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A catalytic converter ensures clean exhaust air


A functioning catalytic converter is required by law in every vehicle due to the ever stricter European emission standards. Its function is to treat the exhaust gases and reduce emissions. Each general inspection therefore checks whether the catalytic converter still runs perfectly in the car.

In order to guarantee functionality, it is important to use high-quality automotive catalytic converters and to ensure that they fit perfectly. This is the only way to sustainably reduce exhaust gases. Practically the same high quality as the original parts are offered by the identical catalytic converters of well-known spare parts manufacturers such as IMASAF, HJS, Twintec etc., which you will also find in our assortment. In the lower part of the page we will go into more detail about the function of catalytic converters in cars and show how they can break.

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KATALYSATOR für SEAT AROSA (6H) VW LUPO POLO (6N2) 1.0 ALD + 1.4 AKK AUD AKP

inkl. MONTAGEMATERIAL | VAG-Nr: 6X0253058DX

item ref.: UNI813W026
manufacturer: BM CATALYSTS
part number: BM90821H
EAN-Nr.: 5052746044126
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
95.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

KATALYSATOR KRÜMMERKAT SEAT Ibiza 3 SKODA Fabia 1 VW Polo (9N) 1.2 64 PS AZQ

inkl. MONTAGEMATERIAL | VAG-Nr: 03E25320FX

item ref.: UNI813W013
manufacturer: BM CATALYSTS
part number: BM91211H
EAN-Nr.: 5052746050165
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
106.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

KATALYSATOR KRÜMMERKAT für OPEL AGILA A + CORSA C + CORSA D 1.0 58 / 60 / 65 PS

inkl. MONTAGEMATERIAL | OPEL-Nr: 13106542

item ref.: UNI813W020
manufacturer: BM CATALYSTS
part number: BM91018H
EAN-Nr.: 5052746047141
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
141.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

KATALYSATOR für BMW 5er E39 LIMO + TOURING 520i 150 PS + 523i 170 PS bis 09.1998

inkl. MONTAGEMATERIAL | BMW-Nr: 18301427027

item ref.: UNI813W019
manufacturer: BM CATALYSTS
part number: BM90233H
EAN-Nr.: 5052746035742
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
120.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

KATALYSATOR KRÜMMERKAT KAT für FORD FOCUS C-MAX / C-MAX (DM2) FOCUS II 1.4 1.6

inkl. MONTAGEMATERIAL | FORD-NR. 1 855 297

item ref.: A06813W951
manufacturer: BM CATALYSTS
part number: BM91275H
EAN-Nr.: 5052746051209
Nur_In_Verbindung_Mit: FK91275
Pruefzeichen: E9-103R
Mengeneinheit: Stück
Baugruppe: Abgasanlage
170.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

KATALYSATOR SKODA Fabia I bis 10.2005 + VW Polo 9N 1.2 54 PS AWY bis 04.2004

inkl. MONTAGEMATERIAL | VAG-Nr: 03D253052X

item ref.: UNI813W017
manufacturer: BM CATALYSTS
part number: BM91302H
EAN-Nr.: 5052746051667
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
117.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

BM CATALYSTS Katalysator Krümmerkat HYUNDAI i20 PB 1.2 KIA Rio 3 UB 1.25 bis Euro 5 vorne

KIA: 2851003980 | HYUNDAI: 2851003210 | Bj beachten | inkl. Montagematerial

item ref.: UNI813W099
manufacturer: BM CATALYSTS
part number: BM92005H
EAN-Nr.: 5052746174533
Nur_In_Verbindung_Mit: FK92005
Pruefzeichen: E9-103R
Mengeneinheit: Stück
Baugruppe: Abgasanlage
199.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

BM CATALYSTS KATALYSATOR + ENDSCHALLDÄMPFER SMART CITY-COUPE FORTWO 450 0.6 0.7

inkl. MONTAGEMATERIAL | SMART-Nr: 0011953V001

item ref.: UNI813W032
manufacturer: BM CATALYSTS
part number: BM91364H
EAN-Nr.: 5052746052602
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
121.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

KATALYSATOR AUDI A3 8L SEAT Leon SKODA Octavia VW Bora Golf 4 1.6 100-102 PS

inkl. MONTAGEMATERIAL | VAG-Nr: 1J0253058DX

item ref.: UNI813W025
manufacturer: BM CATALYSTS
part number: BM90529H
EAN-Nr.: 5052746039870
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
99.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

KATALYSATOR MINI R56 R55 R57 One Cooper CITROEN C4 I PEUGEOT 207 308 1.4/1.6 16V

inkl. MONTAGEMATERIAL | MINI: 18407563247, PSA: 0341.L3

item ref.: UNI813W022
manufacturer: BM CATALYSTS
part number: BM91480H
EAN-Nr.: 5052746079104
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
141.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

KATALYSATOR + HOSENROHR für AUDI A4 (8D B5) + VW PASSAT (3B2 3B5) 1.8 125 PS

inkl. MONTAGEMATERIAL | VAG-Nr: 8E0253095HX

item ref.: UNI813W028
manufacturer: BM CATALYSTS
part number: BM90626H
EAN-Nr.: 5052746078886
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
86.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

BM CATALYSTS KATALYSATOR KRÜMMERKAT CITROEN C1 PEUGEOT 107 TOYOTA Aygo 1.0 68 PS

inkl. MONTAGEMATERIAL | PEUGEOT-Nr: 0342.K8

item ref.: UNI813W031
manufacturer: BM CATALYSTS
part number: BM91263H
EAN-Nr.: 5052746051025
64374267: mit Anbaumaterial
Pruefzeichen: E9-103R
Baugruppe: Abgasanlage
Mengeneinheit: Satz
125.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart
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How does a catalyst work in a car?


The combustion of fuel with the aid of atmospheric oxygen produces water and Co² in the engine. Since the combustion does not take place completely, however, further combustion products are produced, which we call exhaust gas. The exhaust air of petrol engines mainly contains pollutants such as:

  • carbon monoxide (CO)
  • hydrocarbon(HC)
  • nitric oxide (NOX)

In diesel engines, on the other hand, sulphur dioxide (SO²) and soot particles (PM) are added. The vehicle catalytic converter now cleans the exhaust gases and filters the pollutants or helps to convert them into harmless gases such as water, nitrogen and CO². Since a car catalytic converter in petrol vehicles can render 3 pollutants harmless, it is also called a three-way catalytic converter.

In diesel vehicles, an oxidation catalytic converter is predominantly used and at least one soot particle filter is added. This converts carbon monoxide and hydrocarbons into harmless gases. Modern diesel engines also have a nitrogen oxide storage catalytic converter. This means that the third pollutant can also be effectively reduced.

In order for the vehicle catalytic converter to unfold its full effect, it requires a specific exhaust gas composition and an engine temperature of at least 500° Celsius. In order to achieve the required mixture, the lambda sensor placed between the engine and the vehicle catalytic converter measures the residual oxygen content in the exhaust gas. The engine control system processes the measurement result and provides the control impulses for perfect mixture formation.

How can catalytic converters be defective?


Like many other vehicle components, the catalytic converter in a car is subject to a natural ageing process. Constantly high temperatures of over 500°C and the mechanical loads caused by vibration contribute to the loss of the precious metal-containing coating (platinum, rhodium or palladium) of the carrier over time. Likewise, additives can deposit in the catalytic converter and clog it if the engine burns too much oil. The exhaust gases then no longer reach the precious metals and the catalytic converter loses its function, which leads to a fault in the board computer.

This error also occurs when a vehicle is used exclusively for short distances. Since the engine takes 3-5 minutes to reach operating temperature, the vehicle catalytic converter can only then work effectively. In shorter journeys, pollutant residues remain in the catalytic converter and lead to clogging in the long run. The same happens if you fill up with leaded fuel instead of unleaded petrol. Therefore you should always pay attention to the right fuel when refuelling, especially abroad.

In the event of a blockage, the catalyst in the car can be regenerated again by driving on the motorway for a longer period of time; this is also referred to as "free-running". Of course, an error in the ignition or mixture preparation system can also lead to an unburned fuel-air mixture getting into the catalytic converter and burning inside. Therefore, malfunctions in the ignition or mixture preparation should be rectified immediately in a specialist workshop.

High-quality catalysts in cars are not only important to protect the environment, but also to pass the TÜV test. Therefore, high quality should always be a priority here. But it does not always have to be the original part. Many leading spare part manufacturers offer identical catalytic converters that fully meet the requirements of the original parts. Branded identical parts represent a good price alternative without having to compromise on quality. We will be happy to advise you on the choice of the right catalyst for your vehicle.

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