Nowadays it is increasingly becoming necessary to reduce the exhaust emissions coming out of a car's engine. With this motive the Audi catalytic converter tries to convert the exhaust unburnt gases from the engine to more completely burned gases so as to reduce the emissions coming out of the exhaust tail pipe. The reduction catalyst present inside the converter absorbs the oxides of nitrogen and frees the oxygen molecule to form nitrogen gas and oxygen, also the other catalyst known as oxidation catalyst helps in converting carbon monoxide to carbon dioxide which is comparatively a less harmful gas.
This conversion also helps the oxygen sensor to suggest a more appropriate air fuel ratio in order to reduce the amount of oxygen levels. Audi catalytic converter is thus exposed to great temperatures of the exhaust and needs to be replaced with time. An oxygen sensor which senses more oxygen in the exhaust than the limiting value is one of the symptom of a damaged catalytic converter and also due to some external leakage in the converter an unpleasant sound will be heard at the exhaust tail pipe. If you are worried about the costly OEM replacement than better opt for catalytic converters from Walker, Eastern and Bosal brands at very low rates with same good quality. Less[-]