Catalytic converterGermany
An introduction to the traffic rules and road signs of Germany. Learn about driving, road safety and much more in our illustrated book, with answers to frequently asked questions.
For informational purposes only. Always follow official regulations. Some content and images were created with AI assistance.
264. Catalytic converter
A catalytic converter is an emissions-control device fitted in a vehicle's exhaust system. It uses chemical reactions to convert harmful exhaust pollutants into less harmful substances before the exhaust gases are released into the atmosphere.
Depending on the engine and system, a catalytic converter can reduce pollutants such as carbon monoxide, unburned hydrocarbons and nitrogen oxides. It must reach an appropriate operating temperature to work effectively and can be damaged by contamination, overheating or engine faults.
Wikimedia.org • Oak Ridge National Laboratory • CC BY
What does a catalytic converter do?
A catalytic converter reduces harmful pollutants in engine exhaust by converting them through chemical reactions into less harmful substances before they leave the exhaust system.
🔗 hella.com • HELLA, exhaust system components and design
🔗 hella.com • HELLA, exhaust gas aftertreatment, catalytic converters and particulate filters
What are signs of a faulty catalytic converter?
An emissions or engine warning, or an unsatisfactory emissions test, can lead to checks of the catalytic converter along with the engine-management system and sensors. These signs do not prove that the converter itself is faulty; proper diagnosis is needed.
🔗 hella.com • HELLA, exhaust system components and design
🔗 hella.com • HELLA, exhaust gas aftertreatment, catalytic converters and particulate filters

Traffic rules
Germany