Exhaust System, Design

Exhaust System, Design




156 Longitudinal compensation element
157 Firewall three way catalytic converter
158 Underfloor three way catalytic converter
G3/7 Left O2 sensor upstream TWC Cylinder 7 - 9
G3/8 Left 02 sensor upstream TWC Cylinder 10 - 12
G3/9 Right 02 sensor, upstream TWC Cylinder 1 - 3
G3/10 Right 02 sensor upstream TWC Cylinder 4 - 6
G3/11 Left 02 sensor downstream TWC Cylinder 7 - 9
G3/12 Left 02 sensor downstream TWC Cylinder 10 - 12
G3/13 Right 02 sensor downstream TWC Cylinder 1 - 3
G3/14 Right 02 sensor downstream TWC Cylinder 4 - 6
a cross connection

A total of 8 O2 sensors are installed upstream and downstream of the firewall catalytic converters (157). The longitudinal compensation element (156) is required because of the cylinder shutoff, if the left and right exhaust stream is at different temperatures.

The cross connection (a) prevents the left underfloor three way catalytic converter from cooling down when the cylinder shutoff is ON.