S 430 4MATIC (220.183) V8-4.3L (113.948) (2003)
Position on engine 137
G3/8
O2 sensor on left upstream of TWC Cylinders 10 - 12
Position on engine 137
G3/9
O2 sensor on right upstream of TWC Cylinders 1 - 3
Position on engine 137
G3/10
O2 sensor on right upstream of TWC Cylinders 4 - 6