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 MANUALSBMW2020840I XDRIVE 2D CONVERTIBLEREPAIR AND DIAGNOSISENGINE MECHANICALSTARTERENGINE ELECTRICAL SYSTEM -- REPAIR (G14, G15, & G16)
2020 BMW 840i xDrive 2D Convertible
Engine Electrical System -- Repair (G14, G15, & G16)
2020 BMW 840i xDrive 2D ConvertibleSECTION Engine Electrical System -- Repair (G14, G15, & G16)
- 12 00 General Information
- 12 12 Spark Plugs
- 12 13 Ignition Coils
- 12 13 511 Replacing an ignition coil (after vehicle diagnosis) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 13 506 Replacing an ignition coil (following vehicle diagnosis) (right) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 13 507 Replacing an ignition coil (after vehicle diagnosis) (left) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 13 512 Replacing more than one ignition coil (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 Engine Control Module, Sensors
- 12 14 521 Replacing the crankshaft sensor (after vehicle diagnosis) (840i coupe/convertible/Gran Coupe sedan)
- 12 14 523 Replace intake camshaft sensor (after vehicle diagnosis) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 524 Replace exhaust camshaft sensor (after vehicle diagnosis) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 550 Replacing the engine control module (after vehicle diagnosis) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 602 Replacing knock sensor (following vehicle diagnosis) (cylinders 1+3) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 604 Replacing knock sensor (following vehicle diagnosis) (cylinders 4+6) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 700 Coding the control unit (DME)
- 12 14 705 Programming the control unit (DME)
- 12 14 521 Replacing the crankshaft sensor (840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 512 Replace left exhaust camshaft sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 513 Replace right exhaust camshaft sensor (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 521 Replacing the crankshaft sensor (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 522 Replace left intake camshaft sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 526 Replace right intake camshaft sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 555 Replacing the engine control module for cyl. 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 556 Replacing the engine control module for cyl. 5-8 (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 610 Replacing knock sensor(s) right (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 14 611 Replace the left knock sensor(s) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 31 Alternator
- 12 31 020 Removing and installing/replacing alternator (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 31 020 Removing and installing/replacing alternator (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 32 501 Replacing the voltage regulator for the alternator (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 41 Starter Motor
- 12 41 020 Removing and installing/replacing starter motor (840i coupe/convertible/Gran Coupe sedan)
- 12 41 041 Replacing the engagement solenoid switch
- 12 41 020 Removing and installing/replacing starter motor (840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 41 020 Removing and installing/replacing starter motor (M850i xDrive coupe and Gran Coupe sedan)
- 12 41 020 Removing and installing/replacing starter motor (M850i xDrive convertible)
- 12 42 Starter Positive Battery Cable
- 12 42 540 Replacing the safety battery terminal (SBK)
- 12 42 651 Removing and installing/replacing the positive battery cable remote positive terminal alternator (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 42 652 Removing and installing/replacing the positive battery cable remote positive terminal starter (after vehicle diagnosis) (840i coupe/convertible/Gran Coupe sedan)
- 12 42 652 Removing and installing/replacing the positive battery cable remote positive terminal starter (after vehicle diagnosis) (840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 42 651 Removing and installing/replacing the positive battery cable remote positive terminal alternator (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 42 652 Removing and installing/replacing the positive battery cable remote positive terminal starter (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 Engine Wiring Harness
- 12 51 210 Replacing the wiring harness section for injectors and ignition coils (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 235 Remove and install/replace Module 1, sensor system engine wiring (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 240 Remove and install/replace Module 2, sensor system engine wiring (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 245 Remove and install/replace transmission module engine wiring (M850i xDrive Coupe, M850i Gran Coupe xDrive Sedan)
- Removing the wiring harness of the engine transmission module for equipment specification without a gasoline particulate filter
- Version with a gasoline particulate filter: Removing the engine wiring harness from the transmission module
- Equipment specification without gasoline particulate filter: Install the wiring harness for the engine transmission module
- Version with a gasoline particulate filter: Installing the engine wiring harness of the transmission module
- 12 51 250 Remove and install/replace blow-off valve wiring harness, cylinders 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 251 Remove and install/replace blow-off valve wiring harness, cylinders 5-8 (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 300 Remove and install/replace engine wiring harness section, ignition module cylinder 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 301 Remove and install/replace engine wiring harness section, ignition module cylinder 5-8 (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 302 Remove and install/replace wiring harness section, sensor system module cylinder 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 303 Remove and install/replace wiring harness section, sensor system module cylinder 5-8 (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 321 Removing and installing/replacing wiring harness section, adapter, oil-level sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 322 Removing and installing/replacing the engine control module / power distribution module wiring harness section (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 323 Remove and install/replace wiring harness section for oil temperature sensor adapter (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 51 245 Remove and install/replace transmission module engine wiring (M850i xDrive convertible)
- Removing the wiring harness of the engine transmission module for equipment specification without a gasoline particulate filter
- Version with a gasoline particulate filter: Removing the engine wiring harness from the transmission module
- Equipment specification without gasoline particulate filter: Install the wiring harness for the engine transmission module
- Version with a gasoline particulate filter: Installing the engine wiring harness of the transmission module
- 12 52 032 Removing and install right control unit bracket (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 52 033 Removing and installing/replacing the left control unit bracket (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 61 Oil Pressure Switch, Oil Level Sensor
- 12 61 280 Removing and installing/replacing oil pressure switch (840i coupe/convertible/Gran Coupe sedan)
- 12 61 280 Removing and installing/replacing oil pressure switch (840i xDrive coupe/convertible/Gran Coupe sedan)
- 12 61 280 Removing and installing/replacing oil pressure switch (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 61 285 Replacing engine oil level sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
- 12 63 Power Distribution Box
- 12 90 ECM Housing
RENDER: 1.0x
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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.