Repair manual

SULEV 2.0L TFSI Engine
33
Catalytic Converter System
The exhaust system was developed with the following
goals in mind:
– Easy compliance with SULEV exhaust emission limits
– High long-term stability over 150,000 miles (240,000
km) and 15 years
– Minimized increase in exhaust back-pressure in
catalytic converters with a high cell density
– Reduced light-off time
The primary catalytic converter is designed to comply
with statutory emission limits. To achieve this, cell density
has been increased and wall thickness reduced.
To minimize light-off time of the primary catalytic
converter, it is close coupled to the exhaust turbocharger
turbine (directly in the integral module).
Overview of the Components
Integral
Module
Heated Oxygen Sensor G39 Upstream of
Primary Catalytic Converter (broadband
oxygen sensor in the integral module)
Ceramic Underbody
Catalytic Converter
Exhaust
Decoupling
Element
Close-Coupled
Ceramic Primary
Catalytic Converter
Oxygen Sensor G130 Upstream of Catalytic
Converter (nonlinear lambda sensor
upstream of underbody catalytic converter)
Oxygen Sensor G287 Downstream of
Catalytic Converter (nonlinear lambda sensor
downstream of underbody catalytic converter)