From AZ About Car Exhaust Systems

Repair and maintenance service for clogged car exhaust pipes in HCM
Latest update date: February 13, 06

Exhaust system is an important part of the car's structure, playing a key role in ensuring operating performance and compliance with regulations on emission standards. In Vietnam, as the number of cars is increasing, especially in big cities like Hanoi and Ho Chi Minh City, the problem of maintaining, repairing and replacing car exhaust systems becomes extremely difficult. important. Genuine auto dealers, authorized vehicle repair service centers, as well as independent parts and service stores in Vietnam, provide solutions and services related to exhaust systems. vehicles, to meet the increasing needs of customers.

Choosing genuine replacement parts, as well as using reputable repair services, has become a top priority for many car owners in Vietnam. Thanhphong Auto is a reputable car exhaust system repair & maintenance unit, providing professional consulting to bring you the most effective solutions at the most reasonable cost.

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Exhaust system construction

Let's learn about the exhaust system by Thanhphong Auto to understand why it is so important in a car. 

The exhaust system includes: Exhaust pipe assembly, oxygen sensor, catalytic converter, silencer and exhaust pipe.

1. Exhaust duct assembly

Installed in series with the cylinders, directing the exhaust gases from each cylinder into the common pipe. This hose assembly can be made of stainless steel, aluminum, or some cast metal.

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Exhaust air duct assembly

2. Oxygen sensor

All gasoline engines use an oxygen sensor to determine the amount of excess air in the exhaust. From there, the machine can know whether to add or reduce the amount of oxygen (air) in the intake air, to save fuel for the vehicle. The oxygen sensor is located inside the exhaust manifold assembly right next to the tube.

3. Catalytic converter

It is used to convert carbon dioxide and hydrocarbons into CO2 and water vapor. Some other converters are also capable of converting toxic NOx into molecular nitrogen. This adapter is fixed between the exhaust assembly and the silencer.

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4. Silencer

Explosion of engine generates a lot of noise, especially diesel engine due to high compression ratio. Most silencers today use barriers and sound absorption. Some silencer systems also use fiberglass to absorb noise.

5. Exhaust gas pipes and lines

Connecting all the above components is the exhaust pipe that leads the air out. Exhaust pipes are usually made of stainless steel or steel-aluminum alloy, with long service life. 

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Exhaust pipes and lines

Operating principle of the car exhaust system

The exhaust system on a car has the function of removing harmful emissions from the engine. Its operating principle includes the following main steps:

Exhaust gas from the combustion chamber:

After the combustion of fuel in the combustion chamber, exhaust gases such as carbon dioxide (CO2), nitrogen oxides (NOx), harmful gases such as carbon monoxide (CO) and dust particles are created. These exhaust gases need to be removed from the engine.

Exhaust pipe:

Exhaust gases from the combustion chamber are pushed out of the engine through the exhaust pipe. The exhaust pipe is designed with a certain shape and size to create a steady stream of exhaust gases.

Exhaust gas processor:

On the exhaust pipe, there is an exhaust gas treatment unit consisting of the following components:

  • Ball catalyst: Helps convert harmful gases such as CO and hydrocarbons into CO2 and water vapor through oxidation reactions.
  • Particulate filter (DPF): Removes dust particles and other pollutants in the exhaust gas.
  • NOx processor: Uses a method such as reacting NOx with urea (AdBlue) to convert NOx into nitrogen and water.

End exhaust pipe:

After being processed, cleaner exhaust gases are released into the environment through the final exhaust pipe.

Sensors and control systems are used to monitor and adjust the exhaust gas treatment process, ensuring strict emissions standards are met. In addition, the exhaust system also plays a role in reducing engine noise and optimizing car performance.

Some “diseases” related to the exhaust system

1. Corrosion due to steam

The biggest enemy of exhaust systems is rust and corrosion. The presence of steam in the exhaust pipe and high temperatures are the main causes of system rust and corrosion. Water in the system is a byproduct of combustion and catalytic conversion, in addition to weather is also a cause of stagnant water in the car such as heavy rain, flooded roads.

2. Fuel consumption

When you notice your car is consuming more gas than usual, check your car's oxygen sensor. Replace the oxygen sensor when the vehicle has traveled 100.000km. Thanh Phong Auto commits that replacement parts are genuine products imported directly from the main production unit.

3. Noise

Silencers are also susceptible to rust and need to be replaced. When your car suddenly makes a loud noise, especially when accelerating, it's best to have it checked and replaced immediately. 

Frequently asked questions (FAQ)

1. What is the average lifespan of a car exhaust system?

The lifespan of an exhaust system depends on many factors such as spare parts quality, operating conditions and maintenance regime. Normally, the exhaust system can work well for about 5 - 7 years or 100.000 - 150.000 km. However, regular maintenance and timely replacement of damaged parts will help extend the life of the system.

2. How often is the recommended frequency of exhaust system maintenance?

Experts recommend periodically checking and maintaining the exhaust system every 20.000 - 30.000 km or 12 - 18 months, depending on vehicle usage conditions. Regular maintenance will help detect problems early and prevent serious damage.

3. What are the signs that the car exhaust system is having problems?

Some common signs of an exhaust system problem include:

  • Unusual noise from the engine or exhaust. Read the instruction article now How to fix noise coming from the car's engine & exhaust system Fast, simple, and most effective, applied by many experts.
  • Exhaust smell in the passenger compartment
  • Reduced performance and increased fuel consumption
  • The Check Engine light is on
  • Exhaust gas or water leak from the exhaust pipe

4. What are the harmful effects of not regularly maintaining the exhaust system?

Failure to regularly maintain your exhaust system can result in:

  • Reduced engine performance and increased fuel consumption
  • Increases toxic emissions, causing environmental pollution
  • Damage to related components such as catalytic converters and oxygen sensors
  • Reduced engine and exhaust system life
  • Increased risk of sudden failure and expensive repair costs

5. How to prolong the life of the car exhaust system?

To prolong the life of your exhaust system, you should:

  • Regular maintenance according to manufacturer's recommendations
  • Use high quality fuel that is suitable for the engine
  • Avoid going through deep water or rough roads
  • Do not let the engine operate under load for long periods of time
  • Promptly repair damage or leaks in the exhaust system

6. What effect does installing custom parts for the exhaust system have on the engine?

Installing custom exhaust system components such as a sports exhaust, custom muffler, or removing the catalytic converter can:

  • Change the character and volume of the exhaust sound
  • Affects engine performance and fuel consumption
  • Increases harmful emissions and violates emissions regulations
  • Causes damage to other engine parts due to changes in exhaust gas pressure

Therefore, the installation of custom parts for the exhaust system needs to be carefully considered and performed by experienced experts.

7. What is the difference between diesel engines and gasoline engines in terms of exhaust systems?

The exhaust system of a diesel engine usually:

  • Larger in size and more complex in structure than gasoline engines
  • Use a diesel particulate filter (DPF) to minimize the amount of particulates and soot in the exhaust
  • There is a separate NOx treatment system such as the SCR (Selective Catalytic Reduction) unit using AdBlue urea solution
  • Operates at higher temperatures and pressures, requiring better heat-resistant materials

Meanwhile, gasoline engine exhaust systems are often simpler and focus on minimizing CO, HC and NOx emissions through catalytic converters.

8. What impact does using poor quality fuel have on the exhaust system?

Using poor quality fuel or contaminated fuel can:

  • Clogging and damage to catalytic converters
  • Creates deposits and damages the oxygen sensor
  • Increased amount of dust particles and soot in the exhaust, clogging the diesel particulate filter (DPF)
  • Causes corrosion and rust to exhaust system parts
  • Reduced engine performance and increased fuel consumption

Therefore, using high quality fuel and from reputable suppliers is important to protect the exhaust system and maintain engine performance.

9. What effect does a broken oxygen sensor have on the exhaust system?

The oxygen sensor is an important component in the exhaust system, helping to monitor the oxygen concentration in the exhaust gas and adjust the fuel/air mixture to ensure efficient combustion. When the oxygen sensor is damaged, it can lead to:

  • Increased fuel consumption due to not optimally adjusted fuel/air mixture
  • Reduced engine performance and increased harmful emissions
  • Damage to catalytic converters due to fuel/air mixture being too rich or too lean
  • Activate the Check Engine light on the dashboard

Therefore, replacing a damaged oxygen sensor is very important to maintain the performance and longevity of the exhaust system.

10. Is it necessary to periodically clean the exhaust system?

Cleaning the exhaust system periodically is an important part of the car maintenance process. This helps:

  • Removes dirt, soot and other contaminants that accumulate in the exhaust system
  • Prevents clogging and damage to components such as diesel particulate filters (DPF), catalytic converters
  • Maintains exhaust system performance and longevity
  • Minimize harmful emissions and noise from exhaust pipes

The frequency of cleaning the exhaust system depends on usage conditions and engine type, but is generally recommended every 50.000-100.000 km or 2-3 years. Exhaust system cleaning should be performed by experts at reputable service centers to ensure effectiveness and safety.

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Cars Care Service Price Sheet At Thanh Phong Auto HCMC VietNam:

* The cars that we have mechanics: Mercedes, BMW, Audi, Lexus, Toyota, Honda, Mazda, Mitsubishi, Kia, Daewoo, Hyundai,Ford, Nissan, Volkswagen, Porsche, Chevrolet, Rand Rover, Innova, Fortuner, Vios, Fiat, Bugatti, Ferrari, Bentley, Hummer , Chrysler, Dodge, Renault, Cadillac, Volvo, Subaru, Daihatsu, Ssangyong, Roll-Royce, Peugeot, Smart Fortwo, Tobe M'car, Luxgen, Zotye, Haima, Geely, Baic, Hongqi, Cmc, Mini Cooper, Buick, Opel, Acura, Aston Martin, Vinfast, TQ Wuling, BYD.


To keep your vehicle running properly at all times, we offer a number of services that are carried out by our certified, expert auto service and repair technicians who have years of experience performing everything from oil changes to a complete engine overhaul.