Catalytic Converter — General Description and Precautions (Audi 100 C3)

1. The catalytic converter is a reliable and simple device that does not require any maintenance in itself, but there are some recommendations that the owner must know and follow in order for the converter to function properly throughout its entire service life.

• a) In some cases, a hydrogen sulfide smell may be felt from the exhaust system (the smell of rotten eggs). This is typical for many cars equipped with a catalytic converter. After a few thousand kilometers, the problem should disappear. Low-quality fuel with a high sulfur content can increase this effect.
• b) A catalytic converter on a well maintained and regularly serviced vehicle can last for 80,000-160,000 km - if the converter is no longer effective, replace it.
• c) Do not use fuel or oil additives - they may contain substances harmful to the catalytic converter.
• d) Do not operate the vehicle if the engine burns oil to the point of producing visible blue smoke.
• e) Remember that the catalytic converter operates at very high temperatures. DO NOT park the vehicle on dry long grass or piles of leaves.
• f) Remember that the catalytic converter is extremely fragile - do not hit it with tools during servicing work.

(The original text of the material can be found on the website «AUDImanual»)