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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 51 300 Remove and install/replace engine wiring harness section, ignition module cylinder 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan) >> Removing wiring harness section for the ignition system of cylinder bank 1

Removing wiring harness section for the ignition system of cylinder bank 1

Preliminary work 

Wiring harness section for the ignition system of cylinder bank 1 

G14262053Courtesy of BMW OF NORTH AMERICA, INC.

Removing ignition coil of cylinder bank 1 

Precondition 

Ignition is switched off.

NOTE: RISK OF DAMAGE 
Damage to the ignition coil. 
The silicone hose of the ignition coil must not be contaminated by fuel as this can lead to failure of the ignition coil. 
  • When working on the fuel system, cover the ignition coils with suitable materials and remove where required.
  • Do not oil or grease the silicone tube of the spark plug socket. Do not  use any protection or maintenance products (e.g. silicone spray rubber care products, rust remover, etc.).
G14262057Courtesy of BMW OF NORTH AMERICA, INC.
G14262058Courtesy of BMW OF NORTH AMERICA, INC.