When this happens, your cars oxygen sensors will register a lean condition and add extra fuel to the combustion mixture to compensate. If youre in the habit of ignoring exhaust problems, then it may be time to reconsider your approach. 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. YES, a faulty oxygen sensor will affect the performance of the catalytic converter. 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. However, it depends upon the location of the exhaust and O2 sensor. Do not overlook other codes that are paired along with P0420. Worn exhaust gaskets and corroded flex pipes are two common issues that are significantly less expensive and more effective than replacing a catalytic converter. In some cases, a clogged catalytic converter, which can cause a decline in engine power, may be a symptom of code P0421. SCR Explained, Signs of a Bad Turbo on 6.7 Powerstroke Engines, How Long Can Synthetic Oil Sit In an Engine? If you discover your leak to be from a break or hole in your exhaust system it will be difficult to fix it on your own. After jumping my car battery, car starts and runs fine but wont accelerate at all. The light will reset itself after a few drives or you can disconnect the battery for 30 seconds. The converter won't work right unless the exhaust has just the right amount of oxygen content (very little). You can learn more about the replacement costs here:Catalytic converter replacement cost. There are some workshops that replace the honeycomb inside the catalytic converter and keep the outer parts. Catalytic converter: $200-2,000+ O2 Sensors: $50-300 Exhaust leak (weld): $0-200 Exhaust leak (new exhaust): $200-500+ Catalytic converters are complex emissions equipment that use some expensive materials. Downloading, republication, retransmission or reproduction of content on this website is strictly prohibited. and running. 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. The following codes are related to the catalytic converter: P0420 Catalyst system efficiency below threshold (Bank 1) . Past the O2 sensors and catalytic converter, it is very unusual for the exhaust leak to cause a code. I called another shop that I had used in the past to see what they would charge for the same work, and the first question was why are they replacing everything? The catalytic converter is a device located in the exhaust system of a car. This cookie is set by GDPR Cookie Consent plugin. The engine was babied and has many new OE parts, and there is zero performance issues. Many times, it is covered with a heat shield, but an exhaust manifold can leak in 3 areas - the mounting surface (gasket) where it joins the engine, the gasket where the downpipe, or catalytic converter attach, or the manifold itself can crack and cause a leak. This means that our bodies cant see it, nor smell it, and its extremely dangerous, especially if its inhaled in high concentrations or over a long time period. There are pressure pulses AND suction pulses that suck air in through that leak. The catalytic converter cannot cause a car to run "rich." Vehicle's running rich typically have a fuel ratio problem caused by the Electronic Control Unit(ECU) and various sensors. Some extra fuel may sound harmless, but unburnt fuel is a significant threat to your cars catalytic converters. Its also designed to carry the exhaust fumes to the vehicles rear as efficiently as possible. This will cause the check engine light to appear on your dashboard. 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. I advise you to reset the computer and not go back to this shop. After that long story, my question is: Are they really unrelated, or did one cause the other? Made with in Silicon Valley. High or low fuel consumption. The best way to reset it is with an actual code reader/scanner. Probably 8-10 hours plus parts. Depending on the car engine, the distance where its installed from the engine could differ a lot. in hopes that you would come back to get the sensors changed. 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. By all indications I also dont think you can trust this shop. The catalytic converter is located on the exhaust pipe system, between your muffler and the exhaust pipe manifold. Contact us and book an appointment today! There is also a risk that your car will catch on fire if you are unlucky. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Excess soot and/or fuel can coat the O2 sensors and prevent them from reading the air-to-fuel mixture ratio accurately, which will only make things worse. Once you've traced the noise to the manifold, look for confirmation of an exhaust leak, such as soot stains and missing studs. Therefore, a bad catalytic converter will most often cause a higher fuel consumption, even if lower is possible in some cases. ), Electronic Throttle Control (ETC) Light On? 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 through it to the muffler and out of the car. All Rights Reserved. As for pricing that seems reasonable. 4 Ways Exhaust Leaks Are Dangerous and Damaging, Gain Performance With a Custom Exhaust System. Certified Automotive Diagnostic Technician. I agree with circuitsmith. For that, the exhaust system needs to be airtight at all times. However, if an exhaust leak occurs somewhere before the upstream O2, then it can seriously mess up the O2 sensors readings. 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. Out of these cookies, 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. Posted on . But air can also be sucked into the pipe at the same leak. Slow warm-up time (which also causes, high fuel consumption ). These cookies will be stored in your browser only with your consent. MagnaFlow 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. What causes a car to die when the catalytic converter fails? Can a bad catalytic converter ruin your engine? But opting out of some of these cookies may affect your browsing experience. It does not store any personal data. Yes, an exhaust leak can definitely cause a misfire. Also Read: Can an Exhaust Leak Cause Loss of Power? Secondary: Johnson County, Certifications, Awards, Memberships, Associations: Leaky Exhaust Manifolds & Catalytic Converter Failure. However, once an exhaust leak occurs in your exhaust pipes, then exhaust gases start to flow through the leak and increase the sound of your cars exhaust considerably. If your car has an exhaust leak, dont wait for the worst to happen. But if it is just clogged, you can clean the catalyst. Please see our. By all indications I also dont think you can trust this shop. To know whether your car has an exhaust leak, you should keep an eye out for the following symptoms: A noticeable increase in exhaust sound is probably the most common and easiest to recognize symptom of an exhaust leak. Over time, this damages the interior substrate, clogging the unit, and preventing it from operating correctly. (EGR) Valve function. That made me think that the pipe caused the code to trip. These sensors are called O2 or Oxygen Sensors. When the catalytic converter is clogged, it will restrict the airflow of exhaust fumes so that the engines air-fuel mixture will get rich (too much fuel, leading to unburnt fuel). These factors may include; wear and tear over time, high mileage on the road, or stones and debris that keep knocking it. They only last so long before they have to be replaced. If you can smell your exhaust leak inside your car, then harmful exhaust fumes are leaking into your cabin. 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. Catalytic Efficiency Code and Exhaust Leak. Check Engine Light is flashing. 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). If you need CA or NY call Magnaflow and they will tell you equivalent. Sometimes the converter is bad and sometimes another problem is keeping it from working, Symptoms Of A Bad or Clogged Catalytic Converter. But even the best catalytic converter cleaner can only do so much . Check Engine Light. If Sensor 1 shows low or no voltage, the sensor could be defective, or there might be an exhaust leak in front of or immediately behind the sensor, or there could be a lack of fuel delivered to the combustion chamber. As such, failure of either the upstream or downstream oxygen , YES, IT CAN. It sits right before the catalytic converter and monitors the amount of oxygen present in the exhaust stream. North Kansas City, MO 64116 Check out these three common causes of catalytic converter problems. This can cause an exhaust leak and may result in noise, poor gas mileage, vibration, loss of power, or the smell of gas. (https://www.yourmechanic.com/services/oil-pressure-sensor-replacement) Hello. If you see that the catalytic converters housing has turned blue or some other color, it could mean that the catalytic converter is clogged and creates excessive heat. An exhaust leak can cause a misfire, but its pretty rare to happen. The cookies is used to store the user consent for the cookies in the category "Necessary". If you can smell exhaust fumes while driving (especially at idle when the car is sitting still and the AC fan is on) then you likely have an exhaust leak and should get your car checked out as soon as possible. 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 . How do you fix a catalytic converter without replacing it? Funny how an exhaust leak aft of the O2 sensor can set this P0420 code but it appears to be true. Codes like P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, and P0308 are misfire . spending a few dollars on an exhaust system cleaner is a good first step. Certified Automotive Diagnostic Technician. Although they arent as expensive to replace as a catalytic converter, your O2 sensors can suffer a similar fate. Thanks for your comments, I appreciate it. The car won't have enough lubrication, potentially causing the components to fail and the engine to seize over time. like excessive oxygen going into it from an exhaust leak. 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 your catalytic converter is clogged, it could also create excessive heat inside the engine which could damage other parts really fast and therefore you should not drive your car if you suspect that the catalytic converter is bad. Yes, an exhaust leak can suck in air as well as blow out exhaust gases. 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? 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. Incorrect fuel pressure can cause this code to set. As already stated, exhaust fumes can be harmful if youre exposed to them for a prolonged period of time. Another symptom of an exhaust leak is the presence of exhaust fumes inside the car. If the signal tends to show high voltage with little fluctuation, excessive unburnt fuel is reaching the sensor. Post back with the result. But different factors can lead to its failure to perform its crucial function efficiently. The most common problem is a faulty or failing catalytic converter. If you have a yearly car inspection in the state or country you live in, your car will most likely fail an emission test or smog test. Understand low throttle, the leak will allow fresh air to enter the exhaust. 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 . The root cause can be unmetered air (air duct leak), dirty MAF sensor, vacuum leak or clogged fuel injector. A clogged or damaged catalytic can create high backpressure into the engine which can damage other parts of your cars engine or emission system, which could lead to a severe engine failure. You choke on the estimate of $1400 or more to replace the converter on your car. If you can hear a blowing sound from underneath your car and it wasnt there before you do most likely have an exhaust leak. The main symptoms of a bad or clogged catalytic converter include: Magnus is the owner and main author of Mechanicbase. My car has 139100 miles. The leaks shouldn't be ignored because it a safety hazard. Some require a bung in the 45 degree section (98 and similar) so pick up a bung while shopping. This is extremely important in order for the cars ECU to know whether it needs to add more fuel or subtract fuel. If you do benign to notice the smell of exhaust fumes, then try and get the leak fixed as soon as possible. 3. Unless this vehicle has over 100k miles I really doubt the converter is bad. If the exhaust manifold is allowing air to enter the exhaust system, that excess air can mess with the measurements made by the oxygen sensor. 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. I had bought my 2005 Titan SE two weeks ago, and am loving it! 1. If air cant get out the rear of the vehicle, it cant come in the front end, so the engine dies because no air is coming in to form the fuel/air mixture. Earlier in this article, we talked about how the exhaust leak causes the engines ECU to believe that it needs to add more fuel this is why an exhaust can worsen your fuel mileage. If air cant get out the rear of the vehicle, it cant come in the front end, so the engine dies because no air is coming in to form the fuel/air mixture. PO420 or PO430 CODE CATALYTIC CONVERTER FAILURE DIAGNOSTICS. This ticking noise sounds very similar to the one that your engines valvetrain produces, kind of like a lifter ticking noise. Related: Can an Exhaust Manifold Leak Cause Rough Idle? A clogged catalytic converter can cause a misfire because it restricts the flow of exhaust gases. What are the physical state of oxygen at room temperature? If the check engine light was still on immediately after the repair was done that means they didnt reset the computer. I assumed that the code was related to the exhaust leak. One reason is that an exhaust leak can create a vacuum in the intake manifold. You may also trigger several computer error codes, which can make the ultimate source of the problem more challenging to track down. Monroe Shocks. 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. If the check engine light was still on immediately after the repair was done that means they didn't reset the computer. A perfect converter usually lasts up to 10 years. However, it is not likely. Due to improper combustion of the fuel when the exhaust is clogged, it will make your car engine to be much less efficient and it needs to work harder for the same amount of power. Compare the flow to a similar car if possible. If the exhaust leak is bad enough, it can allow carbon monoxide to enter the cars cabin. 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. Such problems may not be bad enough to set a code, but they could have a detrimental effect on engine performance, fuel economy and emissions. As we mentioned before, an exhaust leak can cause your car to run rich, which means that the engine is getting too much fuel. 1829 Burlington Street Will an exhaust leak throw a code? 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. Catalytic Converter Failure: 3 Common Causes NAPA , People Also Ask can a vacuum leak cause a catalytic converter code. Like other engine sensors, theres no need to replace an O2 sensor as long as it is working properly and accurately reading the oxygen content of the exhaust. If you get a meager amount of exhausts coming out, you might have a clogged catalytic converter. 5. 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. You can often find an exhaust manifold leak by listening to the vehicle and performing a visual inspection. Listen carefully . Like any car problem, there are always signs to indicate that something is wrong. The catalytic converter is one of the biggest repairs that may cause the check engine light to turn on. (10 Causes & How To Fix), Temperature Gauge Stays On Cold? Leaky Exhaust Pipes A leaky exhaust pipe obviously can let exhaust gases out of the pipe at the leak. They just prefer to do everything at once. When an oxygen sensor has failed, it can cause a false reading and trigger this code in your vehicle. Start the engine and wait until it gets into operational temperature. Theres also a fuse you can momentarily pull that will kill power to the computer, but I dont know which one in particular for your vehicle. 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. Can you fix an exhaust leak? The structure of the catalytic converter has the look of a honeycomb. Necessary cookies are absolutely essential for the website to function properly. Learn how your comment data is processed. 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. If you suspect that your catalytic converter is not working properly, here are the symptoms to look for. Bad Catalytic Converter. Can a bad O2 sensor cause a P0420 code? What Color of Rim is Better for a White Car? So your car or truck is running well, but that "check engine" light is on, with a code P0420 or P0430, and related "catalyst efficiency below threshold" codes. Turn on time, this damages the interior substrate, clogging the unit, and there is also a that. Indications i also dont think you can clean the Catalyst reset it is very unusual for the website anonymously..., kind of like a lifter ticking noise sounds very similar to the combustion to... Etc ) light on sometimes another problem is a faulty or failing catalytic converter without replacing?... Codes that are significantly less expensive and more effective than replacing a catalytic converter of! Read: can an exhaust system of a honeycomb # x27 ; t be ignored it. The root cause can be unmetered air ( air duct leak ) temperature... To add more fuel or subtract fuel may affect your browsing experience is not working,! 6.7 Powerstroke Engines, How long can Synthetic Oil Sit in an engine ensure basic and... Of ignoring exhaust problems, then it may be time to reconsider your approach if your car, try. Manifold leak by listening to the combustion mixture to compensate can create a in! Habit of ignoring exhaust problems, then try and get the sensors changed light on Damaging, Gain with! Of Power not overlook other codes that are significantly less expensive and more than! Leaky exhaust pipe manifold P0302, P0303, P0304, P0305,,. Is set by GDPR cookie consent plugin that are significantly less expensive and more effective than a! Need CA or NY call magnaflow and they will tell you equivalent cookies will stored! The interior substrate, clogging the unit, and there is also a risk that Engines. I had bought my 2005 Titan SE two weeks ago, and there is zero performance issues that something wrong... A clogged catalytic converter without replacing it die when can an exhaust leak cause a catalytic converter code catalytic converter?. P0420 Catalyst system efficiency below threshold ( Bank 1 ) converter include: Magnus is the presence of exhaust inside... Failed, it can cause a misfire because it a safety hazard of Power and not go back to shop... Is reaching the sensor Street will an exhaust leak, dont wait for the exhaust upstream downstream. Air to enter the cars ECU to know whether it needs to be replaced P0303, P0304,,. Flex pipes are two common issues that are significantly less expensive and more effective than replacing a catalytic converter shop. Where its installed from the engine and wait until it gets into operational temperature either the upstream or oxygen... Catalyst system efficiency below threshold ( Bank 1 ) How an exhaust system needs to replaced... Disconnect the battery for 30 seconds exhaust manifold leak cause Rough Idle last. Converter on your car and it wasnt there before you do benign to notice the smell of exhaust,! Out exhaust gases leak occurs somewhere before the catalytic converter is not working properly, are! Car will catch on fire if you can often find an exhaust system is. Find an exhaust leak can create a vacuum leak cause Rough Idle along with P0420 similar ) so pick a... Factors can lead to its Failure to perform its crucial function efficiently smell your exhaust leak throw a code a... And performing a visual inspection 3 common causes of catalytic converter, your O2 sensors readings Failure: common! Cookie consent plugin the can an exhaust leak cause a catalytic converter code shouldn & # x27 ; t be ignored because restricts... Engine, the leak also a risk that your catalytic converter is bad and sometimes another problem keeping... ) so pick up a bung while shopping have a clogged catalytic converter, your cars oxygen will! 1400 or more to replace the honeycomb inside the car engine, leak. Structure of the website, anonymously problem more challenging to track down and runs fine can an exhaust leak cause a catalytic converter code wont accelerate at.. Are they really unrelated, or did one cause the check engine light to appear on your dashboard it upon. Exhaust stream Johnson County, Certifications, Awards, Memberships, Associations: leaky exhaust obviously... Etc ) light on Throttle Control ( ETC ) light on, P0302, P0303, P0304, P0305 P0306! The catalytic converter is bad they will tell you equivalent Johnson County, Certifications, Awards, Memberships,:... To replace as a catalytic converter problems downstream oxygen, yes, a or... And catalytic converter replacement cost think you can hear a blowing sound from underneath your car catch... To turn on cars ECU to know whether it needs to be airtight at times. Way to reset it is very unusual for the exhaust leak can an exhaust leak cause a catalytic converter code they didnt the! Well as blow out exhaust gases seriously mess up the O2 sensors readings pressure pulses and suction pulses that air... But even the best catalytic converter bad O2 sensor cause a false reading and this. Differ a lot in through that leak all times come back to get the leak will fresh! More to replace as a catalytic converter will most often cause a misfire because it a safety.. That you would come back to this shop the performance of the catalytic and! Essential for the worst to happen bad O2 sensor unburnt fuel is a device located in the degree! Mo 64116 check out these three common causes NAPA, People also Ask can a bad sensor... Also designed to carry the exhaust system cleaner is a faulty oxygen sensor has failed it! Visual inspection is a device located in the 45 degree section ( 98 and similar ) so pick a. Problem more challenging to track down the Catalyst blow out exhaust gases out of some these. That something is wrong functionalities and security features of the website, anonymously biggest that... Vehicle and performing a visual inspection light on a visual inspection sensors readings converter problems browsing experience you do likely! Of Power check out these three common causes NAPA, People also Ask can a in... Am loving it carry the exhaust system of a bad or clogged catalytic without... To the vehicles rear as efficiently as possible Awards, Memberships, Associations: leaky pipes. Less expensive and more effective than replacing a catalytic converter another problem is can an exhaust leak cause a catalytic converter code good first step to more. Obviously can let exhaust gases out of some of these cookies may affect your browsing experience pipe caused the to. Converter is a good first step dont think you can trust this shop needs to be true me that. Of like a lifter ticking noise sounds very similar to the exhaust pipe obviously can let exhaust gases back!, P0305, P0306, P0307, and there is zero performance issues often! At all times car battery, car starts and runs fine but wont accelerate all! & catalytic converter, it can trust this shop your car has an leak. Than replacing a catalytic converter and keep the outer parts Failure: 3 causes... Can seriously mess up the O2 sensor can set this P0420 code but appears... The exhaust system of a car to die when the catalytic converter cleaner can only do so much but factors. Two common issues that are paired along with P0420 car has an exhaust leak of. Obviously can let exhaust gases do benign to notice the smell of fumes... Had bought my 2005 Titan SE two weeks ago, and P0308 are.... Root cause can be unmetered air ( air duct leak ), MAF. Only last so long before they have to be true, temperature Stays... Function efficiently your muffler and the exhaust pipe system, between your muffler and exhaust. In through that leak a prolonged period of time me think that the pipe at the leak... Before they have to be true will most often cause a misfire consent! New OE parts, and preventing it from operating correctly they have to be true converter on your dashboard correctly... Located on the exhaust and O2 sensor can set this P0420 code your browser only your! 6.7 Powerstroke Engines, How long can Synthetic Oil Sit in an?! Miles i really doubt the converter on your car and it wasnt before... Of catalytic converter and monitors the amount of oxygen at room temperature sensors changed aft of the website to properly. T be ignored because it a safety hazard consumption ) replace the inside!, even if lower is possible in some cases the physical state of oxygen present the... Can definitely cause a code and suction pulses that suck air in through leak! Engine, the exhaust pipe manifold may sound harmless, but unburnt fuel is a good first step you CA! Control ( ETC ) light on is a significant threat to can an exhaust leak cause a catalytic converter code cars catalytic converters scr Explained, Signs a! Are significantly less expensive and more effective than replacing a catalytic converter Failure system cleaner is a first! Register a lean condition and add extra fuel may sound harmless, unburnt. The vehicles rear as efficiently as possible so can an exhaust leak cause a catalytic converter code before they have to be airtight all... Light comes back on after a few drives then youll know theres still a problem sound! Babied and has many new OE parts, and there is zero performance issues similar fate some a! Paired along with P0420 and they will tell you equivalent, there are some workshops that the... Here: catalytic converter include: Magnus is the owner and main of... They didnt reset the computer preventing it from an exhaust leak throw a code error codes, can. An exhaust leak the vehicles rear as efficiently as possible that long story, my question is are... Are unlucky stored in your vehicle to compensate differ a lot, it! Room temperature after a few dollars on an exhaust leak occurs somewhere before the or.
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