Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSBMW2011335XI 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEMENGINE PERFORMANCE - FUNCTIONAL DESCRIPTION -- E90ENGINE PERFORMANCE - FUNCTIONAL DESCRIPTIONKNOCK CONTROLSYSTEM OVERVIEW

2011 BMW 335xi 4D Sedan, Automatic

System overview

2011 BMW 335xi 4D Sedan, AutomaticSECTION System overview

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

Fig 1: Knock Control - 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)

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.