2014 Mercedes C-Class (W204) Service and Repair Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Model: C-Class Model Code: W204 Model Year: 2014 👋 Introduction Market Position Segment: Compact Executive Sedan/Coupe/Wagon Brand Perception: Luxury, safety, engineering, performance, prestige. Competitive...

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Type: Car

Vendor:

Sku: 183246

Tags: 2014 C-Class Car Cars Mercedes Misc W204

Product variants

Description

🏷️ Basic Information

Identification

Make:

Mercedes-Benz

Model:

C-Class

Model Code:

Model Year:

👋 Introduction

Market Position

Segment:

Compact Executive Sedan/Coupe/Wagon

Brand Perception:

Luxury, safety, engineering, performance, prestige.

Competitive Analysis

Primary Competitors:

BMW 3 Series, Audi A4, Lexus IS, Acura TL, Infiniti G37/Q50.

Key Features

Platform Design:

W204 platform known for robust construction and driver-focused dynamics.

Powertrain Options:

Wide range of efficient and powerful gasoline and diesel engines, often paired with advanced transmissions.

Safety Technology:

Pioneering safety features like ATTENTION ASSIST, COLLISION PREVENTION ASSIST, and advanced airbag systems.

Interior Quality:

Premium materials, refined ergonomics, and high-quality fit and finish characteristic of Mercedes-Benz.

📋 Manual Details

Coverage Areas

All Models Covered:

All Repairs Az:

Target Audience:

Professional Technicians & Advanced DIYers

Information Type:

Vehicle Specific, Not Generic

Page Count

Estimated Page Count:

Extensive, typically over 2000 pages for full dealership manuals

Manual Type

Manual Classification:

Factory Service Manual (FSM) / Workshop Manual

Language

Language:

English

Format

Format Availability:

Digital (PDF) - often searchable and printable

File Format

File Type:

Print Quality

Digital Quality:

High-resolution scans, often sourced from original factory manuals, ensuring clarity of text and diagrams.

Binding Type

Physical Format:

N/A (Digital Format)

Paper Type

Physical Format:

N/A (Digital Format)

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Complete diagnosis, overhaul, timing components, lubrication, cooling.

Engine Management:

Fuel injection systems (GDI/CRDI), ignition systems, emission controls (catalytic converters, EGR, O2 sensors), diagnostics and troubleshooting for all engine control units (ECU).

Transmission Automatic:

7-speed 7G-TRONIC PLUS (722.9) and other applicable transmissions, including control modules, hydraulic systems, torque converters, and fluid services.

Transmission Manual:

If applicable for specific W204 variants, full overhaul and clutch service details.

Drivetrain:

Driveshafts, CV joints, differentials, axles, propeller shafts.

Suspension:

Front and rear suspension components (struts, shocks, control arms, bushings, springs), alignment specifications, and troubleshooting.

Steering:

Power steering system (hydraulic or electro-hydraulic), steering rack, tie rods, steering column, steering angle sensor.

Brakes:

ABS, ESP, SBC (if applicable), brake calipers, rotors, pads, hydraulic lines, parking brake systems, brake fluid specifications and bleeding procedures.

Electrical System:

Battery, alternator, starter motor, lighting (headlights, taillights, interior), fuses, relays, wiring diagrams for all circuits.

Body And Chassis:

Body panel removal/installation, door mechanisms, glass replacement, convertible top operation (if applicable), underbody protection.

HVAC:

Air conditioning system diagnosis, refrigerant handling, climate control modules, blower motor, evaporator, condenser, heater core.

Interior Trim:

Seat removal, dashboard disassembly, trim panel replacement.

Infotainment And Electronics:

COMAND system, audio components, navigation, Bluetooth, telematics, instrument cluster, sensor diagnostics.

Safety Systems:

Airbag system diagnosis and replacement, seat belt pre-tensioners, crash sensor locations.

Procedures Included

Routine Maintenance:

Oil and filter changes, air filter replacement, cabin filter replacement, spark plug replacement, brake fluid flush, coolant replacement, interval service checks.

Troubleshooting Diagnostics:

System-specific diagnostic flowcharts, fault code interpretation (DTCs), component testing procedures, wiring harness troubleshooting.

Component Removal Installation:

Step-by-step instructions for removing and installing all major and minor components.

Engine Rebuild:

Detailed procedures for engine disassembly, inspection, machining, and reassembly, including torque specifications and clearances.

Transmission Overhaul:

Comprehensive guides for automatic and manual transmission repair, including clutch pack replacement, valve body servicing, and seal replacement.

Brake System Repair:

Pad and rotor replacement, caliper overhaul, brake line replacement, bleeding procedures.

Electrical Component Testing:

Testing of alternators, starters, sensors, actuators, and control modules using multimeters and oscilloscopes.

Suspension And Steering Alignment:

Detailed alignment specifications and adjustment procedures.

HVAC System Service:

Refrigerant recharge, leak detection, component replacement, flushing procedures.

Body And Exterior Repair:

Panel replacement, dent repair, rust treatment, glass installation.

Airbag System Replacement:

Safe procedures for handling and replacing airbag modules and related components.

Technical Depth

Diagnostic Capabilities:

Advanced diagnostics leveraging Mercedes-Benz proprietary diagnostic tools (e.g., STAR diagnosis/XENTRY) with detailed explanations of module programming, coding, and adaptations.

Repair Complexity:

Covers basic to highly complex repairs, including engine and transmission rebuilds, electronic module replacement and configuration, and advanced chassis work.

Special Tools:

Identifies and describes required special tools and equipment for specific procedures.

Torque Specifications:

Comprehensive listing of all critical torque specifications for fasteners across all vehicle systems.

Electrical Diagrams:

High-quality, detailed wiring diagrams with component identification and circuit tracing capabilities.

⚙️ Engine Specifications

Primary Engine

Engine Variant Examples:

C250 (1.8L Turbocharged Inline-4 M271), C300 (3.0L V6 M272), C350 (3.5L V6 M276), C350e (Plug-in Hybrid), various CDI diesel engines (e.g., OM651).

Performance

Horsepower Range:

Approximately 201 hp (C250) to 302 hp (C350). AMG variants like C63 offer significantly more.

Torque Range:

Approximately 229 lb-ft (C250) to 273 lb-ft (C350).

Fuel System

Fuel Delivery:

Direct Injection (GDI) for many gasoline engines, Common Rail Diesel Injection (CRDI) for diesel variants.

Engine Management System:

ME-SFI, CRDI control units with advanced diagnostic capabilities.

Engine Type

Induction:

Turbocharged, Naturally Aspirated (depending on variant).

🔧 Transmission

Standard

Transmission Type Standard:

7-speed Automatic (7G-TRONIC PLUS) - 722.9 series for most gasoline models.

Optional

Transmission Type Optional:

6-speed Manual Transmission (for select models/markets), 7-speed G-TRONIC for diesel models.

Features

Transmission Modes:

Comfort (C), Sport (S), Manual (M) shifting via paddle shifters or selector lever.

Fluid Specifications

Automatic Transmission Fluid:

MB-Approval 236.14 (e.g., Shell Spirax S6 ATF ZM, Fuchs Titan ATF 4134).

📐 Dimensions

Exterior

Wheelbase:

Approx. 2,760 mm (108.7 inches).

Length:

Approx. 4,591 mm (180.7 inches) for Sedan.

Width:

Approx. 1,770 mm (69.7 inches).

Height:

Approx. 1,447 mm (57.0 inches) for Sedan.

Weights

Curb Weight:

Varies by model, typically around 1,500 - 1,650 kg (3,300 - 3,640 lbs).

🛡️ Safety Features

Ratings

NHTSA Rating:

Generally rated highly, often 5-star overall safety ratings in various crash tests.

IIHS Top Safety Pick:

Often awarded 'Top Safety Pick' or 'Top Safety Pick+' by IIHS.

Active Features

Electronic Stability Program:

Standard ESP (Electronic Stability Program) with ASR (Acceleration Skid Control).

Anti Lock Braking System:

Standard ABS (Anti-lock Braking System) with BAS (Brake Assist System).

Driver Assistance Options:

ATTENTION ASSIST, COLLISION PREVENTION ASSIST, optional Distronic PLUS (adaptive cruise control), Blind Spot Assist, Lane Keeping Assist.

Passive Features

Airbag System:

Advanced multi-stage front airbags, side airbags, window curtain airbags, and knee airbags.

Seatbelts:

3-point seatbelts with pre-tensioners and belt force limiters.

💡 Technology Features

Infotainment

Infotainment System:

COMAND infotainment system with optional navigation, Bluetooth connectivity, USB integration, and CD/DVD player.

Driver Assistance

Advanced Driver Assistance Systems:

ATTENTION ASSIST, COLLISION PREVENTION ASSIST, Adaptive Cruise Control (DISTRONIC PLUS), Lane Keeping Assist, Blind Spot Assist, Parktronic (parking sensors).

Connectivity

Connectivity Features:

Bluetooth hands-free calling, audio streaming, optional Mercedes-Benz apps integration (depending on COMAND version and market).

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 10,000 miles or 1 year, or as indicated by the 'ASSYST PLUS' service indicator system, whichever comes first. Specific intervals may vary based on engine type and driving conditions.

Major Service A:

Generally performed every 10,000 miles. Includes oil and filter change, tire rotation, multi-point inspection.

Major Service B:

Generally performed every 20,000 miles. Includes Service A items plus cabin air filter replacement, brake inspection, etc.

Fluid Specifications

Engine Oil Specification:

MB-Approval 229.5 or 229.51 (e.g., Mobil 1 ESP Formula 5W-30, Castrol EDGE Professional OE 5W-30).

Coolant Specification:

MB-Approval 325.0 or 326.0 (Glycol-based, Silicate-free, Phosphate-free, Type A - Blue/Green)

Brake Fluid Specification:

DOT 4 Plus (MB-Approval 331.0)

Known Issues

Common Problems:

Oil cooler leaks (M271 engine), intake manifold flap runner failure (M272/M273 engines), transmission conductor plate failure (722.9), power steering pump issues, early W204 models may have some suspension component wear.

📚 Vehicle History

Brand Heritage

Manufacturer:

Mercedes-Benz, a global leader in luxury and automotive innovation since the late 19th century.

Model Evolution

W204 Generation:

Third generation of the C-Class, replacing the W203 and preceding the W205. Introduced in 2007, with a significant facelift in 2011.

Production

Production Years:

2007-2014 (W204 generation).

Manufacturing Locations:

Various Mercedes-Benz plants globally, including Germany, South Africa, and China.

🏆 Awards & Recognition

Recognitions

Safety Awards:

Consistent recognition from IIHS and NHTSA for safety performance.

Design Awards:

Often praised for its refined and elegant design, a hallmark of Mercedes-Benz styling.

Ratings

Reliability Perception:

While Mercedes-Benz vehicles are known for luxury and engineering, reliability perception can vary. This manual is crucial for proper maintenance to ensure longevity.