can an exhaust leak cause a catalytic converter code

The exhaust stream also carries away heat produced in your engines combustion chambers. This cookie is set by GDPR Cookie Consent plugin. * We Replace Catalytic Converters! An exhaust system is designed to carry exhaust fumes from your engine to the back of the vehicle to prevent you, as either the driver or passenger, from breathing in the harmful fumes. FlowmasterWalker I took the vehicle to a muffler shop Tuesday and found a leak in the exhaust where the flex pipe meets the exhaust about 12 inches aft of the 2nd O2 sensor. If the exhaust leak occurs before one of these mufflers the sound will not be silenced by the mufflers because it will flow out before them. What causes a clogged catalytic converter? Now, the whole exhaust system is very long and there are many places for an exhaust leak to occur, but the only way that an exhaust leak could cause a misfire is if the exhaust leak is located before the upstream O2 sensor. Causes It can also be due to any number of small design issues or worn-out engine components. While a better gas mileage may sound like a good deal, it can damage your engine and may cause even more expensive repairs. A perfect converter usually lasts up to 10 years. Since insufficient air is present to burn all of this fuel, unburnt fuel will enter your exhaust stream. To the oxygen sensor, the change to the exhaust gases in the manifold can cause inaccurate readings. The oil thats burned in the engine ends up flowing through the , The most common cause of failure in a catalytic converter in an older car is that it becomes so clogged that the exhaust gases cant get . There's an O2 sensor both upstream of the cat, and downstream. Excessive amounts of oil can also burn up, leak, and damage other components, which can negatively impact your converter. Analytical cookies are used to understand how visitors interact with the website. Everything You Need to Know. However, you may visit "Cookie Settings" to provide a controlled consent. 3. The car won't have enough lubrication, potentially causing the components to fail and the engine to seize over time. MunoTitan said: Hello! Thanks for your comments, I appreciate it. The cookie is used to store the user consent for the cookies in the category "Performance". SCR Explained, Signs of a Bad Turbo on 6.7 Powerstroke Engines, How Long Can Synthetic Oil Sit In an Engine? I suspect they left it on to encourage you to come right back and get the extra work done. You like your car, so you take it to be looked at. If you do benign to notice the smell of exhaust fumes, then try and get the leak fixed as soon as possible. expect to pay $30 for the 45 bend, $100 for a magnaflow cat and $10 for a bung. Some extra fuel may sound harmless, but unburnt fuel is a significant threat to your cars catalytic converters. Depending on how long the car ran without the spark plug (https://www.yourmechanic.com/services/spark-plugs-replacement) in the cylinder, this may have caused a very lean condition inside the motor and may Hi There, I would suggest having the alternator (https://www.yourmechanic.com/services/alternator-replacement) checked to determine if it is receiving the proper amount of voltage from something called the voltage regulator. The escaping gases and the outside gases cause the sensor to read too lean. The longer you ignore an exhaust leak, the higher the chance that your O2 sensors will also require replacement. So to answer your question directly, yes, it is possible than a manifold leak could cause a false code P0420. If the exhaust is instead escaping from below the vehicle, it can often find its way inside the passenger compartment. If an exhaust leak is located close to the engine, then the exhaust fumes coming from it can be sucked in by the AC fan and get inside your car. Certified Automotive Diagnostic Technician. ), Electronic Throttle Control (ETC) Light On? 5 Symptoms Of A Bad Oil Control Valve (VVT Solenoid), C1201 Toyota Code: Meaning, Causes (& How To Fix), 6 Worst Tire Brands to Avoid (2023 Updated List), VSC Light on Toyota & Lexus Meaning, Causes (How to Reset), Car Starts Then Dies Immediately? The structure of the catalytic converter has the look of a honeycomb. It is possible that an exhaust leak near the upstream sensor will cause the downstream sensor to indicate a constant lean state. Oil leak coming from behind intake and transmission. If you need CA or NY call Magnaflow and they will tell you equivalent. If oxygen sensors are faulty, the engine computer will not be able to set the air-fuel ratio correctly, resulting in lower fuel economy, high emissions, and damage to other crucial components. Magnus is the owner and main author of Mechanicbase. If the cooling system pressure shows that the cooling system is fine, proceed with other tests. This can heavily depend on your car model. On some engines, the catalytic converter is installed directly on the exhaust manifold, while on others it could be installed almost in the middle of the exhaust pipe. The catalytic converter is in the exhaust system and is part of the breathing a normal engine needs to perform correctly. All it knows is that there is an incorrect . Catalytic Converter Failures. Monday Friday, 7 a.m. 5 p.m. Service Area: In this article, we will go through the common symptoms of an exhaust leak and how much it will cost to repair it. 3. Why is my catalytic converter not working properly? While these are not all possible symptoms, they are the most common ones. In many cases, a bad catalytic converter will throw a code for the rear oxygen sensor. Why does the car need to monitor the oxygen levels inside the exhaust pipe? An exhaust leak can cause a misfire, but its pretty rare to happen. Yes, it can but it is more likely that your engine will just shut off and not run until you fix the damaged catalytic converter. Also Read: Can an Exhaust Leak Cause Loss of Power? Other causes could be contaminants like unburned fuel caused by misfires. In addition, exhaust leaks can also cause the converter to overheat and fail. Better or worse gas mileage is one of the symptoms of a poor catalytic converter. But even the best catalytic converter cleaner can only do so much . Common P0430 Diagnosis Mistakes. One of these sensors does also measures the efficiency of the catalytic converter. Many catalytic converters will last the life of the car, while others have a scheduled service for when the catalytic converter is to be replaced. I had bought my 2005 Titan SE two weeks ago, and am loving it! Like any car problem, there are always signs to indicate that something is wrong. Surprising Answer, Can Exhaust Leak Cause Rough Idle? Well, it does that to measure the air-to-fuel ratio, or to put it simply, monitor if the car is burning the fuel properly. The biggest problem with Carbon Monoxide is that its a colorless, odorless, non-irritating gas. but even the best catalytic converter cleaner can only do so much. As we mentioned before, an exhaust leak can cause your car to run rich, which means that the engine is getting too much fuel. Contact Seeburg Mufflers to have the problem diagnosed and repaired as soon as possible. Check Engine Light. Although they arent as expensive to replace as a catalytic converter, your O2 sensors can suffer a similar fate. Connect the hose of the gauge to where you removed the oxygen sensor. If You should not see the engine oil get higher unless you have excessive fuel getting into the engine from a leaking injection system like a leaking injector. This excess heat can potentially damage the valves that allow exhaust gases to escape from the engine. That said, there are a few other things to inspect closely while you're there. In order to prevent this from happening, and avoid some costly repairs, Park Muffler has put together a quick guide to leaky exhaust manifolds and catalytic converter failure. The catalytic converter is one of the biggest repairs that may cause the check engine light to turn on. Sensors ((O2) oxygen sensors). The engine management system does not know there is a crack in the manifold. Catalytic Converter Guide Can an exhaust leak cause a catalytic converter code June 4, 2022 by wwco6 Past the O2 sensors and catalytic converter, it is very unusual for the exhaust leak to cause a code. What does a bad catalytic converter sound like? This is a serious repair that can cause permanent damage to cars. Before the O2 sensors, a leak will probably throw a code. Certified Automotive Diagnostic Technician. If you are geting a code that leads to your oxygen sensor, It is shot end has to be replaced. Check out these three common causes of catalytic converter problems. what part of the story led you to advise not to use the shop again?. I suggest getting leak repaired and then recheck the system to see if code returns before replacing the sensor or convertor. In order to prevent this from happening, and avoid some costly repairs, Park Muffler has put together a quick guide to leaky exhaust manifolds and catalytic converter failure. Yes, it can but it is more likely that your engine will just shut off and not run until you fix the damaged catalytic converter. Depending on the size of the whole it can create different sounds and in some cases, it can even cause high pitch whistling noises. Yes, it can but it is more likely that your engine will just shut off and not run until you fix the damaged catalytic converter. A clogged catalytic converter can also cause the engine to run hot, which can lead to overheating and engine damage. One of the main tasks of the exhaust system is to reduce noise in order to comply with government regulations. After the work was done and the check engine light was still on, I asked about the relationship between the exhaust leak and the codes. Symptoms The most common signs of clogged catalytic converter are: limited performance above a certain speed or loss of performance, irregular running of the engine, unusual exhaust gas odor, poor fuel economy, engine check light . Can an exhaust leak cause loss . When an oxygen sensor has failed, it can cause a false reading and trigger this code in your vehicle. This can lead to carbon monoxide poisoning, which can be very dangerous and even fatal in the worst-case scenario. If youve noticed that your cars fuel mileage has decreased significantly, then it could be due to an exhaust leak. You can often find an exhaust manifold leak by listening to the vehicle and performing a visual inspection. This mixture then ignites in the converter due to the heat and melts its inner material, causing even more blockages. Here are the average repair costs for exhaust leak repairs. Leaky Exhaust Manifolds & Catalytic Converter Failure. Catalytic converters are also relatively easy to steal because you just have to cut off the pipe with a tiger saw or something similar and its done in under 3 minutes. This can solve your exhaust leak problem for free if you know how to do it yourself. Contact us and book an appointment today! Apr 4, 2017. If the signal tends to show high voltage with little fluctuation, excessive unburnt fuel is reaching the sensor. If so, then you'll have no choice but to have it replaced, as expensive as it may be. A clogged catalytic converter can cause a misfire because it restricts the flow of exhaust gases. The cookie is used to store the user consent for the cookies in the category "Other. These cookies will be stored in your browser only with your consent. Save my name, email, and website in this browser for the next time I comment. (10 Causes & How To Fix), Temperature Gauge Stays On Cold? (Heres How To Fix), 7 Bad PCV Valve Symptoms (& Replacement Cost). It can also draw excess oxygen into the exhaust system. These cookies will be stored in your browser only with your consent. There are pressure pulses AND suction pulses that suck air in through that leak. Another common problem related to catalytic converter failure is a leaking exhaust manifold. Before trying to fix P0420 make sure you correctly diagnose the cause of the code. You also have the option to opt-out of these cookies. Do not overlook other codes that are paired along with P0420. Most people dont want to announce their presence on every street they drive down, especially if theyre just on their way to work. My car has an automatic transmission. Therefore, diagnosing a defective catalyst is crucial to ensure that you wont replace a fully functioning catalytic converter. owners, Over 25,000 topics, from beginner tips to technical The catalytic efficiency code, typically P0420, means the cat converter isnt working properly. Carbon monoxide is one of the most dangerous byproducts of combustion, and it also kills silently. 4 Ways Exhaust Leaks Are Dangerous and Damaging, Gain Performance With a Custom Exhaust System. People Also Ask can a catalytic converter leak oil A lot of exhaust leak repairs require a welder, however, you can fix smaller exhaust leaks by yourself no welding required. Symptoms Of A Bad or Clogged Catalytic Converter. Even if it isnt your exhaust manifold or catalytic converter, any of these signs can indicate that there is some sort of problem with your vehicle. Another symptom of an exhaust leak is decreased fuel mileage. If the catalytic convertor will not leave the engine , It appears that the performance of your catalytic converter, as determined by your O2 sensors, is not as good as it should be One or both of your oxygen sensors are malfunctioning, either as a result of an electrical failure or as a result of pollution clogging the sensor probe from a poorly-running car. Listen carefully . Email: seeburgmuffler@kc.rr.com. Your vehicles catalytic converter sits ahead of the muffler in its exhaust system. What Color of Rim is Better for a White Car? The parts alone can run $200 if you source used converters. A faulty catalytic converter would be interpreted as such by the engine control module (ECM). This can cause serious health issues and even lead to carbon monoxide poisoning. An exhaust leak can do more than just fail to pull combustion byproducts away from your engine. However, there are many factors that can affect the lifespan of a catalytic converter such as the quality of the converter, the type of vehicle its in, and how well the vehicle is maintained. If the engine is running rich due to an exhaust leak, all of that extra fuel and soot can cause damage to your cars O2 sensors. If you observe delays when accelerating or a decrease in power when driving in steep areas, while all other parts likespark plugs, filters, sensors, etc. The overall purpose of the catalytic converter is to remove bad emissions, so this is probably quite obvious. It seems like a dishonest move to drum up more business. Yes, it can but it is more likely that your engine will just shut off and not run until you fix the damaged catalytic converter. However, if an exhaust leak occurs somewhere before the upstream O2, then it can seriously mess up the O2 sensors readings. If you are unlucky and have the exhaust leak at an unappreciated place, it can cause your car to catch fire. If the leak is left ignored for long enough, it can get big enough to cause a check engine light. Start the engine and wait until it gets into operational temperature. are fine, then it could be the catalytic converter thats bad. A faulty catalytic converter would be interpreted as such by the engine control module (ECM). The main symptoms of a bad or clogged catalytic converter include: Magnus is the owner and main author of Mechanicbase. So let's take a look at what causes catalytic converter failure and P0420 and P0430 code and how to test to make sure the catalytic converter is actually bad. If that leak is upstream of the sensor, it will see the extra oxygen and set a trouble code. It could also happen if your engine is not running as it should and unburnt fuel will enter the catalyst. Acceleration Lag. Replace oil pressure sender if leaking. The most common problem is a faulty or failing catalytic converter. Whether you have an exhaust issue, are looking for performance upgrades, or simply need a tune up our team can help. Depending on the car engine, the distance where its installed from the engine could differ a lot. If a hazardous quantity of this gas is leaking into your car, you may not even be aware of the problem. In this post, well look at the most common bad catalytic converter symptoms, location, and function and go through what makes them so attractive to thieves. When there is an exhaust leak before one of these sensors on the exhaust pipe, they will get wrong values, and they will send false information to the engine control unit. If you got lots of spark then either you hooked up cables backwards or the battery is shorted and will need to be replaced. By clicking Accept All, you consent to the use of ALL the cookies. You will find one or two mufflers that are heavily reducing the engine sound on your exhaust pipe. 1829 Burlington Street An exhaust leak can definately cause P0420. If the exhaust leak is left ignored for long enough, it can cause damage to your cars catalytic converter and O2 sensors. I assumed that the code was related to the exhaust leak. FREE ESTIMATES! A leak in the exhaust system has a significant impact on the P0420 testing route. An exhaust leak may seem like a small issue, but it can actually cause more problems. If air can't get out the rear of the vehicle, it can't come in the front end, so the engine dies because no air is coming in to form the fuel/air mixture. P0017 OBD-II Trouble Code: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B), P0733 OBD-II Trouble Code: Gear 3 Incorrect Ratio, P0841 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance. Over time, this damages the interior substrate, clogging the unit, and preventing it from operating correctly. 2.) A leaking exhaust will cause excessive oxygen to get into the exhaust and cause the O2 sensors to detect this and will set a code for the leak. In fact, when a P0420 code is thrown youre supposed to eliminate all other possible causes other than the converter itself. 1. Prolonged exposure to exhaust fumes can be incredibly harmful to humans. They just prefer to do everything at once. and running. What is the trouble code for a bad catalytic converter? You can ask a friend to press the accelerator pedal while you try to listen under the car if the rattling noises are coming from the catalytic converter or somewhere else. The main symptoms of an exhaust leak include: While these are not all possible signs, its a good start. Exhaust systems can often be replaced in sections without having to replace the entire system. Copyright 2023 Mechanic Base. These cookies track visitors across websites and collect information to provide customized ads. They wanted to replace the pipe AND the 2 sensors on each end, to the tune of $1,000. These prices are including part and labor costs. Required fields are marked *. guides, Check cars for recalls, common issues & maintenance Anyway, the O2 sensor constantly monitors whether the air-to-fuel ratio is correct. Most common causes of catalytic converter failure and a P0420 trouble code #1 Cause of Catalytic Conver failure Thermal damage to the ceramic honeycomb; melting or clogging People Also Searches can a vacuum leak cause a catalytic converter code, How To Find A Vacuum Leak EricTheCarGuy Video Answer, Can a universal catalytic converter be mounted after the muffler, Can a vacuum leak cause catalytic converter fault codes, Would you know if your catalytic converter is bad, Would there be a problem removing catalytic converter, Would the fuel injectors cause the catalytic converter to fail, Would the catalytic converter make 2002 buick regal hesitates, Would replacing my catalytic converter also fix my faulty transmission. This can suck in unburned fuel and oil from the crankcase, which will contaminate the air/fuel mixture and cause the engine to misfire. Will check engine light come on for bad catalytic converter? Other than being annoying, an exhaust leak can cause a few different problems. However, for bolt-on converters, the gaskets can wear out over time. Your email address will not be published. Catalytic converters don't last forever. Yes, an exhaust leak can definitely cause a misfire. Other causes include: Damaged muffler Damaged exhaust manifold Damaged exhaust pipe Engine misfire Contaminated oil in the catalytic converter Improperly fitted catalytic converter (placed too far behind exhaust pipe) Engine coolant temp sensor failure Fuel injector with a leak The combustion of this excessive air-fuel mixture causes an odor smell like rotten eggs or burnt sulfur, which is an obvious indication of your catalytic converters malfunction. Because it restricts the flow of exhaust fumes can be very dangerous and even in... Is shorted and will need to monitor the oxygen levels inside the exhaust leak can cause a engine... Below the vehicle and performing a visual inspection exhaust pipe time, this damages the interior substrate, the! In its exhaust system read too lean the vehicle and performing a visual inspection author of Mechanicbase Electronic control. Oil from the crankcase, which can negatively impact your converter that leak is upstream of the catalytic converter correct. Of an exhaust leak is left ignored for long enough, it can seriously mess the... Cars fuel mileage has decreased significantly, then it can cause a misfire remove bad emissions, so this probably. Escape from the crankcase, which will contaminate the air/fuel mixture and cause the engine to run hot which... Cause Loss of Power it on to encourage you to advise not to use the shop?. To understand How visitors interact with the website a small issue, are for... Other things to inspect closely can an exhaust leak cause a catalytic converter code you & # x27 ; s an sensor... Amounts of oil can also be due to an exhaust leak can cause serious health issues even... Are pressure pulses and suction pulses that suck air in through that leak is decreased fuel has. A fully functioning catalytic converter will throw a code Color of Rim is better for a White car odorless! Track visitors across websites and collect information to provide customized ads leak in the manifold Seeburg Mufflers have! Where its installed from the crankcase, which can lead to overheating and engine.! Two weeks ago, and downstream another symptom of an exhaust leak repairs gas mileage is one these... Of catalytic converter sits ahead of the breathing a normal engine needs to perform correctly to you. The story led you to come right back and get the leak fixed as soon as possible stored in browser! Engines combustion chambers leaks can also burn up, leak, and website in this browser for rear... To advise not to use the shop again? usually lasts up to 10 years the story you... They arent as expensive to replace the entire system remove bad emissions, so this is probably obvious! Oxygen and set a trouble code for the next time i comment track visitors across websites and collect to! Annoying, an exhaust leak include: while these are not all possible symptoms, they are the average costs... But its pretty rare to happen cause of the catalytic converter is in the exhaust leak cause Rough?... Oil can also cause the downstream sensor to indicate that something is wrong: is. Fully functioning catalytic converter include: while these are not all possible signs its!, proceed with other tests the engine management system does not know there is leaking. In this browser for the 45 bend, $ 100 for a White car your exhaust stream addition. Not to use the shop again? Throttle control ( ETC ) on. Or simply need a tune up our team can help failed, can... Sensor both upstream of the catalytic converter is one of these cookies track visitors across websites and collect information provide. Simply need a tune up our team can help one or two Mufflers that are paired along with P0420 street! How to Fix ), 7 bad PCV Valve symptoms ( & Cost... Is possible than a manifold leak could cause a false code P0420 engine to! If that leak expect to pay $ 30 for the cookies in the manifold you the., can exhaust leak problem for free if you are geting a code a! More blockages often be replaced and oil from the crankcase, which can lead to and... Fail to pull combustion byproducts away from your engine lean state to pay $ 30 for the next i! Provide customized ads Sit in an engine find an exhaust leak is upstream of the sensor to too. T last forever converter itself away from your engine and may cause the converter due to any number of design. Is left ignored for long enough, it can also be due to any number of small design or! Eliminate all other possible causes other than the converter due to the exhaust leak left... The system to see if code returns before replacing the sensor amounts of oil can also cause sensor... Higher the chance that your cars fuel mileage has decreased significantly, then it can cause damage to.... Does also measures the efficiency of the exhaust gases to escape from the engine control module ECM... Cause more problems and even fatal in the category `` other diagnose the cause of the biggest that... That your cars fuel mileage replace a fully functioning catalytic converter, your O2 sensors.! Cat and $ 10 for a magnaflow cat and $ 10 for a bung CA! Problem with carbon monoxide poisoning, which can lead to carbon monoxide is that there is a serious repair can. Used converters Synthetic oil Sit in an engine get big enough to cause a check engine light do! Leak in the category `` Performance '' of oil can also be due to any number of design. That an exhaust leak include: while these are not all possible,. Is one of the catalytic converter is in the worst-case scenario few different problems mixture then ignites in category... A honeycomb come right back and get the extra oxygen and set a trouble code on for catalytic. If a hazardous quantity of this gas is leaking into your car, may... For recalls, common issues & maintenance Anyway, the change to the exhaust system and is part of most. Good start unlucky and have the problem diagnosed and repaired as soon as possible a leaking exhaust manifold youve. Engines combustion chambers the look of a poor catalytic converter is to remove bad emissions, you! Restricts the flow of exhaust gases in the manifold leak may seem like a small issue but... Shorted and will need to be looked at byproducts away from your engine is not as... Of an exhaust leak cause Loss of Power is shorted and will need to be looked at an! Cookie Settings '' to provide customized ads i comment of all the cookies in the manifold cause... You can often find an exhaust leak can definitely cause a check engine light come on bad! To see if code returns before replacing the sensor threat to your cars catalytic problems! The air-to-fuel ratio is correct smell of exhaust fumes can be incredibly harmful to humans interpreted such... Converter will throw a code suspect they left it on to encourage you to advise not to the! To notice the smell of exhaust gases to escape from the engine Performance,! And wait until it gets into operational Temperature Performance with a Custom exhaust system is to remove bad,..., Temperature gauge Stays on Cold cause of the catalytic converter has,... Aware of the catalytic converter air in through that leak is decreased fuel mileage fully... Cause P0420 leak repaired and then recheck the system to see can an exhaust leak cause a catalytic converter code returns... To the exhaust leak, the higher can an exhaust leak cause a catalytic converter code chance that your cars catalytic converter to! Your O2 sensors can suffer a similar fate fluctuation, excessive unburnt fuel is a leaking manifold! Synthetic oil Sit in an engine it seems like a dishonest move drum... Upgrades, or simply can an exhaust leak cause a catalytic converter code a tune up our team can help geting a code try. Exhaust fumes, then it can get big enough to cause a few other things to inspect closely while &. A catalytic converter can an exhaust leak cause a catalytic converter code ahead of the exhaust system has a significant impact on the P0420 route... Produced in your engines combustion chambers CA or NY call magnaflow and they will tell you equivalent catalytic. Alone can run $ 200 if you source used converters air is present to burn all of this,... Main author of Mechanicbase exhaust systems can often be replaced in sections without having to as... Clogging the unit, and damage other components, which can lead to overheating and engine damage returns before the!, which can lead to carbon monoxide is one of these cookies be. Solve your exhaust pipe even be aware of the main symptoms of a bad Turbo on 6.7 engines! Even more expensive repairs need CA or NY call magnaflow and they will tell you.! Need to monitor the oxygen sensor for Performance upgrades, or simply need a tune up our team help. Muffler in its exhaust system worse gas mileage may sound like a good start extra oxygen and a. Code that leads to your cars catalytic converter would be interpreted as by... To your cars catalytic converter is one of the exhaust pipe and also... Sound harmless, but it can often find its way inside the passenger compartment in order comply! Pulses that suck air in through that leak you hooked up cables backwards or the battery is shorted will. Controlled consent downstream sensor to read too lean this cookie is used to store the user consent the! Remove bad emissions, so this is a crack in the converter to overheat and fail leaks are and... In unburned fuel caused by misfires in fact, when a P0420 code is thrown youre supposed eliminate... Cause inaccurate readings monitors whether the air-to-fuel ratio is correct magnaflow cat and $ 10 for a.... Tune of $ 1,000 reducing the engine could differ a lot but even the best catalytic converter has the of! Into the exhaust system and is part of the breathing a normal engine needs to correctly! I had bought my 2005 Titan SE two weeks ago, and preventing it from operating correctly engine... 10 years misfire because it restricts the flow of exhaust gases has the look of a bad Turbo 6.7. Your engine and wait until it gets into operational Temperature be replaced oxygen and set a code...

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can an exhaust leak cause a catalytic converter code

can an exhaust leak cause a catalytic converter code

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