Vehicle Segment:
Compact Executive Car (Entry-level Luxury)
Target Audience:
Luxury vehicle owners seeking high-quality engineering, comfort, and advanced technology
Key Competitors:
BMW 3 Series, Audi A4, Lexus IS, Cadillac ATS, Volvo S60
Segment Strengths:
Renowned for luxury, advanced technology, comfortable ride, strong brand prestige, and a wide range of powertrain options
Design Language:
Fluidic sculpture, elegant lines, advanced LED lighting, premium interior materials
Technology Integration:
State-of-the-art infotainment, sophisticated driver assistance systems, optional AIRMATIC suspension
Powertrain Variety:
Efficient turbocharged four-cylinder engines, powerful V6 biturbo engines, and economical diesel options, including AMG performance variants
Engine Mechanical:
Detailed procedures for all W205 engine variants including M274 (2.0L Turbo I4), M276 (3.0L Bi-Turbo V6), OM651 (2.1L Turbo Diesel I4), OM654 (2.0L Turbo Diesel I4)
Engine Management:
Engine control modules (ECM), fuel injection systems (direct and indirect), ignition systems, emissions control systems, turbocharging, variable valve timing
Transmission:
7G-TRONIC PLUS (722.9), 9G-TRONIC (725.0) automatic transmissions: overhaul, diagnostics, fluid service, mechatronics
Drivetrain:
All-wheel drive (4MATIC) system, differential service, axle shafts, driveshafts
Suspension:
Front and rear suspension components, shock absorbers, springs, control arms, steering knuckles, AIRMATIC air suspension system
Steering:
Electric Power Steering (EPS) system, steering column, tie rods, alignment specifications
Brakes:
Hydraulic brake system, ABS, ESP, SBC (if applicable), brake pad and rotor replacement, bleeding procedures, parking brake system
Electrical System:
12V battery system, charging system (alternator), starter motor, fuses, relays, wiring diagrams (comprehensive)
Body And Interior:
Body panel removal and installation, door mechanisms, interior trim, seats, airbags, HVAC system (climate control)
Comfort Systems:
Power windows, power seats, sunroof, ambient lighting, keyless-go
Infotainment And Navigation:
COMAND system, audio systems, navigation module, Bluetooth connectivity, media interface
Driver Assistance Systems:
Distronic Plus, Active Park Assist, Lane Keeping Assist, Blind Spot Assist, Pre-Safe system, radar and sensor calibration
Diagnostics And Troubleshooting:
OBD-II diagnostics, fault code interpretation, troubleshooting charts, symptom-based diagnostics
Routine Maintenance:
Oil and filter changes, air filter replacement, cabin filter replacement, spark plug replacement, fluid checks and top-offs
Major Repairs:
Engine rebuilding, transmission overhaul, component replacement (alternator, starter, water pump, fuel pump), brake caliper replacement
Component Removal And Installation:
Step-by-step instructions for removing and installing all major and minor components
Diagnostics And Testing:
Methods for testing electrical components, sensors, actuators, and mechanical systems
Calibration And Adjustment:
Procedures for calibrating sensors, aligning steering, and adjusting various systems
Special Tool Identification:
Lists of required specialized tools and their applications
Depth:
Comprehensive (from basic maintenance to complete engine and transmission rebuilds)
Diagnostic Level:
Advanced (includes wiring diagrams, sensor data interpretation, and fault code troubleshooting)
Rebuild Procedures:
Detailed step-by-step rebuild procedures for major mechanical assemblies
โ๏ธ Engine Specifications
Engine Family:
M274 (Petrol I4), M276 (Petrol V6), OM651 (Diesel I4), OM654 (Diesel I4)
Common Variants Covered:
C 250 (M274 2.0L), C 300 (M274 2.0L), C 400/C 450 AMG Sport (M276 3.0L Bi-Turbo), C 220 d (OM651 2.1L), C 250 d (OM651 2.1L), C 300 d (OM654 2.0L)
Example Horsepower Range:
170 hp to 367 hp (excluding AMG C63)
Example Torque Range:
236 lb-ft to 384 lb-ft (excluding AMG C63)
Injection Type:
Direct Injection (BlueDIRECT), Indirect Injection (older/diesel variants)
Fuel Type:
Premium Unleaded Gasoline (RON 95/98), Diesel Fuel
Block Material:
Aluminum Alloy
Cylinder Head Material:
Aluminum Alloy
NHTSA Rating:
Generally 5-Star Overall (varies by specific model year and configuration)
IIHS Top Safety Pick:
Often awarded Top Safety Pick or Top Safety Pick+
Standard Active Safety:
ATTENTION ASSIST, COLLISION PREVENTION ASSIST PLUS, ESP, ABS
Optional Active Safety:
DISTRONIC PLUS (Adaptive Cruise Control), Active Lane Keeping Assist, Active Blind Spot Assist, PRE-SAFEยฎ Brake
Airbags:
Front airbags, side airbags, knee airbags, front and rear head curtain airbags
Structure:
High-strength steel safety cell, crumple zones
System Name:
COMAND (Cockpit Management and Navigation)
Features:
High-resolution display, Bluetooth audio streaming, USB connectivity, voice control, optional Apple CarPlay and Android Auto (later models/updates), Burmester surround sound system
Adaptive Cruise Control:
DISTRONIC PLUS (optional), provides automatic distance control and can assist with braking and acceleration in traffic.
Parking Assist:
Active Park Assist (optional), guides the vehicle into parking spaces. PARKTRONIC parking sensors also standard or optional.
Lane Management:
Lane Keeping Assist, Active Lane Keeping Assist (optional), Blind Spot Assist (optional)
Bluetooth Functionality:
Hands-free calling, audio streaming
Media Interface:
Provides connection for external audio devices (iPod, USB).
Oil Change Interval:
Flexible, typically based on ASSYST PLUS system, around 10,000-15,000 miles or 12 months, whichever comes first (depending on driving conditions and oil quality)
Major Service Interval:
Service A/B intervals, typically every 20,000 miles (Service A) and 40,000 miles (Service B), including brake fluid changes (every 2 years) and coolant changes (every 5 years).
Engine Oil:
MB Spec 229.5 or 229.51 (e.g., Mobil 1 ESP 0W-40 or 5W-30, depending on engine variant and emissions requirements)
Coolant:
MB Spec 325.0 / 326.0 (Concentrate) or MB Spec 326.5 / 326.6 (Pre-diluted) - typically a silicate-free, phosphate-free organic acid technology (OAT) coolant
Brake Fluid:
DOT 4 Plus (MB Spec 331.0)
Common Problems:
Leaking valve cover gaskets (M274), transmission control module (TCM) issues (7G-TRONIC), diesel particulate filter (DPF) regeneration issues (OM651), potential battery drain from parasitic loads, HVAC blower motor resistor failures, minor electrical gremlins
Diesel Specific Issues:
AdBlue system issues (if equipped), NOx sensor failures, glow plug failures
Common Repairs Covered:
Diagnosing and replacing sensors, fixing oil leaks, transmission service and repair, brake system servicing, software updates for ECUs
Manufacturer:
Mercedes-Benz (Daimler AG)
Legacy:
Long history of innovation in automotive safety, comfort, and engineering since the late 19th century
W205 Generation:
Fourth generation C-Class, introduced for the 2015 model year, replacing the W204 generation.
Design Philosophy:
Shift towards a more modern, progressive, and coupe-like design; significant increase in technological features and luxury appointments, heavily influenced by the S-Class.
Manufacturing Locations:
Bremen, Germany; East London, South Africa; Beijing, China (for Chinese market)
