S 500 4MATIC (220.184) V8-5.0L (113.966) (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