It could be a faulty bad catalytic converter, but I have seen many cases when the catalytic converter is pretty new, but it's not an original OEM part. In some states and countries globally, you have to do a yearly emission test to pass the inspection. Save my name, email, and website in this browser for the next time I comment. CarCareCamp.com uses cookies to improve your experience. If you are geting a code that leads to your oxygen sensor, It is shot end has to be replaced. The catalytic converter is mounted in the exhaust system and basically looks like a . Made with in Silicon Valley. The catalytic converter is a part of your vehicle's exhaust system that significantly reduces pollution and the car's carbon footprint. We also use third-party cookies that help us analyze and understand how you use this website. Maremont A catalytic converter is an important part of a car's exhaust system, and it can cause problems if it isn't working properly. When an exhaust leak occurs close enough to the exhaust manifold, the system can no longer draw enough heat away from the engine. This cookie is set by GDPR Cookie Consent plugin. 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. Sadly the P0430 code popped up the other day. I advise you to reset the computer and not go back to this shop. Unburnt fuel can ignite when it contacts the catalytic converter and melt the converters ceramic honeycomb insides, which will completely destroy it. The honeycomb shape aims to ensure that the pollutant gases flow through the more exposed surface and convertsNitrogen oxide, carbon monoxide, and hydrocarbons intosafer elements likecarbon dioxide. If you suspect that your catalytic converter is not working properly, here are the symptoms to look for. Sometimes you can be lucky, and the exhaust leak can be fixed with a welder. Whether you have an exhaust issue, are looking for performance upgrades, or simply need a tune up our team can help. Another symptom of an exhaust leak is decreased fuel mileage. Post back with the result. A careful search might reveal exhaust leaks that, when repaired, "restore" catalytic converter function, at least from the point of view of the ECM. If you need CA or NY call Magnaflow and they will tell you equivalent. Can an exhaust leak cause a catalytic converter code? Rich-running engines can cause damage to a catalytic converter and eventually lead to a converter failure. It is possible that an exhaust leak near the upstream sensor will cause the downstream sensor to indicate a constant lean state. An exhaust leak can do more than just fail to pull combustion byproducts away from your engine. Usually, an exhaust leak will not cause a check engine light, unless the leak is located before the upstream O2 sensor. The check engine light often appears if your catalytic converter is clogged, although since the O2 sensor reports slower (because it measures efficiency over a longer period of time than other sensors), you might get a check engine light for something else like engine misfires, before you get a check engine light for . If you can smell your exhaust leak inside your car, then harmful exhaust fumes are leaking into your cabin. A lean exhaust code and misfire codes are placed on the bank when there is an exhaust leak. 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 . This post contains links to products that we may receive commission from at no additional cost to you. Below you will find four ways that an exhaust leak can lead to much bigger trouble down in the line. Catalytic converter: $400-$2400 A leak in exhaust: $100-$200 (if welded to repair) DIY Steps to Diagnose Code P0141 If you'd like to try to fix code P0141 at home without throwing money at parts, you'll want to follow the steps below for proper diagnosis. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Exhaust leaks can be costly for other reasons, but cabin leakage is by far the greatest threat to the safety of your vehicles occupants. (https://www.yourmechanic.com/services/oil-fluid-leak-inspection) This engine oil pressure sending unit is the most common leak in this area of the engine. Flat rate pricing based on labor time and parts, Hand-picked, community-rated professionals, Trusted mechanics, rated by thousands of happy car While a better gas mileage may sound like a good deal, it can damage your engine and may cause even more expensive repairs. I suggest getting leak repaired and then recheck the system to see if code returns before replacing the sensor or convertor. The exhaust stream also carries away heat produced in your engines combustion chambers. We do not recommend driving around with an exhaust leak because it is harmful to both you and the environment. People Also Ask can a catalytic converter leak oil Check Engine Light is flashing. There are pressure pulses AND suction pulses that suck air in through that leak. Contact Seeburg Mufflers to have the problem diagnosed and repaired as soon as possible. When the catalytic converter is clogged, it restricts the flow of oxygen in engines, and engines require a lot of oxygen for proper fuel combustion. To understand why an exhaust leak causes a misfire, we need to quickly go over what the O2 sensor is and what it is used for. What this does is it artificially increases the oxygen levels inside the exhaust pipe, which the O2 sensor then reads and interprets as a too lean air-to-fuel ratio, when its actually not. You like your car, so you take it to be looked at. Secondary: Johnson County, Certifications, Awards, Memberships, Associations: One of these sensors does also measures the efficiency of the catalytic converter. If your engine is misfiring, you should get it fixed as soon as possible, because it can lead to further expensive repairs if you just ignore it. If there is severe damage to the catalytic converter, there is no other way than to replace it or remove the catalytic converter and reprogram the ECU. It does not store any personal data. It can also draw excess oxygen into the exhaust system. 2. An exhaust leak can cause a misfire for several reasons. That point is all assuming that all of the info is here. An exhaust leak can definately cause P0420. The same leak, however, might cause air to be drawn into the pipe. A leak in the exhaust system has a significant impact on the P0420 testing route. Exhaust leaks can allow more hot air, unburned fuel, and emissions to enter the catalytic converter which can damage it. If your car engine is combusting motor oil, caused by worn piston rings or clogged crankcase ventilation, it could cause damages to the catalytic converter really fast. 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. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The most common cause of the P0420 code is a faulty catalytic converter. 5 Brake Fluid Leak Symptoms (& Repair Cost), 6 Symptoms of a Boost Leak (& How to Find it Easy), 6 Bent Engine Valve Symptoms (& How to Test Them), Oil Leak Repair Cost - Common Causes & How to Repair It, 5 Causes of a Coolant Leak - How to Fix it & Repair Cost, 5 Symptoms Of A Bad Engine Control Unit (& Replacement Cost), 5 Symptoms Of A Bad Engine Control Module (& Replacement Cost), 4 Symptoms of a Seized Engine & Causes (How to Fix It), How to Hotwire a Car in an Emergency (8 Easy Steps). These prices are including part and labor costs. Save my name, email, and website in this browser for the next time I comment. Synthetic oil is always preferred but you can use synthetic blends, conventional oil or any combination thereof. I just (this morning) had the flex pipe between the 2 cats replaced on my 2004 Toyota Sienna. signs to indicate that something is wrong. Certified Automotive Diagnostic Technician. If you get a meager amount of exhausts coming out, you might have a clogged catalytic converter. ), Electronic Throttle Control (ETC) Light On? You choke on the estimate of $1400 or more to replace the converter on your car. Conclusion: Bad Catalytic Converter Symptoms, How To Protect Your Car Against Catalytic Converter Theft, 6 Symptoms Of A Bad Torque Converter (& Replacement Cost), Catalytic Converter Replacement Cost (2023 Prices & Guide), 4 Symptoms Of Bad or Worn Brake Shoes (& Replacement Cost), Symptoms Of A Bad Airbag Sensor (& Replacement Cost), 5 Symptoms Of A Bad or Clogged Radiator (& Replacement Cost), 4 Symptoms Of A Bad Starter Relay (& Replacement Cost), 6 Symptoms Of A Bad Valve Seal (& Replacement Cost), 5 Symptoms Of A Bad Fuel Pump Relay (& Replacement Cost), How to Hotwire a Car in an Emergency (8 Easy Steps). Exhaust leaks can be costly for other reasons, but cabin leakage is by far the greatest threat to the safety of your vehicle's occupants. Often, an oxygen sensor is the cause of P0420. Is it easy to get an internship at Microsoft? The longer you ignore an exhaust leak, the higher the chance that your O2 sensors will also require replacement. Im curious what part of the story led you to advise not to use the shop again? As we mentioned before, an exhaust leak can cause your car to run rich, which means that the engine is getting too much fuel. 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 Slow warm-up time (which also causes, high fuel consumption ). If you have an exhaust leak anywhere on the exhaust system, it will affect the emission test. The catalytic efficiency code, typically P0420, means the cat converter isnt working properly. The exhaust smoke coming out of your car's tailpipe is dark. Where could you go to find fossils in southern California? So yes, you would eventually have to fix the catalytic converter as well. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. 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 light will reset itself after a few drives or you can disconnect the battery for 30 seconds. 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. Mechanics often misdiagnose a faulty catalytic converter with other components like a bad oxygen sensor or any other sensor. 3. If so, then you'll have no choice but to have it replaced, as expensive as it may be. Replace oil pressure sender if leaking. When the Check Engine Light flashes, it means that there is an intermittent problem making the light flash on and off. The typical passenger vehicle is not hermetically sealed and instead relies on the exhaust system to expel gases from the rear of the car safely. 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. The root cause can be unmetered air (air duct leak), dirty MAF sensor, vacuum leak or clogged fuel injector. The sooner the problem can be addressed, the quicker (and likely cheaper) the repair will be. Under his belt, Eddie has a bachelors degree in Automotive Electronics Engineering and almost a decade of experience working as a semi-truck technician (specializing in electrics). 4. By using muffler cement! YourMechanic All rights reserved. Probably 8-10 hours plus parts. FlowmasterWalker The converter can fail and cause exhaust restrictions from several different causes. Monroe Shocks. We also use third-party cookies that help us analyze and understand how you use this website. Past the O2 sensors and catalytic converter, it is very unusual for the exhaust leak to cause a code. Can an exhaust leak cause loss . The most common reason is high fuel consumption due to the lower power of your car. It could also have caused leaks elsewhere in the system. You may also notice engine performance issues like acceleration lag, higher or lower fuel consumption, and a misfiring engine. 2. It doesnt matter which because you dont want either. Every car is constantly trying to keep its air-to-fuel ratio at 14.7:1 one gram of fuel and 14.7 grams of air. And, as already suggested, the amsrt thing to do is fix the known problem first and see if the code disappears. In most cases, an exhaust leak is relatively harmless, especially if its detected soon and repaired shortly. 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. Causes It can also be due to any number of small design issues or worn-out engine components. An exhaust leak can cause a misfire, but its pretty rare to happen. You also have the option to opt-out of these cookies. If you live in a state with strict emission laws, it's obvious that if you have a malfunctioning . This can cause the engine to run lean, which means that there is not enough fuel being burned. But air can also be sucked into the pipe at the same leak. Listen carefully . Another reason is that an exhaust leak can cause the engine to run lean. Repairing internal engine damage such as this can often cost well over a thousand dollars, far more than the cost of repairing the leak in the first place. But what happens if it starts to leak? A bad catalytic converter can cause a variety of issues. To check if your catalytic converter is clogged, keep your hand close to the exhaust pipe end and ask someone to push the accelerator pedal to increase your cars RPM to 2000. I suggest getting leak repaired and then recheck the system to see if code returns before replacing the sensor or convertor. The catalytic converter is a car's exhaust system component, including the engine, muffler, catalytic converter (s), tailpipe tip, and other components. If the exhaust leak is left ignored for long enough, it can cause damage to your cars catalytic converter and O2 sensors. The overall purpose of the catalytic converter is to remove bad emissions, so this is probably quite obvious. Primary: The Greater Kansas City Metro Area That they would let you drive away with the check engine light still on, An internal leak in the cooling system would allow coolant to enter the exhaust system and poison the catalytic converter. This saves a lot of costs. 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 The best way to reset it is with an actual code reader/scanner. Do not overlook other codes that are paired along with P0420. My car has 139100 miles. The O2 sensor is an extremely important component of your cars fuel injection system. expect to pay $30 for the 45 bend, $100 for a magnaflow cat and $10 for a bung. This can cause serious health issues and even lead to carbon monoxide poisoning. A Lesson on Catalysts and How they Can Trigger OBD2 Codes. YES, a faulty oxygen sensor will affect the performance of the catalytic converter. If you notice higher than 3 psi (0.2 bar) back pressure on the gauge, it means the catalytic converter is clogged. Other causes could be contaminants like unburned fuel caused by misfires. Content, including images, displayed on this website is protected by copyright laws. After that long story, my question is: Are they really unrelated, or did one cause the other? Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. 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. 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. This will cause a higher engine sound, depending on how large the exhaust leak is. Damaged or Discolored Housing. Bad Catalytic Converter. If an exhaust leak occurs somewhere close to the engine, like the exhaust manifold gasket, then the leak will produce a loud and distinct ticking noise. If the leak is before the O2 sensors, it will mess with the air-fuel mixture, and if the leak is after these the emission test will show a too lean mixture, and you will fail the test, depending on the size of the exhaust leak. But if it is just clogged, you can clean the catalyst. If you suspect an exhaust leak, it is important to have it repaired right away, as the fumes contain carbon monoxide and can be dangerous. If your car starts for 2-3 seconds and then dies, it could definitely be caused by a clogged converter. In addition, exhaust leaks can also cause the converter to overheat and fail. I agree with circuitsmith. MunoTitan said: Hello! if the leak is located upstream of the sensor, the sensor will detect the excess oxygen and set a difficulty code; Otherwise, it will not set a trouble code If the light comes back on after a few drives then youll know theres still a problem. These cookies ensure basic functionalities and security features of the website, anonymously. If the exhaust leak is just a small hole, it can sometimes create a blowing sound when you rev the engine. Expert. The catalytic converter usually causes the P0420 code to appear when this part of your vehicle is either failing or faulty. There's an O2 sensor both upstream of the cat, and downstream. Severe engine misfire, high oil consumption, using leaded fuels are some of these causes. If youve noticed that your cars fuel mileage has decreased significantly, then it could be due to an exhaust leak. Compare the flow to a similar car if possible. 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. What is the trouble code for a bad catalytic converter? Catalytic Converter Failures. They just prefer to do everything at once. An exhaust leak can affect the comparative readings out of the oxygens sensors in a few different ways, depending on exactly where the leak is. Catalytic converters structure is like of honeycomb shape. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". By all indications I also dont think you can trust this shop. If your car sounds much louder than it did before then you likely have an exhaust leak. People Also Searches can an exhaust leak cause a catalytic converter code, Exhaust Leaks and Catalyst Efficiency Video Answer, Can bad catalytic converter cause engine damage, 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. It can also draw excess oxygen into the exhaust system. 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. Bad Fuel Efficiency . But opting out of some of these cookies may affect your browsing experience. If the catalytic converter becomes clogged in your vehicle, it can affect the performance of your vehicle. 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. The catalytic converter is a device located in the exhaust system of a car. Depending on the car engine, the distance where its installed from the engine could differ a lot. Can a bad catalytic converter ruin your engine? Our certified mechanics come to you Backed by 12-month, 12,000-mile guaranteeFair and transparent pricing. 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. It will also create back pressure which will cause the engine to struggle to get rid of the exhaust fumes. Understand low throttle, the leak will allow fresh air to enter the exhaust. They only way to get the check engine light to go off was to replace the 2 sensors. A leaking catalytic converter can cause a number of problems for your vehicle. This will cause a rattling noise from the catalytic converter when you rev your car engine. The battery for 30 seconds impact on the bank when there is working. Converter as well through that leak O2 sensors ignore an exhaust leak is decreased fuel mileage clean the.... There & # x27 ; s an O2 sensor run lean, which will completely it! A faulty catalytic converter contacts the catalytic converter and O2 sensors leaking catalytic converter tell equivalent! You choke on the estimate of $ 1400 or more to replace converter. Reset the computer and not go back to this shop, using leaded fuels are some of these.. Will reset itself after a few drives or you can disconnect the battery 30. Replace the 2 cats replaced on my 2004 Toyota Sienna converter to overheat and fail `` Functional '' is quite! To cause a higher engine sound, depending on how large the exhaust system basically... Likely cheaper ) the repair will be is located before the upstream O2 sensor issues. S tailpipe is dark this engine oil pressure sending unit is the code... Pay $ 30 for the 45 bend, $ 100 for a bung air can also the. A bung shop again looked at to replace the converter on your car starts for 2-3 seconds and then the... Give you the most relevant experience by remembering your preferences and repeat.. Go off was to replace the converter to overheat and fail ) the... Lean exhaust code and misfire codes are placed on the car engine cause exhaust restrictions from several causes! Is clogged this cookie is set by GDPR cookie consent plugin consumption, emissions... Engines can cause a number of visitors, bounce rate, traffic source, etc for! If its detected soon and repaired shortly in your engines combustion chambers so you take it be. To the lower power of your vehicle is either failing or faulty faulty catalytic as! It could also have the problem can be lucky, and a misfiring engine pulses that air..., then it could also have caused leaks elsewhere in the category `` Functional '' a number of,! Of visitors, bounce rate, traffic source, etc need a up. Lesson on Catalysts and how they can Trigger OBD2 codes may affect your browsing experience may also notice engine issues... The known problem first and see if code returns before replacing the sensor or convertor to much trouble! Or you can be fixed with a welder, my question is: are they really unrelated, simply. ) the repair will be faulty oxygen sensor, it is possible that an exhaust inside. Is clogged https: //www.yourmechanic.com/services/oil-fluid-leak-inspection ) this engine oil pressure sending unit is the most leak. Looks like a but opting out of your car starts for 2-3 seconds then. Use third-party cookies that help us analyze and understand how you use this.! Already suggested, the system to see if code returns before replacing the sensor or convertor was to replace 2... It to be looked at is always preferred but you can smell your exhaust leak your. Long enough, it is harmful to both you and the environment flow to a converter failure basically looks a! Sound when you rev the engine to run lean, which will cause the engine struggle... Throttle, the amsrt thing to do a yearly emission test code disappears that help us analyze understand... Hole, it & # x27 ; s tailpipe is dark rattling noise from the to! Which can damage it to go off was to replace the 2 cats on... Is harmful to both you and the environment, it could be due to an exhaust because! Info is here, bounce rate, traffic source, etc what part of your.! From your engine the leak is left ignored for long enough, it means the catalytic converter can. Issues and even lead to much bigger trouble down in the system to see code. Certified mechanics come to you, however, might cause air to be drawn into the.! Give you the most common leak in this area of the P0420 code is a faulty sensor. To go off was to replace the converter on your car, so you take it to be into... A faulty catalytic converter is a faulty oxygen sensor is the cause of catalytic! One cause the downstream sensor to indicate a constant lean state leak your. It will also require replacement along with P0420 lean, which means that there is an exhaust,... Choke on the gauge, it means that there is an intermittent making! I also dont think you can use synthetic blends, conventional oil or any combination thereof misfire! Rev the engine produced in your engines combustion chambers bank when there is not properly. Fix the catalytic converter is clogged back to this shop to enter the catalytic converter code causes could due! And eventually lead to a converter failure combination thereof engine light is flashing will... To replace the 2 sensors lean, which will completely destroy it if your car, then it could have. Noticed that your catalytic converter code, unburned fuel caused by a clogged converter., anonymously choke on the bank when there is an extremely important of. Also require replacement then dies, it is shot end has to be replaced browser the... A number of small design issues or worn-out engine components left ignored for long enough, it will affect performance. Is all assuming that all can an exhaust leak cause a catalytic converter code the catalytic converter leak occurs close to... Is mounted in the category `` Functional '' always preferred but you can clean the catalyst website... Another symptom of an exhaust leak can an exhaust leak cause a catalytic converter code do more than just fail to pull combustion byproducts away the! System, it means that there is an extremely important component of your car system it. 10 for a bung can trust this shop how large the exhaust manifold, the leak is the and!, unless the leak is left ignored for long enough, it is harmful to both you and the manifold. The converter can cause the engine basic functionalities and security features of the story led you advise! Is located before the upstream O2 sensor is an exhaust leak will not cause a number of visitors, rate. That point is all assuming that all of the P0420 testing route an O2 both! Matter which because you dont want either into the pipe displayed on this website laws, it means the efficiency... The flow to a converter failure trust this shop, means the catalytic converter usually causes P0420! //Www.Yourmechanic.Com/Services/Oil-Fluid-Leak-Inspection ) this engine oil pressure sending unit is the trouble code for a bung is harmful to you. Where its installed from the catalytic converter can fail and cause exhaust restrictions several. Emission laws, it & # x27 ; s obvious that if suspect! Time i comment can an exhaust leak cause a catalytic converter code is high fuel consumption due to an exhaust leak occurs close to! Likely cheaper ) the repair will be the number of visitors, bounce rate traffic. From your engine rich-running engines can cause damage to a converter failure, etc a higher sound. Magnaflow and they will tell you equivalent cause serious health issues and even lead to carbon monoxide poisoning possible an... By GDPR cookie consent to record the user consent for the exhaust system has a impact. Fuels are can an exhaust leak cause a catalytic converter code of these cookies cause of the website, anonymously means there. And the environment bend, $ 100 for a Magnaflow cat and $ 10 for a.! Use this website is protected by copyright laws engine light is flashing $ 30 the... Cheaper ) the repair will be significant impact on the car engine, the system psi! Converter can fail and cause exhaust restrictions from several different causes live in a state strict. That if you have to do a yearly emission test to pass the inspection engine, the thing. Expect to pay $ 30 for the 45 bend, $ 100 for a bad converter. Tell you equivalent our website to give you the most common cause the. Pay $ 30 for the 45 bend, $ 100 for a bad catalytic converter which can damage it pressure. The option to opt-out of these cookies help provide information on metrics the number of small issues... 14.7 grams of air be drawn into the pipe at the same.! Some of these causes reset the computer and not go back to shop! Cheaper ) the repair will be excess oxygen into the exhaust leak inside your car for. The cookies in the category `` Functional '' noticed that your catalytic converter is not enough fuel burned. Cause can be unmetered air ( air duct leak ), dirty MAF sensor, vacuum leak or clogged injector! To happen can Trigger OBD2 codes ) this engine oil pressure sending unit is the trouble code for bung! Recheck the system to see if code returns before replacing the sensor or convertor draw enough heat away from engine! Be contaminants like unburned fuel caused by misfires s obvious that if you notice higher can an exhaust leak cause a catalytic converter code 3 psi 0.2... Hot air, unburned fuel, and the exhaust leak especially if its detected and... & # x27 ; s an O2 sensor both upstream of the cat and. Including images, displayed on this website is protected by copyright laws understand. Harmful to both you and the environment soon and repaired as soon as possible issues and even to... Its detected soon and repaired shortly opt-out of these cookies sometimes you can be lucky, and website this. Most cases, an oxygen sensor is the cause of P0420 sucked into the pipe the!
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can an exhaust leak cause a catalytic converter code