On-board diagnostics (OBD-II), live data interpretation, sensor testing, actuator testing, specific BMW diagnostic tools (e.g., DIS, ISTA - if covered by manual's scope)
Technical Depth
Depth:
Comprehensive: Covers routine maintenance, preventative care, troubleshooting, and detailed repair procedures for all major vehicle systems.
📊 Manual Specifications
File Format
File Type:
PDF
Searchable Text:
Yes
Printable:
Yes
Print Quality
Image Resolution:
High-resolution, clear diagrams and illustrations
Binding Type
Binding:
N/A (Digital Format)
Paper Type
Paper Quality:
N/A (Digital Format)
⚙️ Engine Specifications
Primary Engine
Engine Code:
M54B25
Configuration:
2.5L (2494cc) Naturally Aspirated Inline-6
Bore X Stroke:
84.0 mm x 75.0 mm
Compression Ratio:
10.2:1
Performance
Horsepower:
184 hp @ 6000 rpm
Torque:
232 Nm (171 lb-ft) @ 3500 rpm
Fuel System
Fuel Delivery:
Electronic Fuel Injection (EFI) with sequential port injection
Fuel Type:
Premium Unleaded Gasoline (91 AKI or higher recommended)
Dynamic Stability Control (DSC) with Traction Control
Braking System:
Anti-lock Braking System (ABS)
Passive Features
Airbags:
Frontal airbags, optional front side-impact airbags
Seatbelts:
3-point inertia-reel seat belts with pretensioners and force limiters
Head Restraints:
Active head restraints (front seats) on some models
💡 Technology Features
Infotainment
Head Unit:
BMW Professional Radio, optional CD changer, optional navigation system (CCC)
Speakers:
Standard 6-speaker system, optional Harman Kardon premium audio
Driver Assistance
Cruise Control:
Standard electronic cruise control
Parking Sensors:
Optional rear Park Distance Control (PDC)
Connectivity
Auxiliary Input:
Not standard on most models, often added aftermarket or via specific adapters for older head units.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Variable Oil Service Interval (SI) system, typically around 10,000-15,000 miles or 12-24 months, depending on driving conditions.
Air Filter Replacement:
Inspect every 30,000 miles, replace as needed or every 60,000 miles.
Cabin Filter Replacement:
Replace annually or every 15,000 miles.
Spark Plug Replacement:
Typically every 100,000 miles for Long Life spark plugs (e.g., NGK BKR6EQUP).
Brake Fluid Flush:
Every 2 years, regardless of mileage.
Fluid Specifications
Engine Oil Type:
BMW Longlife-01 (LL-01) synthetic oil, SAE 5W-30 or 5W-40
Engine Oil Capacity:
6.5 liters (6.9 US quarts) with filter change
Coolant Type:
BMW Blue Coolant (G48) or equivalent, mixed 50/50 with distilled water
Coolant Capacity:
Approx. 8.0 liters (8.5 US quarts)
Known Issues
Oil Pan Gasket Leaks:
Common on high-mileage vehicles due to age and material degradation.
Cooling System Leaks:
Plastic components like the expansion tank, hoses, and water pump can become brittle and leak.
Vanos (Variable Valve Timing):
Solenoids or seals can fail, leading to rough idling, loss of power, and increased fuel consumption.
Pcv (Positive Crankcase Ventilation) System:
Clogged PCV valves or hoses can cause oil leaks and engine performance issues.
ABS/Dsc Sensor Failures:
Wheel speed sensors can fail, triggering ABS and DSC warning lights.
Window Regulator Failure:
Plastic components in window regulators are prone to breaking.
Headliner Sagging:
Adhesive failure causes the fabric headliner to sag.
📚 Vehicle History
Brand Heritage
Bmw Legacy:
BMW has a long-standing reputation for producing sporty, well-engineered vehicles with a focus on driving pleasure.
Model Evolution
E46 Generation:
The E46 is the fourth generation of the BMW 3 Series, produced from 1998 to 2006, succeeding the E36 and preceding the E90. It represented a significant evolution in design, technology, and engineering.
325I Positioning:
The 325i was positioned as a mid-range model within the E46 lineup, offering a blend of performance, comfort, and luxury, slotting between the 320i/323i and the 330i.
Production
Production Period:
1999-2005
Manufacturing Plants:
Primarily Dingolfing and Regensburg, Germany; also South Africa, Thailand, and Mexico for specific markets.
🏆 Awards & Recognition
Recognitions
Car And Driver 10Best:
The E46 3 Series was a consistent recipient of Car and Driver's 10Best awards in various configurations during its production run, recognized for its exceptional driving dynamics and overall excellence.
Ward 3Best Engines:
The M54 engine family, including the M54B25, has been recognized for its smooth power delivery and refinement.