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Home >> BMW >> 2021 >> 840i 2D Convertible >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Engine Electrical System -- Repair (G14, G15, & G16) >> 12 51 Engine Wiring Harness >> 12 51 302 Remove and install/replace wiring harness section, sensor system module cylinder 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan) >> Removing the wiring harness for the sensor system of cylinder bank 1

Removing the wiring harness for the sensor system of cylinder bank 1

WARNING: Hot surfaces. 
Risk of burning! 
  • Perform all work only on components that have cooled down.
WARNING: Hot fluids. 
Risk of scalding! 
  • Conduct all work in the vehicle wearing appropriate personal protective equipment only.
WARNING: Hot exhaust system. 
Risk of burning! 
  • Any work must exclusively be carried out with an exhaust system that has cooled down.
WARNING: Car may slip off the vehicle hoist where components are supported. 
Danger! Immobilization period-threatening injuries! 
  • Secure the vehicle hoist against lowering and lifting.
  • Make sure that the vehicle does not lift off the mounting plates on the vehicle lift.
WARNING: Vehicle may slip off the vehicle hoist if the vehicle hoist is handled incorrectly. 
Danger! Immobilization period-threatening injuries! 
WARNING: Car may slip off the vehicle hoist if the weight is distributed unevenly. 
Danger! Immobilization period-threatening injuries! 
  • Ensure there is a specific weight compensation on the car.

Preliminary work 

Overview graphic for the wiring harness for the sensor system of cylinder bank 1 

G15125781Courtesy of BMW OF NORTH AMERICA, INC.
G15115990Courtesy of BMW OF NORTH AMERICA, INC.