slam the pedal or let off. I don't know which is the issue.

[@BarboursAutoHelp]

Never hurts to take it to a shop if you aren't sure.

[@josemelis4153]

I have the same sound with my 2017 ford fusion I’m hoping you can help me?

[@khalidjj2073]

Great info.. thanks alot. Question, if the cat is falling apart and pieces falling out, does this mean cat is not doing its job and will fail smog test in CA. Thanks my 2001 has similar issue will definitely check it. Thanks again

[@terrymarsh8094]

Thanks for sharing really appreciate it

[@BarboursAutoHelp]

You bet

[@telo990]

Thank You So Much . I’m finna order new cats . My 2010 mustang sound so bad I been chasing my tail . I was finna change out my injectors before watching your video. Big life saver . Thank You 🙏🙏

[@jeremymac2344]

Great video man did you take the O2 sensor off up by the motor or the one on the converter

[@mekkohopiye4777]

Got a charger with 2 cats and will 1 clogged cause a overheating issue ? Only heats up during high speeds

[@davissunglasses]

Could you have back pressure problems if the idiots at the mechanic shop beat the crap out of the flow master muffler to get it apart trying to get to the gas tank to replace fuel pump.

[@medzzz85]

If it's extremely clogged, can this cause your car to overheat?

[@littleboudreaux5026]

Yes if the motor can't release the fumes the gases and the heat all backflowd back into the block/motor causing it to run hot

[@rokovq]

Can also destroy your engine aswell

[@snakeeyes3733]

So basically you're going to want to replace that front end catalytic converter?

[@Yarner2424]

Huge help. Had one cat replaced, but because it was cracked, sure enough, a piece traveled and wrecked another cat. It's been awesome replacing two of them. Not.

[@BarboursAutoHelp]

We hurt together, my friend. Hugs

[@prestonboling1427]

which o2 sensor should be pulled? before where you think your clog is? what if there are multiple? should i pull the one closest to the clog or closest to the motor

[@CoachHumberto]

Did you replace both bank1 and 2 cats or just the last one in the rear? Which one was melting? Did you buy oem cat$$$$?

[@BarboursAutoHelp]

The owner did not choose to fix it. It was material from the up stream cat.

[@brandonharvey7939]

If you're losing vacuum that should also suggest that you've got some exhaust valve leakage because vacuum is created by the downward stroke of the piston while the exhaust valve is closed and the intake valve is opened so a plugged exhaust could become pressurized but if the valves are sealing properly it shouldn't have much effect on the intake except for the loss of power caused by the restriction. Otherwise the only explanation is that the tiny pocket of air left over at TDC between the exhaust and intake stroke contained enough PSI above atmospheric pressure to cancel out the vacuum otherwise created by the intake stroke, in which case I would think your rusty think all steel exhaust pipe would blow out a vent hole long before it starts blowing exhaust out the intake..... probably got a leak in the EGR as well thats not responding to the loss of vacuum. If the cats plugged i would bet she is too. Id get rid of at least one and throw a turbo on her myself..... after she got a proper valve job of course

[@danielbrien1776]

Thanks much for video

[@BarboursAutoHelp]

Absolutely!

[@dantonsteele8128]

so now youre goin to replace thecat converter?

[@gto861]

What was the cause for a clogged and broken down catalytic converter, rich fuel mixture condition due to a faulty fuel injector or some other reason? If you don't mind please reply me coz I'm having a weird power loss, fuel economy and a misfire at 1500rpm with my car.

[@BarboursAutoHelp]

The vehicle in the video was driven for... maybe years with an ignition misfire. That was allowing a bunch of unburned fuel into the cat converters.

[@wildboar7473]

Hello, Mechanic fixed the bottom catalyzer clog but still my V6 escape piston 2 &4 dont work, he says maybe local ones are clogged also? Or Computer fault?

[@RenLeeTobassey]

I just picked my truck up from my mechanic, because it was stalling out after driving for about 30 minutes. He replaced my o2 sensor. Said it was the cause. My question is did that fix the problem like he said, or is it possible it was really the cat??

[@BarboursAutoHelp]

Well....how's it running?

[@RenLeeTobassey]

@@BarboursAutoHelp well it's not stalled out....🤞🤞

[@BarboursAutoHelp]

That may be a good sign. I hope it holds.

[@RenLeeTobassey]

Me too!!

[@stevezielinsk4964]

Mine runs good till motor gets to running temperature. Any suggestions

[@adamsala9291]

Superb video 👍

[@abdulhassan1107]

Would this damage the engine, if it runs for like 10 minutes? I know I have a clogged converter. I tried spraying Liqui Moly but it didn't help. I wanna remove the cats and replace them with resonators, but I'm a bit worried about my freshly rebuilt 347 Ford.

[@BarboursAutoHelp]

What exactly are you asking? Please excuse me. Just want to make sure I understand what you’re after before I answer.

[@micmike]

Can't you hear it from the end of the exhaust pipe, it will sound sort of muffled?

[@VictorPoulin]

Well seeings how the exhaust has to flow through a "muffler" I guess it would sound muffled lol.

[@ibggetsemani1206]

@@VictorPoulin nice

[@sgtbigtoe7640]

Had a 86 mazda protege and the front cat the honey comb was melted and plugging it up

[@albertoliver2450]

Nice bro thanks

[@gregmiller5907]

if its clogged will it keep it from running/idling at all I have to feather the throttle to keep it running.

[@BarboursAutoHelp]

Possibly. The symptoms are better or worse depending on the severity of the blockage.

[@tylerram39]

My friend has a 01 oddysey and after it’s warm he has to give it throttle to start, we drilled holes infront of cat and it still does it. Time for saw zaw?

[@UNKLELUKE86]

Eddie murphy put a banana in the muffler

[@astrogunz2108]

Ahk-welll!!!

[@justme5689]

I'm not going to fall for the banana in the tailpipe.

[@richroc7]

I don’t have a bore scope but I’m confident my cat is clogged for 3 months now and I’m risking blowing the engine because I have no money to replace it & I’m in NY which means I have to use a cat that costs 3 times as much as a regular cat at $1,000.00. I want to vacuum it out or clear out the clog but I’m not sure I’ll get the bolts off.

[@HugDeeznueces]

is this common to happen? holly crap! are cats supposed to be replaced after so many miles?

[@BarboursAutoHelp]

Not that common. There is no service interval as far as I know.

[@JamesSmith-lt5zz]

If it falls within 7 years or 70k the manufacturer is supposed to replace it free govt mandate something around that time frame

[@thetimeofmylife9425]

Awesome. Thanks

[@BarboursAutoHelp]

You're welcome!

[@drewchainzs8587]

Thanks

[@nicholashhall8069]

I'm having very similar symptoms with my 99 Silverado. Idles ok, you can feel a slight rumble and going down the road it's fine until you hit about 65+mph. I can't hold it at 65 or it buckles. Also when running and in park it likes to rumble. Hopefully clearing out the cats helps.

[@bolerdweller]

My 97 sierra can't rev up past 3 grand. I'm suspecting this.

[@2000jackben]

My trailblazer did the same thing. And as it got hotter it got worse. I had to limp it home at 15mph. I didn't have any codes either.

[@boostedkidproductions9719]

Did you have to replace the catalytic converter connected to the manifold also

[@BarboursAutoHelp]

I didn't replace any of the converters. The owner didn't want to do it.

[@someoftyrekhall6441]

Was smoke still comin or the exaust while it was cloggd?

[@tiaelschlager2516]

My car will start up and run doesn’t make any noise but when you go up a hill it has no power. It’s a 2007 Toyota RAV4 could it be the catalytic converter?

[@socalrep1]

100 percent worth checking. removing the O2 sensor is a nice trick

[@MrJohnnyDistortion]

If you were to remove the catalytic converter would the P0420 code disappear and would the ECM still run correctly with the 2 O2 sensors in place or would you have to install those bungs to pull the 02 sensors away from the exhaust stream for everything to work properly?

[@BarboursAutoHelp]

I know for sure the 420 would still be there. However, I’ve never modified an exhaust system in the way you describe. So I don’t know.

[@MrJohnnyDistortion]

@@BarboursAutoHelp I decided to floor the throttle from 15 mph and she went like a bat outa hell with a big cloud out the tailpipe. She had no problem revving and pulled strong so I don't think it's a clogged catalytic converter. I did that 4 times each with less of an exhaust cloud pulling real strong. I'm guessing that it must be a bad O2 sensor. Whataya think?

[@BarboursAutoHelp]

A 420 doesn’t mean your cat is clogged. It means that the PCM thinks that the cat isn’t doing its job. You’ll need to have a pinpoint test performed to properly diagnose this... I’m assuming your trying to get ride of the code.

[@MrJohnnyDistortion]

@@BarboursAutoHelp Yes, getting rid of the code correctly so that it runs and performs as best as it can be made to.

[@BarboursAutoHelp]

Yea, if you don't have a scan tool that is capable of data stream then it will be very difficult for you to diagnose this on your own. You'll need to take it to a shop. :(

[@freddiemack26]

Some one here in my city is selling a 2004 infiniti g35. He says it won't go over 45mph due to a clogged cat. Could that be the issue. Or is the transmission going out?

[@BarboursAutoHelp]

Don't know

[@jessicataylor6837]

Can you still drive with a clogged catalytic converter?

[@BarboursAutoHelp]

Not a good idea. Id say no.

[@janxski6900]

could a clogged cat cause one bank to run lean and the other to run rich? as well as power loss

[@BarboursAutoHelp]

Hard to say. I'd have a tech look at it.

[@glenmckelvey5952]

My 2000 frontier sound's a lot like that . It doesn't do it until it comes up to temp . It idles fine but when you give gas it sounds a lot like that . When it cools down it will run okay again until it comes back up to temp . Do you think it could be the same problem . Thanks .

[@BarboursAutoHelp]

Its possible. Can't say 100% though.

[@happysmile9225]

Great video