Exhaust System: Description and Operation

Exhaust System, Emission Control

General

The exhaust systems in all new Cayenne models have been redesigned for direct fuel injection (DFI) in order to achieve maximum performance with minimum emissions.

All exhaust systems include the following:
- Two pre-catalytic converters.
- Two main catalytic converters.
- Two oxygen sensors (LSU) in front of the catalytic converters.
- Two oxygen sensors (LSF) behind the catalytic converters.
- Exhaust standard EU4 and LEV2 (USA emission standards).

Cayenne V6 Exhaust System







The exhaust system has two pre-catalytic converters and new in the V6 engine, two main catalytic converters as well as a crossover pipe between the two exhaust tracts. The pre-catalytic converters installed in USA vehicles are different to those used in RoW vehicles.

The exhaust quality is monitored by two oxygen sensors (LSU) in front of the pre-catalytic converters and two oxygen sensors (LSF) behind the pre-catalytic converters. In addition, the V6 exhaust system as far as the rear muffler has been designed as a dual flow system. This improves the gas cycle by reducing the exhaust back pressure and ensuring better matching of the gas oscillations in the exhaust system. Behind the two main catalytic converters, there is a crossover pipe in the front muffler that connects the exhaust tracts. As a result, the torque curve is positively influenced at the lower end of the rpm range by an improved gas cycle.