System overview

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The following graphic shows the system overview of the knock control with the engine N55:

Fig 1: Knock Control With Engine N55 - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

Index	Explanation
1	Digital engine electronics (DME)
2	Knock sensor (cylinders 1 through 3)
3	Knock sensor (cylinders 4 through 6)