Exhaust System: Description and Operation

Exhaust System / Emission Control V6 DFI

NOTE: Two exhaust manifolds Two wideband oxygen sensors (LSU ahead of catalytic converter) Two main catalytic converters (3-way catalytic converter, ceramic substrate) Two oxygen sensors LSF (behind catalytic converter) One center muffler One rear muffler Individual tailpipes on left and right.







Exhaust system

The exhaust system has two branches over a long distance. The exhaust gases are routed through two branches from the 2 exhaust manifolds via the 2 wideband oxygen sensors (LSU ahead of catalytic converter) to the 2 main catalytic converters. The gases then flow via the 2 LSF oxygen sensors to the center muffler and then through the rear muffler to the individual tailpipes on the left and right.







Emission control

The exhaust system of the V6 engine was adapted in order to achieve compliance with the strict worldwide emission standards. The previous system with primary main catalytic converters was changed to 2 close-coupled main catalytic converters. The close-coupled arrangement of the 2 main catalytic converters achieves heating up to the optimum operating temperature as well as a lower heat loss during start-stop phases.

The Cayenne V6 meets all globally valid emission standards without secondary-air injection: For USA - ULEV, for Europe - EURO 5.