Removing the engine wiring harness for sensor system 2

WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Working on 12 V electrical system .
Risk of short circuits! Risk of fire!

Make sure that there is no charger connected to the jump start terminal in the engine compartment.
Detach battery ground lead from battery.
For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.

NOTE: RISK OF DAMAGE
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS) .
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults .

Detach battery terminal from battery pole by carefully shifting to and fro. Do not pry off using a tool.

NOTE: TECHNICAL INFORMATION
When the engine is stopped after the completion of trip, it may be necessary to run the electric fan. In rare cases, operation of the electric fan can last up to 11 min. This protects the components. In this case, replacing the electric fan will not remedy the problem!

Preliminary work

Refer to REMOVING THE SEAL FOR THE HOOD REAR .
Refer to REMOVING THE COVER OF THE ENGINE COMPARTMENT AT THE REAR LEFT .
Refer to REMOVING THE COVER OF THE REAR RIGHT ENGINE COMPARTMENT .
Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
Refer to REMOVING LEFT AND RIGHT WIPER ARM .
Refer to REMOVING WINDSHIELD PANEL COVER .
Refer to REMOVING TRAILING LINK AT SPRING BOLT .
Refer to REMOVING THE CENTER COWL UPPER PART .
Refer to REMOVING THE CENTER BULKHEAD LOWER PART .
Refer to REMOVING THE FRONT SPOILER .
Refer to REMOVING THE FRONT UNDERBODY PROTECTION .
Refer to REMOVING THE LEFT AND RIGHT FRONT UNDERSHIELD .
Refer to REMOVING THRUST FIELD .
Refer to REMOVING THE RIGHT HAND FRONT BOTTOM SIDE COVER .
Refer to REMOVING SUSPENSION STRUT BRACE .
Refer to REMOVING THE ACOUSTIC COVER .
Refer to REMOVING THE COVER FOR THE DME CONTROL UNIT .
Refer to REMOVING THE FRONT-END STRUT .
Refer to REMOVING THE CLEAN AIR PIPE FOR CYLINDERS 1 TO 3 .
Refer to REMOVING SEAL FOR FRONT HOOD .
Refer to REMOVING THE COVER FOR THE CENTER ENGINE COMPARTMENT .
Refer to REMOVING UPPER CROSS CONNECTION .
Refer to REMOVING THE REAR TOP CROSS CONNECTION .
Refer to REMOVING THE RIGHT INTAKE FILTER HOUSING (FRONT-END STRUT REMOVED) .
Refer to DRAINING THE COOLANT FOR THE HIGH-TEMPERATURE COOLANT CIRCUIT .
Refer to REMOVING THE FAN COWL .
Refer to REMOVING THE CHARGE AIR DUCT FOR CYLINDERS 1-3 .

Engine wiring harness for sensor system 2

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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: 61 35... NOTES ON ESD (ELECTROSTATIC DISCHARGE) PROTECTION .

NOTE: RISK OF DAMAGE
Damage to wires when disconnecting connectors and plug connections .
Sheared wires can cause a short circuit .

Do not pull on wires when disconnecting connectors and plug connections.

NOTE: TECHNICAL INFORMATION
Follow instructions for removing and installing control units.
For additional information see: 12 00... NOTES ON REMOVAL AND INSTALLATION OF CONTROL UNITS .

NOTE: TECHNICAL INFORMATION
If control units are disconnected, fault memory entries and functional limitations may occur.
The fault memory entries must be read out and, if necessary, deleted.

Unlock and disconnect the plug connection (1) of the control valve (2) for the piston cooling.
Unlock and disconnect the plug connection (3) of the oxygen sensor monitor.

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Unlock plug connections (1) and disconnect.

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Unlock plug connections (1) and disconnect.

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Unlock plug connections (1) and disconnect.

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Unlock the locks (1).
Feed out all the connectors (2) in arrow direction and set it aside.

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Unlock the lock (arrow).
Disconnect the cable holder (1) upwards from the control unit holder (2).

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Unlock the locks (arrows).
Feed out the engine wiring harness (1) for the sensor system 2 and set it aside.

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Unlock plug connection (1) and disconnect.
Loosen the clamp (arrow).

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Unlock plug connection (1) and disconnect.
Release the clamps (arrows).

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Unlock and disconnect plug connections (1).
Release the clamps (arrows).
Feed out the engine wiring harness (2) for the sensor system 2 and set it aside.

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Loosen screws (1).

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Feed out the plug connection (1) from the holder (2) in arrow direction and set it aside.

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Unlock plug connection (1) and disconnect.

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Unlock the lock (1).
Remove the wiring harness section (2) and put to one side.

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Unlock the locks (arrows).
Remove the wiring harness section (1) and put to one side.

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Detach holder (1) from the ball pivot (2).

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Lay holder (1) to one side.

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Unlock and disconnect the plug connections (1) and (2).
Loosen the clamp (arrow).

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Unlock and disconnect plug connections (1).
Release the clamps (arrows).

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Feed out the connector (1) and (2) in arrow direction from the carrier plate (3) and set it aside.
Unlock plug connection (1) and disconnect.

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Unlock plug connections (1) and disconnect.
Unlock the locks (arrows).
Feed out the engine wiring harness (2) for the sensor system 2 and set it aside.

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Unlock plug connection (1) and disconnect.
Loosen nut (2).
Pull out and remove the retainer (3).
Feed out auxiliary coolant pump (4) and set aside.

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Unlock plug connections (1) and disconnect.
Loosen the clamp (arrow).

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Release the coolant ventilation line (1) and the tank vent line (2) from the holders (arrows) and set it aside.

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Unlock and disconnect the plug connections (1) and (2).
Loosen screw (3).
Unlock the locks (4).
Feed out the engine wiring harness (5) for the sensor system 2 and set it aside.

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Feed out and remove the engine wiring harness (1) for the sensor system 2.

Courtesy of BMW OF NORTH AMERICA, INC.