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Catalytic converter and soot particle filter - important for the environment

In the late 1970s, the catalytic converter was first introduced in the USA as a component that could drastically reduce the pollutant emissions of combustion engines. Initially as an unregulated, later as a regulated 3-way catalytic converter, the technical innovation also found its way into automotive engineering in Germany in the 1980s. Closely linked to this is the changeover from leaded petrol to unleaded petrol, because catalytic converters could not tolerate this additive. Today, there is no leaded gasoline at all and the catalytic converter has proven itself as an instrument for air pollution control in passenger cars.

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Item No.:
099-820_BOSAL
Manufacturer:
BOSAL
Part Number:
099-820
EAN-No.:
3351640998200

producttype: Catalytic Converter
Einbauposition: vorne
Supplementary Article/Supplementary Info: with add-on material
articlenumber: 099-820
oemnumbers: 099-820
manufacturer: BOSAL
oenumbers: 18301435663
259.04 EUR

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Item No.:
823-475_BOSAL
Manufacturer:
BOSAL
Part Number:
823-475
EAN-No.:
3351648234751

articlenumber: 823-475
oemnumbers: 823-475
20.66 EUR

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Item No.:
889-497_BOSAL
Manufacturer:
BOSAL
Part Number:
889-497
EAN-No.:
3351648894979

articlenumber: 889-497
oemnumbers: 889-497
35.88 EUR

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-209.36 EUR
BOSAL Catalytic Converter 099-330
Item No.:
099-330_BOSAL
Manufacturer:
BOSAL
Part Number:
099-330
EAN-No.:
3351640993304

producttype: Catalytic Converter
articlenumber: 099-330
Einbauposition: vorne
Supplementary Article/Supplementary Info: with add-on material
manufacturer: BOSAL
oenumbers: 8200265169
oemnumbers: 099-330
MSRP 465.05 EUR 255.69 EUR

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-365.05 EUR
BOSAL Catalytic Converter 090-177
Item No.:
090-177_BOSAL
Manufacturer:
BOSAL
Part Number:
090-177
EAN-No.:
3351640901774

producttype: Catalytic Converter
Einbauposition: vorne
Supplementary Article/Supplementary Info: with add-on material
oemnumbers: 090-177
articlenumber: 090-177
manufacturer: BOSAL
oenumbers: 2711401609
MSRP 732.56 EUR 367.51 EUR

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Item No.:
099-637_BOSAL
Manufacturer:
BOSAL
Part Number:
099-637
EAN-No.:
3351640996374

producttype: Catalytic Converter
oenumbers: 855132
Supplementary Article/Supplementary Info: with add-on material
oemnumbers: 099-637
Einbauposition: mitte
manufacturer: BOSAL
articlenumber: 099-637
192.69 EUR

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BOSAL Repair Pipe, catalytic converter 889-165
Item No.:
889-165_BOSAL
Manufacturer:
BOSAL
Part Number:
889-165
EAN-No.:
3351648891657

articlenumber: 889-165
oemnumbers: 889-165
MSRP 56.82 EUR 32.40 EUR

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Item No.:
099-086_BOSAL
Manufacturer:
BOSAL
Part Number:
099-086
EAN-No.:
3351640990860

oenumbers: 18301432152
producttype: Catalytic Converter
Einbauposition: vorne
Supplementary Article/Supplementary Info: with add-on material
articlenumber: 099-086
manufacturer: BOSAL
oemnumbers: 099-086
287.07 EUR

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Item No.:
099-039_BOSAL
Manufacturer:
BOSAL
Part Number:
099-039
EAN-No.:
3351640990396

producttype: Catalytic Converter
oenumbers: 4A0131702J
Supplementary Article/Supplementary Info: with add-on material
oemnumbers: 099-039
Einbauposition: mitte
manufacturer: BOSAL
articlenumber: 099-039
273.09 EUR

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Item No.:
099-838_BOSAL
Manufacturer:
BOSAL
Part Number:
099-838
EAN-No.:
3351640998385

producttype: Catalytic Converter
oenumbers: 8200160015
Einbauposition: vorne
articlenumber: 099-838
oemnumbers: 099-838
Supplementary Article/Supplementary Info: with add-on material
manufacturer: BOSAL
151.83 EUR

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Item No.:
090-618_BOSAL
Manufacturer:
BOSAL
Part Number:
090-618
EAN-No.:
3351640906182

producttype: Catalytic Converter
Einbauposition: vorne
Supplementary Article/Supplementary Info: with add-on material
oemnumbers: 090-618
articlenumber: 090-618
manufacturer: BOSAL
oenumbers: 1706F6
355.56 EUR

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Item No.:
090-429_BOSAL
Manufacturer:
BOSAL
Part Number:
090-429
EAN-No.:
3351640904294

producttype: Catalytic Converter
Einbauposition: vorne
Supplementary Article/Supplementary Info: with add-on material
oemnumbers: 090-429
articlenumber: 090-429
manufacturer: BOSAL
oenumbers: 140028H700
381.49 EUR

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The catalytic converter is part of the exhaust system and is installed between the exhaust manifold and the middle silencer in most vehicles. If the catalytic converter is defective, it should be replaced soon, because if it does not work, the pollutant emission is much higher. By the way, driving without a catalytic converter is illegal, because anyone who removes it or keeps it inoperable is in principle committing tax evasion. The classification of the pollutant class (and thus the amount of vehicle tax) is based on the pollutant emissions of a properly functioning vehicle with catalytic converter. For a long time, there were no catalytic converters for diesel, but in the meantime, these vehicles have also usually been fitted with a special oxi-cat. A special feature of diesel vehicles is also the DPF (Diesel Particulate Filter). This filters out small soot particles from the exhaust gas stream, which are considered to be harmful to health when inhaled. They also increase the fine dust pollution in city centres. Soot particle filters naturally cost money, which is why they were not offered at all in many older diesel vehicles for a long time. Nevertheless, there are now solutions for retrofitting a soot particle filter. There are corresponding retrofit kits for many vehicle models, as well as spare parts or replacement parts for catalytic converters.

How does the catalyst work? .

The catalyst structure in detail

A typical catalyst consists of these components:

  • substrate (ceramic or metallic carrier layer)
  • precious metals on the catalytic surface (e.g. platinum, rhodium, palladium)
  • Catalyst shell for low-vibration mounting

Special features of the catalyst for diesel

In diesel vehicles, no 3-way catalytic converter is used, but usually a so-called oxidation catalyst. This is due to the fact that diesel exhaust gases contain a relatively large amount of oxygen. It is used for oxidation to convert carbon monoxide into carbon dioxide. It also converts hydrocarbons into carbon dioxide and water vapour. Today, oxi-catalysts in diesel vehicles are optimally combined with DPF particulate filters.

indications of problems with the catalyst

Of course, the catalyst as a component can also have defects. During normal operation, these cannot always be detected by the driver and are often only noticed during the next exhaust emission test as part of the TÜV inspection. But there are also signs which the driver can notice, depending on the defect present.

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You should be aware of this:

  • rattling noises from the height of the catalytic converter while driving
  • Idle speed problems
  • higher fuel consumption
  • Problems with temperature control (especially in turbo vehicles)
  • loss of performance
  • changes in the sound of the exhaust system (usually it gets louder)

Causes of catalyst defects

In addition to the wear of the carrier material already mentioned, the catalyst may also be reduced in its effectiveness for other reasons or lose it completely. Common causes of catalyst defects are as follows:

  • wear of the carrier layer
  • damage by leaded petrol
  • breakage and crumbling of the honeycomb structure due to shocks and vibrations
  • crumbled catalysts often reduce exhaust gas flow (thereby loss of power)
  • corrosion on the outer housing
  • Leaks in the exhaust manifold or exhaust parts in front of the catalytic converter
  • defective lambda sensors
  • problems with the control unit
  • for turbocharged vehicles: possibly incorrect tuning (especially after tuning)
  • Petrol which enters the catalytic converter unburned and burns off there (this can damage the carrier layer) ? happens mainly during push-starting or towing

If there are leaks in front of the catalytic converter, the system can draw in false air. Due to the excessive proportion of oxygen in the exhaust gas, the lambda sensor reports incorrect values to the control unit, which results in the mixture being processed completely incorrectly. As a result, there can be a complete loss of performance.

Can you repair a catalyst defect?

If a catalyst is defective, it usually has to be replaced completely. In most cases a repair would be disproportionately expensive, because replacing the carrier material or the storage mat is hardly practicable. In addition, the housing of the catalytic converter would have to be opened, which is not provided for. This opening could also release harmful fibers of the bearing mat or the smallest components of the support structure. Therefore you will usually have to replace the catalytic converter with a suitable spare part. Whether this work can be carried out by yourself depends on the respective vehicle model. Sometimes it is possible to easily separate a catalytic converter from the exhaust system. Often, corrosion and high temperatures make it difficult or impossible to open the connecting screws. Welding and later re-welding of the exhaust system is often the only alternative if the entire exhaust system is not to be replaced completely. Replacing a complete part or bolted elements is possible with some manual skill for laymen, if they have the necessary tools. Without a lifting platform, however, replacement is hardly possible. You can obtain inexpensive replacement catalytic converters as well as soot particle filters for diesel vehicles from us for all current vehicle models. Installation is often not very expensive, even in a specialist workshop, because the time required is limited. So you can save money especially by buying cheap spare parts, which you can get from us in original equipment quality. Old catalytic converters must be disposed of professionally. The precious metals contained can be recycled and are valuable components in the production of new catalytic converters.