Typical design of the exhaust system (on the example of models with an engine of the M119 series)
G3 / 4 - Right pre-catalytic lambda probe; G3 / 4x1 - Contact connector for the wiring of the right pre-catalytic lambda probe; G3 / 3 - Left pre-catalytic lambda probe; G3 / 3x1 - Contact connector for the wiring of the left pre-catalytic lambda probe; 18 - Hanger