Positioning:
The 2003 Mercedes-Benz E320 (W211 generation) was positioned as a premium mid-size luxury sedan, competing with vehicles like the BMW 5 Series, Audi A6, and Lexus GS.
Key Competitors:
BMW 5 Series (E60), Audi A6 (C6), Lexus GS, Cadillac CTS, Volvo S80.
Innovations:
The W211 generation introduced advanced safety features and a refined driving experience, building on Mercedes-Benz's reputation for engineering and luxury.
Target Audience:
Discerning buyers seeking comfort, performance, advanced technology, and the prestige associated with the Mercedes-Benz brand.
Engine:
Detailed diagnosis, repair, and overhaul procedures for the M112 E32 3.2L V6 SOHC engine.
Engine Management:
Component identification, sensor readings, diagnostic trouble codes (DTCs), fuel injection, ignition system, emissions control.
Transmission:
Procedures for the 722.6 '5G-TRONIC' 5-speed automatic transmission, including fluid service, hydraulic control, and electronic module diagnosis.
Drivetrain:
Rear-wheel drive (RWD) and 4MATIC all-wheel drive (AWD) systems, including differential, driveshaft, and axle servicing.
Suspension:
Front and rear suspension components, including struts, shocks, control arms, bushings, and alignment procedures. Includes details on AIRMATIC air suspension if applicable to the specific trim.
Brakes:
Front and rear disc brake systems, ABS, ESP (Electronic Stability Program) components, hydraulic lines, and bleeding procedures.
Steering:
Power steering system, steering gear, column, and related components.
Electrical System:
Comprehensive wiring diagrams, fuse box locations, relay functions, power distribution, starter, alternator, and battery servicing.
Body And Interior:
Body panel removal and installation, door mechanisms, interior trim, seating, and comfort features.
Climate Control:
Automatic climate control (THERMATIC/THERMOTRONIC) system, A/C compressor, refrigerant servicing, blower motor, and actuators.
Safety Systems:
SRS airbag system diagnosis and component replacement, seatbelt pre-tensioners.
Maintenance:
Scheduled maintenance tasks, oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, drive belt inspection and replacement.
Troubleshooting:
Diagnostic flowcharts and symptom-based troubleshooting for various mechanical and electrical issues.
Repair:
Step-by-step repair instructions for component replacement, system overhauls, and common failures.
Diagnostics:
Procedures for using diagnostic scan tools (e.g., STAR DIAGNOSIS), interpreting data streams, and performing actuator tests.
Installation:
Instructions for installing replacement parts and accessories.
Depth:
Comprehensive, covering basic maintenance to advanced diagnostics and major component overhauls. Suitable for professional technicians and advanced DIY enthusiasts.
Configuration:
3.2L (3199 cc) V6 SOHC 18-valve
Horsepower:
221 hp @ 5,750 rpm
Torque:
232 lb-ft @ 3,150 rpm
Injection Type:
Sequential multi-point fuel injection (MPI) with Electronic Throttle Control (ETC).
Fuel Type:
Premium Unleaded Gasoline (91+ Octane Recommended)
Bore X Stroke:
89.9 mm x 84.0 mm
Compression Ratio:
10.0:1
Engine Oil Capacity:
8.0 Liters (approx. 8.5 US Quarts) with filter change. Refer to manual for exact capacity and correct oil specification.
Engine Oil Specification:
MB 229.5 Specification SAE 0W-40 or 5W-40 synthetic oil.
Type:
5-Speed Automatic (722.6 '5G-TRONIC')
All Wheel Drive:
Optional 4MATIC all-wheel drive system available on some models.
Gear Ratios:
Specific gear ratios are detailed in the manual, crucial for diagnostics and repair.
Transmission Fluid Type:
MB 236.10 Specification Automatic Transmission Fluid (ATF).
Transmission Fluid Capacity:
Approximately 8.0 Liters (Pan Drop and Filter Replacement). Overhaul capacity is higher. Always verify capacity with manual and dipstick readings.
Length:
Approx. 190.9 inches (4849 mm)
Width:
Approx. 71.7 inches (1821 mm)
Height:
Approx. 57.0 inches (1448 mm)
Wheelbase:
Approx. 113.1 inches (2873 mm)
Curb Weight:
Approx. 3,600 - 3,800 lbs (1633 - 1724 kg), depending on options like 4MATIC.
NHTSA Front Crash Test:
5-Star (Driver and Passenger) - Based on historical data for similar W211 models.
IIHS Crash Test Ratings:
Good in frontal offset and side impact tests (typical for this era Mercedes-Benz).
Electronic Stability Program:
Standard ESP (Electronic Stability Program) and ABS (Anti-lock Braking System).
Traction Control:
Traction Control System (TCS).
Airbags:
Frontal airbags, side airbags, curtain airbags. Specific configurations may vary by market and option packages. Manual covers SRS system diagnostics.
Seatbelts:
Pre-tensioning seatbelts with force limiters.
Audio System:
COMAND (Cockpit Management and Navigation) system with options for CD player, navigation, and premium audio systems (e.g., Bose).
Display:
Central color display for infotainment, navigation, and vehicle settings.
Cruise Control:
Standard cruise control and optional DISTRONIC adaptive cruise control.
Parking Assist:
Optional Parktronic parking assist system.
Phone Integration:
Optional Bluetooth phone preparation or integrated teleaid services.
Oil Change Interval:
Typically every 10,000 miles (16,000 km) or 12 months, whichever comes first, using synthetic oil meeting MB 229.5 specification. The vehicle's Flexible Service System (FSS) will indicate when service is due.
Major Service:
Major services (e.g., spark plugs, transmission service, coolant flush) are typically scheduled at higher mileages, detailed in the manual. For example, spark plugs around 60,000-100,000 miles, transmission service around 40,000-60,000 miles depending on driving conditions.
Coolant:
MB 325.0 (Glysantin G05) or equivalent; typically a 50/50 mix with distilled water.
Brake Fluid:
DOT 4 PLUS (MB Specification 331.0 or 332.0).
Common Problems:
Potential issues can include early failure of the Sensotronic Brake Control (SBC) system (if equipped), ignition coil failure, fuel pump issues, and suspension component wear (e.g., bushings, ball joints). Detailed troubleshooting for these is within the manual.
Specific Failures:
Check for potential oil leaks from valve cover gaskets or oil cooler seals. Water pump leaks are also a possibility. The manual provides repair procedures for all these.
Heritage:
Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, safety, and durability, established over a century of automotive innovation.
Generation:
This is the first generation of the E-Class designated as the W211, succeeding the W210 E-Class. It marked a significant redesign with updated styling and technology.
Production Years:
2002-2009 (for the W211 generation worldwide). The 2003 model year is early in this generation's lifecycle.
