Removing the knock sensor of cylinders 4 to 6

NOTE: TECHNICAL INFORMATION
Additional coolant can leakage. Make sure that no coolant enters the Intake port of the cylinder head.

NOTE: TECHNICAL INFORMATION
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.

Preliminary work

Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
Refer to BRINGING FRONT COMPARTMENT LID IN THE SERVICE POSITION .
Refer to REMOVING THE ACOUSTIC COVER .
Refer to REMOVING THE SEAL FOR THE HOOD REAR .
Refer to REMOVING ACOUSTIC COVER AT REAR (540i 2017-2020) , or REMOVING ACOUSTIC COVER AT REAR (540i xDrive 2017-2020) .
Refer to REMOVING THE DME CONTROL UNIT .
Refer to REMOVING THE INTEGRATED POWER SUPPLY MODULE (PDM) .
Refer to REMOVING CONTROL UNIT BRACKET (540i 2017-2020) , or REMOVING CONTROL UNIT BRACKET (540i xDrive 2017-2020) .
Refer to REMOVING THE COVER ON LEFT AND RIGHT IN THE ENGINE COMPARTMENT AT THE TOP .
Refer to REMOVING BOTH FRONT-END STRUTS .
Refer to REMOVING FRONT CROSS CONNECTION .
Refer to REMOVING THE REAR TOP CROSS CONNECTION .
Refer to REMOVING THE FAN COWL .
Refer to REMOVING THE FRONT UNDERBODY PROTECTION OR FRONT THRUST FIELD .
Refer to REMOVING THE UNDERBODY PROTECTION OF THE STEERING GEAR AND THRUST FIELD RESPECTIVELY .
Refer to DRAINING THE COOLANT FROM THE LOW-TEMPERATURE COOLING SYSTEM (540i 2017-2020) , or DRAINING THE COOLANT FROM THE LOW-TEMPERATURE COOLING SYSTEM (540i xDrive 2017-2020) .
Refer to CONNECTING THE COOLANT LINES FOR THE LOW-TEMPERATURE COOLANT CIRCUIT (540i 2017-2020) , or CONNECTING THE COOLANT LINES FOR THE LOW-TEMPERATURE COOLANT CIRCUIT (540i xDrive 2017-2020) .
Refer to REMOVING TANK VENT VALVE (540i 2017-2020) , or REMOVE TANK VENT VALVE (540i xDrive 2017-2020) .
Refer to REMOVING THE INTAKE PLENUM (540i 2017-2020) , or REMOVING THE INTAKE PLENUM (540i xDrive 2017-2020) .

NOTE: RISK OF DAMAGE
Electrostatic discharge.
Damage to or destruction of electrical components.

Leave the electrical components in their original packaging until they are being installed. Only use the original packaging for returning the product. Always package removed components straight away.
Read and comply with user information on using the associated special tool 12 7 060.
Only tap the housings of electrical components. Do not tap pins or multi-pin connectors directly.
Wear electrically conductive clothing and antistatic shoes (with ESD symbol).
For additional information see: NOTES ON ESD (ELECTROSTATIC DISCHARGE) PROTECTION .

Unlock plug connection (1) and disconnect.
Loosen screw (2).
Remove the knock sensor (3).