Comments
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hollow the cats out and save 800 bucks do it the smart way
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I had the same exact problems as your customer and they told me it was the transmission. Now I'm looking into a catalytic converter failure. I don't have anyone honest to help me. Thanks for the video.
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Thank u so much for the vid. had the same prob i thought was trans at first, but would only happen after car heated up. Nd i heard the rattle from cat nd never thought anything about it cuz i had no codes. Bravo
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If someone replaced the timing belt incorrectly, or it's mistimed, could that cause the misfire, which in turn cause the catalytic converter to go bad?
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Thank you for the information. This sounds suspiciously similar to my repeat issues with the 06 Focus. I'll be sure to ask about it. :)
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I just repaired another vehicle yesterday in which another shop assumed the cat was bad due to the P0420 and two other codes, P0171 and P0174 (Lean on both banks). They wanted $800 to fix the cat ONLY by looking at the codes and not actually doing the vacuum test. It passed the vacuum test with flying colors and only turned out to be a dirty MAF (mass air flow sensor). The resistors were extremely dirty which gave the PCM improper air flow calculations resulting in a lean condition.
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A FYI for those diagnosing a P0420: Catalyst System Efficiency Below Threshold (Bank 1). One a V engine this is the side of the engine exhaust with cylinder #1 (if you have dual exhaust with 2 or more cats).
I had a P0420 on an inline 4 cylinder engine along with false readings from the rear o2 sensor. The previous owner had brought the vehicle to multiple shops that could not figure it out. I took the entire exhaust off and found a barely visible hairline crack in the exhaust manifold. I also found faulty wiring to the rear o2 sensor. Bam! Problem solved.
If you plan to hollow out the plugged cat you'll need to extend the rear o2 sensor outward to fool the PCM into believing the cat is still present. I purchased a $2 o2 bung and a short black steel pipe for about $2. These are 2 different thread types so I welded the bung to the black steel pipe, cross threaded it into the OEM exhaust bung, and welded it in. Never had any related "check engine" lights and the rear o2 readings are on par as if the cat was in place. This may not apply to certain vehicles that use the o2 for other functions such as some Subaru vehicles. -
why would he have more expensive and trouble. no matter what the cat is bad once you have a 0420 code. you still had to install new one.
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im having issues with a p0420 on an r50 pathfinder. i have 2 cats per side! so Im trying to figure out what one needs to be replaced on my passenger side. front one costs 300 and the back i can buy a universal for 70 bucks......
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I just got the CAT fixed and the rattling noise started again after like 1-2 months. Very annoying.
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Bravo! Bravo! That was a hell of a show man. Good Job! Thank you for sharing
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yes sir troubleshooting is very important
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stopped watching after he says a p0420 is for a 02 sensor it's for the convertor is below efficiency which means it can no longer converter into cleaner emissions smh
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Well what if the only code that's being currently throw is p0420. It was previously throwing an O2 sensor code that I had fixed. Now the car is misfiring. Replaced spark plugs and wires. Now what?
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Best diag vid.
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what I do when I suspect a catalytic converter First if you can't get any RPMs out of the engine just pop the bolts loose from the exhaust pipe to the exhaust manifold and start the car you will know if the converter is plugged.
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Great video! There are too many people who run cars on false economy!
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For today's cars, both professional and DIY mechanics need to know about what they are working on. The three-way-catalytic converter (TWC) is part of a whole engine fuel/exhaust system design. With a proper functioning engine system, today's TWC are designed to operate for the life of the car and meet emissions requirements. In the case of inefficient TWC, the best way to test is with an exhaust gas analyzer (which are expensive) and proper testing methods of which there are several. If a TWC is determined to be defective, the cause of the failure must first be determined. Not to do effective diagnosis and repair of the root cause of TWC failure can result in replacement failure soon after. For example, California emissions testing is super tough and replacement TWC must meet those requirements. Even replacing a TWC in California must meet strict requirements. In some areas of the U.S. to even replace a TWC requires a special certification. Go to any auto parts web site (try rockauto.com) and notice most of their TWC offerings cannot be sold in California. OEMs are often what is needed. For a comprehensive discussion on engine emissions design and catalytic converter info and testing go to this link. This information is also quite helpful in avoiding a TWC failure in the first place. http://www.lbcc.edu/attc/documents/BAR-2011-CAT-testing-methods.pdf
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when the catalytic block up it makes the spark plugs get black also the hose pipes and damage the 02 sensor
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http://toolsandtime.com/ Here is a short clip on how I trouble shot a DTC P0420 and why it's good to talk to the costumer about the symptoms