Engine Mechanical:
N55B30 Twin-scroll Turbocharged Inline-6 Engine: Engine assembly, cylinder head, crankshaft, pistons, connecting rods, lubrication system, cooling system.
Engine Management:
Engine control unit (DME), ignition system, fuel injection system, emissions control systems (catalytic converter, secondary air injection), turbocharger system, VANOS (Variable Valve Timing).
Transmission:
8-Speed Automatic Transmission (e.g., ZF 8HP series): Hydraulic control, mechatronics, torque converter, transmission fluid, valve body, shift solenoids.
Drivetrain:
Rear-wheel drive (RWD) or xDrive (All-wheel drive): Driveshaft, differential, axles, CV joints.
Suspension:
Front: MacPherson strut, aluminum control arms. Rear: Multi-link suspension. Shock absorbers, springs, anti-roll bars, bushings, steering knuckle.
Brakes:
Front and Rear: Ventilated disc brakes, ABS (Anti-lock Braking System), DSC (Dynamic Stability Control), brake pads, rotors, calipers, brake fluid, hydraulic lines, parking brake.
Steering:
Electric Power Steering (EPS): Steering column, steering rack, power steering pump (electric motor), steering assist calibration.
Electrical System:
12V Battery, alternator, starter motor, wiring diagrams, fuses, relays, lighting systems (headlights, taillights, interior), sensors, actuators.
Body And Chassis:
Body panels, doors, hood, trunk, bumpers, chassis components, corrosion protection, body sealing.
HVAC:
Automatic climate control, AC compressor, refrigerant, evaporator, condenser, blower motor, control panel, cabin air filter.
Infotainment And Electronics:
iDrive system, navigation, audio system, Bluetooth, USB interface, instrument cluster, control modules (e.g., FRM, JBE, DME, DSC).
Maintenance:
Oil change, filter replacement (oil, air, cabin), spark plug replacement, fluid level checks and top-offs, brake inspection, tire rotation.
Troubleshooting:
Diagnostic trouble code (DTC) interpretation, symptom-based troubleshooting guides, fault finding for engine, transmission, brakes, and electrical systems.
Repair:
Engine component replacement (e.g., turbocharger, fuel injectors), transmission service and repair, brake component replacement, suspension and steering component replacement, electrical component diagnosis and replacement.
Diagnostics:
ECU diagnostics, sensor testing, actuator testing, wiring harness continuity checks, using BMW ISTA/D or similar diagnostic tools.
Specifications:
Torque specifications for fasteners, fluid capacities, electrical specifications, diagnostic parameters.
Depth:
Comprehensive. Covers routine maintenance, troubleshooting, and detailed repair procedures for all major vehicle systems. Suitable for professional technicians and advanced DIY enthusiasts.
System Name:
iDrive (CCC or CIC depending on specific build date/options)
Display:
High-resolution central display screen (typically 7-inch or 10.2-inch).
Controllers:
iDrive Controller with integrated touchpad, voice control, steering wheel buttons.
Features:
Available: Parking Assistant, Lane Departure Warning, Blind Spot Detection, Head-Up Display (HUD), Adaptive Cruise Control (ACC).
Features:
Bluetooth connectivity for phone and audio streaming, USB interface, AUX input.
Headlights:
Standard Xenon headlights, optional Adaptive Xenon headlights.
Oil Change Interval:
Condition-based service (CBS) system, typically around 10,000-15,000 miles or 12-24 months, depending on driving conditions.
Brake Fluid Change:
Recommended every 2 years, regardless of mileage.
Air Filter Replacement:
Condition-based service (CBS), typically every 30,000-50,000 miles.
Cabin Filter Replacement:
Condition-based service (CBS), typically every 15,000-30,000 miles.
Spark Plug Replacement:
Recommended around 60,000-100,000 miles, depending on plug type and driving conditions. Consult manual for specific part numbers and torque specs.
Power Steering Fluid:
Electric Power Steering (EPS) system, does not use traditional hydraulic fluid for assistance.
Coolant:
BMW Blue Antifreeze/Coolant (G48)
Common Problems:
Water pump failures (electric), thermostat issues, ignition coil failures, oil leaks (valve cover gasket, oil pan gasket), turbocharger wastegate rattle, HPFP (High-Pressure Fuel Pump) issues in earlier N55 engines.
Potential Repairs:
Turbocharger replacement, VANOS solenoid replacement, fuel injector cleaning or replacement, catalytic converter issues.