Market Position:
The 2004 BMW Coupe (part of the E46 generation) was positioned as a premium sporty coupe, competing with vehicles like the Mercedes-Benz CLK, Audi A4 Cabriolet (though primarily a coupe), and Lexus SC.
Competitive Analysis:
Known for its engaging driving dynamics, refined interior, and powerful inline-six engines, the E46 Coupe offered a blend of performance and luxury.
Key Features:
Excellent handling, powerful engine options, premium build quality, driver-focused cockpit.
Engine:
Detailed diagnosis, repair, rebuilding, performance tuning for all gasoline engine variants
Transmission:
Service and repair procedures for automatic and manual transmissions
Brakes:
ABS, DSC, brake system components, fluid changes, pad/rotor replacement
Electrical:
Wiring diagrams, component testing, module diagnosis, lighting, power accessories
Suspension:
Front and rear suspension, steering system, alignment specifications
Body:
Body panels, doors, windows, interior trim, convertible top mechanisms (if applicable)
Climate Control:
HVAC system diagnosis and repair, refrigerant service
Fuel System:
Fuel pump, injectors, fuel lines, evaporative emission control
Exhaust System:
Catalytic converter, mufflers, exhaust manifold, O2 sensors
Cooling System:
Radiator, water pump, thermostat, hoses, coolant specifications
Diagnostic Troubleshooting:
Extensive troubleshooting guides, symptom-based diagnostics, fault code explanations
Maintenance:
Scheduled maintenance, oil changes, filter replacements, inspections
Repair:
Step-by-step repair instructions for all major components and systems
Rebuilding:
Complete engine and transmission rebuilding procedures
Refurbishment:
Procedures for restoring worn or damaged components
Restoration:
Guidance for vintage restoration projects of the 2004 Coupe
Diagnostics:
Advanced diagnostic techniques and troubleshooting flowcharts
Wiring Diagrams:
Detailed electrical system wiring schematics
Torque Specifications:
Precise torque values for all fasteners
Special Tools:
Identification and usage of specialized BMW tools
Depth:
Comprehensive, covering basic maintenance to complete engine/transmission rebuilds
Engine Options:
3.0L Inline-6 Cylinder (N52 precursor, typically M54B30)
Engine Displacement:
2979 cc (for 3.0L models)
Horsepower:
Approximately 225 hp @ 5900 rpm (for 3.0L M54B30)
Torque:
Approximately 214 lb-ft @ 3500 rpm (for 3.0L M54B30)
Fuel Delivery:
Electronic Fuel Injection (EFI), Bosch Motronic ME 9.0 DME
Fuel Type:
Premium Unleaded Gasoline (91+ Octane)
Valve Train:
Double Overhead Camshafts (DOHC), 24 valves, VANOS (Variable Valve Timing)
Length:
Approx. 177.1 inches (4498 mm)
Width:
Approx. 68.5 inches (1740 mm)
Height:
Approx. 53.5 inches (1359 mm)
Curb Weight:
Approx. 3200 - 3400 lbs (depending on configuration)
Wheelbase:
Approx. 107.4 inches (2728 mm)
NHTSA Front Impact:
5-Star (for driver and front passenger in similar E46 models)
IIHS Side Impact:
Good (for comparable E46 models)
Active Safety Features:
Dynamic Stability Control (DSC), Anti-lock Braking System (ABS), Traction Control
Passive Safety Features:
Front airbags, side-impact airbags, front seatbelt pretensioners, reinforced safety cell
Infotainment System:
Optional BMW Professional Radio with CD player, optional navigation system (MK4 unit), optional Harman Kardon audio system.
Driver Assistance Features:
Park Distance Control (PDC) - optional.
Connectivity Options:
Optional Bluetooth hands-free system.
Oil Change Interval:
BMW Condition Based Service (CBS) system dictates intervals, typically around 7,500-15,000 miles or annually, depending on driving conditions.
Brake Fluid Flush:
Every 2 years, regardless of mileage.
Coolant Flush:
Every 2-4 years or 30,000-50,000 miles (BMW Blue Coolant).
Engine Oil Type:
BMW Longlife-01 (LL-01) approved synthetic oil, SAE 0W-40 or 5W-30.
Engine Oil Capacity:
Approx. 6.5 quarts (6.0 liters) for 3.0L engines.
Transmission Fluid Manual:
BMW MTF LT-2 or equivalent (e.g., Red Line D4 ATF for some applications).
Transmission Fluid Automatic:
BMW ATF LT-3 or equivalent.
Coolant Type:
BMW Blue Antifreeze/Coolant (G48 specification).
Known Issues:
Oil leaks from valve cover gasket and oil pan, VANOS solenoid issues, cooling system component failure (water pump, thermostat), CCV (Crankcase Ventilation) system clogging, subframe cracking (less common on coupes than sedans but possible), ABS/DSC sensor failures, power steering leaks.
Oil Filter Part Number Example:
Mann-Filter HU 925/4 X or Mahle OX 354/1 De
Cabin Air Filter Part Number Example:
Mann-Filter CU 2557 or Bosch 6041
Brand Heritage:
BMW, known for its 'Ultimate Driving Machine' slogan, has a long history of producing performance-oriented luxury vehicles, particularly coupes.
Model Evolution:
The 2004 Coupe is part of the E46 generation (1999-2006), which replaced the E36. It was praised for its improved chassis dynamics, updated styling, and more powerful engine options over its predecessor.
Production Years:
E46 Coupe produced from 1999 to 2006.
