Does Diesel Have a Catalytic Converter?

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Nowadays, environmental pollution has become a great deal to focus on. The toxications and gas exhausted from your car engine are much responsible for this pollution. Diesel catalytic converters are known as the most extreme exhaust emission control devices. It doesn’t only filter the machine but also works as the chemical composition of the exhaust gases.

To know more about Diesel catalytic converters, keep reading this article.

Diesel Catalytic Converter

A catalytic converter is undoubtedly an essential part of your car engine. But what’s the unique thing about a diesel catalytic converter? 

The diesel catalytic converter is designed to catch and remove pollutant particulars from the engine quickly. You can use this catalytic converter in many forms. From personal transport to a commercial vehicle, the converter fits in all at best.

The daily use of cars, trucks, and vehicles causes massive pollutants in the environment. This is a threat to our world health. Using a diesel catalytic converter in your car engine makes these toxications disappear. You can fit the converter with the internal combustion engine. 

Though you can use gasoline instead of diesel, the diesel one works surprisingly in much cooler ways. 

How Does Diesel Catalytic Converter Work?

A diesel catalytic converter is more than just a pollution filter for your engine. This works as a rearranger. This device changes the chemical components of exhaust gases by rearranging the atoms from which they’re made. Mainly the diesel catalytic converter completes the process in four stages. As: EGR ( exhaust gas recirculation), DPF ( Diesel particulate filtration), DOC (Diesel oxidization catalyst), and SCR ( selective catalytic reduction).

Molecules of polluting gases are pumped from the engine past the honeycomb catalysts. These catalysts are generally made from platinum-palladium or rhodium. The catalyst splits up the molecules into their atoms. Then the atoms recombine into molecules of relatively harmless substances. Such as Carbon dioxide, water, or nitrogen. These components blow out safely through the exhaust. 

Diesel basically uses a two-way oxidation catalyst. The diesel engine produces many tailpipe emissions of nitrogen oxides. This helps to reduce particular emissions slightly. Specifically, they tackle a soluble organic fraction, which is a known type of particulate.

Besides, there is another essential part of every diesel system. You’ll get a DOC or Diesel oxidant catalyst in this kind of device. This helps to convert carbon monoxide into carbon dioxide by breaking down un-spent fuel. Being the smallest component, DOC holds the highest recycling value. You can consider it as the first component in the exhaust system. 

Also, the Diesel particulate filter or DPF is known as the particulate capturer. This removes the pollutants through the regeneration process. In this process, the converter will let the particulate enter from the inlet. Here the regeneration process breaks down and removes the pollutants. This process is quite similar to DOC. This DPF needs to be heated at the highest temperature to burn up the particulars.

Another part of the Catalytic converter is the SCR or selective catalytic converter. This is quite the opposite of the DOC part. Being a large part, this holds little value. This part usually carries NOx reduction out of the engine. This thing increases the recycling value of the SCR part of the converter.

Related: Black Soot In Exhaust Tailpipe “Why?” Explanation

Cost of Diesel Catalytic Converter

A diesel catalytic converter always costs a little more than a gasoline catalytic converter. But obviously, the cost is worth the expansion. Diesel fuel requires less amount than gasoline. If you think about the overall costs, both of the options cost almost the same.

How Much Is a Diesel Catalytic Converter Worth?

Holding worldwide demand for diesel catalytic converters, price is a significant part to consider. Though the price range will differ with the type and quality, you choose. The global market has quite a vast range of catalytic converters. 

Here you’ll get the exact price of various diesel catalytic converters depending on the material and market demand.

  • Small foreign catalytic converter – $108 – $141
  • Medium foreign catalytic converter- $121- $203
  • Large foreign catalytic converter- $202- $392
  • XL foreign catalytic converter- $398- $454
  • Foreign pre-catalytic converter – $48- $71
  • Exotic catalytic converter – $225 – $450
  • High-grade domestic catalytic converter- $145- $192
  • Pre- domestic catalytic converter- $27- $62
  • Torpedo catalytic converter- $80 – $250
  • Small catalytic converter – $83 – $158
  • Large catalytic converter- $154- $260
  • Large bread loaf catalytic converter- $138- $392
  • Small bread loaf catalytic converter – $104- $229
  • The foreign lite catalytic converter – $48- $75
  • Large Chrysler catalytic converter- $101- $189
  • The regular domestic catalytic converter- $68 – $104
  • Bread catalytic converter- $14 – $124
  • Diesel catalytic converter – $12- $124
  • Small foil catalytic converter – $12 – $ 32
  • Large foil catalytic converter – $29 – $64
  • Foil catalytic converter – $6 – $23
  • Half-cat catalytic converter – Varies on different factors.
  • Aftermarket catalytic converter – $10
  • PDF catalytic converter – $9- $479
  • AC catalytic converter – $46 – $222

The price may seem a little high. But according to types and methods of processing, every diesel catalytic converters vary. If you consider another advantage of this cat device, you would not feel any gasoline price difference. You should just grab the one according to your engine type and budget. Once you get the perfect one, this won’t carry the regular maintenance hassle at all.

Related- Bosal Catalytic Converter Review

Do You Need a Catalytic Converter on a Diesel?

The answer to this question can directly be explained. Yes, you would undoubtedly need a catalytic converter on a diesel.

Whether it’s a small car, truck, or commercial and industrial vehicle, you would need a catalytic converter on all types of diesel-powered vehicles. This device would reduce the HC ( hydrocarbons), PM ( particulate matter), CM ( carbon monoxide), and all the other kinds of emissions.

Modern diesel engines produce carbon components that haven’t been burnt to carbon dioxide. These particles seem visible and work in a more relaxed way than gasoline.

Related: Best Exhaust For Honda Accord v6 (Review) In 2022

Do All Diesel Engines Have Catalytic Converters?

Yes, every diesel system has a catalytic converter. This is performed in the diesel catalyst system for purifying the toxic particles in the diesel engine.

This is known as a Diesel oxidant catalyst. The converter turns all the toxications into a harmless gas. To obtain the gases and reduce them to harmless ones, every diesel engine would need a catalytic converter.

In modern times, people choose diesel engines over gasoline because of their flexibility and useful working methods. And every diesel engine would require a catalytic converter to complete the whole pollution imitation process. 

Do All Diesel Cars Have DPF?

All-new diesel has a DPF fitted. In 2009, these became mandatory for cars and trucks emitting black smoke from their exhaust pipes – but not all of them are equipped with one. It’s easy enough to tell if your car lacks this essential equipment though: soot spewing out the back can be an obvious sign that something isn’t right inside its engine compartment.

What Does a Diesel Catalytic Converter Look Like

This machine is designed to convert noxious emissions from cars and trucks. These include carbon dioxide, soot particulate matter (PM), hydrocarbon gas, or vapor but not water vapor because it has been shown that under certain circumstances this would actually have an anti-fog effect on the glass surface of your vehicle’s windows. It can also reduce chemical oxygen demand(COD).

catalytic converter for diesel

What Is the Best Catalytic Converter for Diesel Trucks

MagnaFlow has developed a universal converter that is perfect for diesel, offering maximum performance and durability. Your diesel truck is a powerhouse on the road and it’s important to keep your engine running optimally. A MagnaFlow universal catalytic converter will help you achieve that goal by reducing harmful emissions and increasing fuel economy.

How Long Does a Catalytic Converter Last on a Diesel?

The catalytic converter is more than a necessity in modern vehicles. This fantastic emission control device has another attractive part of getting chosen. This is their long-time guarantee. The catalytic converter gives you access to use it for life as long as your vehicle keeps running. You might not need to replace it in your lifetime. 

The average life is about ten years. It goes more than 100,000 miles, which is 160,934 kilometers, by purchasing one time. However, most companies claim a lifetime guarantee. You’ll get a replacement for free if any defect shows up. The best thing about the catalytic converter is they’re mostly maintenance-free. Unlike tires, brakes,s, or other parts of a car, this one doesn’t require extra hassle time after time.

Once you get the perfect catalytic converter, according to your car’s ICE demand, this goes till the end. Through all this time, the converter won’t only keep the car safe but also will save the environment from pollution and future destruction.

Related: Best High Flow Catalytic Converter (Review) Of 2021

Will a Diesel Pass Emissions Without a Cat?

No, your car can’t pass emissions without a cat. Catalytic converters must be installed in your vehicle for pollution reduction. A cat quickly gets all the pollutants in one place.

Later here, by the regeneration process pall, the components break themselves and turn into non-threatening gases. Without a Catalytic converter, your car engine will reduce the black and toxic gases. These phases can hamper environmental balance. Smelling these gases can make anyone and anything unhealthy.

Diesel power emissions are usually at the emission section according to gasoline. However, the working ways and processes are different from one another. The diesel CAt oxidizes carbon monoxide, hydrocarbons, and SOF and turns them into non-toxic gases by breaking and regenerating them.

Without the Cot, neither is the reduction possible nor the oxidation. For both of them, you must install a catalytic converter in your car engine. 

The Difference Between Diesel and Gas Engines

Engines mainly work in two ways. One is with the help of diesel, and the other one is with the help of a gas engine. However, diesel and gasoline both turn fuel into power by buying and regenerating. Between these two, diesel is considered more relaxed than gasoline. There are some core differences between these two. 

Let’s know the elaboration of the differentiation between diesel and gas engines:

Thermal efficiency

This is known as the core difference between diesel and gas engines. A diesel engine serves 20%v more efficiency than a gas engine. 


Gas engines consist of some bounds and restrictions. On the other hand, diesel engines serve a massive variety of vehicles. You can use them on trucks, cars, industrial and commercial vehicles, etc.

Low operating cost

As diesel engines can serve more efficiently, they automatically decrease the operating cost. The combination of low operating costs and better efficiency makes the diesel engine more reliable.

Life cycle

The gas engine life cycle is not as long as diesel engines because the diesel engine world is in a slow revolution per minute. This costs less wear and tear which makes the diesel engine last longer than a gas one.


The diesel engine doesn’t consist of any spark. This holds a higher compression ratio than the gas engine. Generally, the engine doesn’t even use any spark which makes it a compression combustion engine. 

On the other hand, the Gasoline engine consists of spark fire combustion. This also utilizes diesel engine compression.

Life expectancy

Life expectancy is another remarkable difference between gas and diesel engines. In this case, Diesel engines hold the crown. As the RPM is low and torque is high in the diesel engine, this lasts longer. These are designed in a powerful way that makes the whole system thicker as well as higher. All these factors prove diesel engine life expectancy is more than a gas engine.

Recycling Diesel Catalytic Converters

Diesel catalytic converters are used in various forms. From personal transport, and small cars to commercial and industrial vehicles, you’ll get Diesel engine’s presence everywhere. However, the converters vary in size, dimension, and weight. 

Diesel catalytic converters are always on dem, and. So if you have an excellent diesel cat and want to sell or recycle it, you need to do a little research here. You can earn the right amount of money by exchanging or selling your catalytic converter. Being a diesel one, this goes with more cars and vehicles. This thing increases your options.

For recycling, you should research various websites. You can contact them through the website or directly call them.

The demand for Diesel Cat

Since the year 1992, catalytic converters have been used in a car engines. This is efficient enough as well as robust to make the pollution emission. Since the start of 2001, diesel cars have replaced all the other alternatives. Now, most modern vehicles require diesel catalytic converters to serve better performance with your car.

Whether it’s your personal vehicle or an industrial truck, Diesel converters make your car engine work efficiently. According to price, people choose diesel catalytic converter as the first choice because of all the plus points.

Final words

A diesel catalytic converter can be an excellent choice for the emission control of your car. This increases engine efficiency; on the other hand, it saves the environment. The government in every country is now super conscious of the pollution issue. The car engine is considered the most significant reason behind the problem. So, choosing the right kind of catalytic converter is more than a luxury.

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