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 MANUALSBMW2004325CI CONVERTIBLE (E46) L6-2.5L (M54)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMKNOCK SENSORSERVICE AND REPAIR
2004 BMW 325Ci Convertible (E46) L6-2.5L (M54)
Knock Sensor: Service and Repair
2004 BMW 325Ci Convertible (E46) L6-2.5L (M54)SECTION Service and Repair
Replacing Knock Sensor(s) (S54)
Interrogate fault memory of DME control unit. Switch off ignition.
Remove intake air manifold.
Release nuts and place idle-speed control valve (1) to one side.
Unlock plug and detach from knock sensor.
Release knock sensor screw connection on engine block.
Remove knock sensor.
Installation:
Torque: 20Nm
Clean contact surface of knock sensors on engine block.
NOTE:
Interrogate fault memory of DME control module.
Check stored fault messages.
Rectify faults.
Then clear fault memory.
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.