🏷️ Basic Information

Make:

Mercedes-Benz

Model:

C-Class

Year:

2015

Chassis Code:

W204

Generation:

Third Generation (W204)

Market Segment:

Compact Executive

👋 Introduction

Positioning:

The 2015 Mercedes-Benz C-Class (W204) was positioned as a premium compact executive sedan and coupe, competing with vehicles like the BMW 3 Series and Audi A4. It offered a blend of luxury, performance, and advanced technology.

Key Competitors:

BMW 3 Series (F30), Audi A4 (B8), Lexus IS, Infiniti Q50, Cadillac ATS.

Salient Features:

Available in sedan and coupe body styles, multiple engine options, advanced safety features, luxurious interior, sophisticated ride and handling characteristics, optional 4MATIC all-wheel drive.

Dealership Equivalence:

This manual is the exact same resource utilized by Mercedes-Benz certified technicians in dealerships, ensuring unparalleled accuracy and completeness for all service and repair tasks.

📋 Manual Details

Primary Coverage:

All models and all repairs (A-Z) for the 2015 Mercedes-Benz C-Class (W204)

Estimated Pages:

Extensive (specific number not provided, but typical for dealership-level manuals is 2000+ pages)

Type:

Official Service and Repair Manual

Language:

English

Format:

Digital (likely PDF or similar, as implied by technician use and distribution)

📖 Manual Coverage

Engine Systems:

Engine mechanical (M271, M274, OM651), fuel injection, ignition, cooling, lubrication, exhaust, emissions control, engine management (ECU/ME) diagnostics and repair.

Transmission Systems:

7-speed automatic transmission (7G-TRONIC PLUS), manual transmission (where applicable), transmission control module (TCU), clutch, torque converter, drive shafts, differential.

Brake Systems:

Hydraulic brake system, ABS (Anti-lock Braking System), ESP (Electronic Stability Program), brake assist, parking brake (electric parking brake - EPB where equipped), brake pad and rotor replacement, bleeding procedures.

Suspension And Steering:

Front and rear suspension (independent multi-link), shock absorbers, springs, bushings, steering system (electric power steering - EPS), steering column, wheel alignment specifications.

Electrical Systems:

12V battery, alternator, starter motor, lighting system (headlights, taillights, interior), fuses, relays, wiring diagrams, body control modules (BCM), CAN bus communication, diagnostic connector (OBD-II).

Body And Interior:

Body panels, doors, hood, trunk, bumpers, interior trim, seats, airbags, seat belts, HVAC (Heating, Ventilation, and Air Conditioning) system, climate control, power windows, locks, mirrors.

Infotainment And Navigation:

COMAND infotainment system, Audio 20, media interface, Bluetooth connectivity, navigation system updates and troubleshooting, speaker systems.

Driver Assistance Systems:

Adaptive Cruise Control (DISTRONIC PLUS), Blind Spot Assist, Lane Keeping Assist, PARKTRONIC, rearview camera, Active Park Assist.

Maintenance Procedures:

Oil and filter change, air filter replacement, cabin air filter replacement, spark plug replacement, brake fluid flush, coolant flush, differential fluid change, transmission fluid service.

Troubleshooting:

Diagnostic trouble codes (DTCs), symptom-based troubleshooting guides, electrical system fault finding, engine performance issues, transmission shifting problems.

Repair Procedures:

Engine component replacement (e.g., alternators, starters, fuel injectors), brake caliper replacement, suspension component replacement, radiator replacement, alternator replacement, AC system recharge.

Diagnostic Procedures:

Scan tool usage, sensor testing, actuator testing, ECU diagnostics, reading live data streams, component activation tests.

Programming And Coding:

ECU re-flashing, module replacement and coding (e.g., BCM, TCU), key programming (requires specific dealer tools).

Depth:

Comprehensive: Covers basic maintenance, diagnostics, repair, and component overhaul. Suitable for professional technicians and advanced DIY enthusiasts.

📊 Manual Specifications

File Format:

Likely PDF. Searchable text is highly probable for ease of use.

Print Quality:

High-resolution images and diagrams, clear text. Designed for professional use.

Binding Type:

Not applicable for digital format. If a physical version were available, it would typically be a robust comb or perfect binding.

Paper Type:

Not applicable for digital format. For physical, would be high-quality, durable paper suitable for workshop environments.

⚙️ Engine Specifications

Engine Options 2015:

C250 (2.0L Turbocharged Inline-4 M274), C300 (3.5L Naturally Aspirated V6 M276 - early models/specific markets), C350e (Plug-in Hybrid - rare in W204, more common in W205), various AMG C63 variants (4.0L Twin-Turbo V8 M177 - not W204).

C250 Engine Specs:

M274 DE20 LA: 1991cc, 16-valve DOHC inline-4 turbocharged. Power: approx. 201 hp @ 5500 rpm. Torque: approx. 229 lb-ft @ 2000-4200 rpm.

C300 Engine Specs:

M276 DE35 LL: 3498cc, 24-valve DOHC V6 naturally aspirated. Power: approx. 248 hp @ 6500 rpm. Torque: approx. 251 lb-ft @ 3500-4500 rpm.

Fuel Delivery:

Direct fuel injection (Benzin-Direkteinspritzung), multi-point injection on some variants. Fuel type: Premium Unleaded (91 RON minimum recommended).

Emissions Compliance:

Meets EPA/CARB standards for 2015. Catalytic converter, oxygen sensors, evaporative emission control system.

🔧 Transmission

Transmission Type:

7-speed automatic transmission (7G-TRONIC PLUS) standard on most models.

Optional Transmission:

Manual transmission was available on some C250 models in certain markets but less common for 2015.

Transmission Features:

Adaptive shift programs, sport and comfort modes, manual mode with paddle shifters (on some models).

7G Tronic Plus Fluid:

MB Approved Automatic Transmission Fluid (ATF) - typically MB 236.14 (e.g., Febi Bilstein 29468, Pentosin ATF1).

📐 Dimensions

Wheelbase:

Approximately 108.7 inches (2762 mm).

Length:

Approximately 180.9 inches (4596 mm) for Sedan.

Width:

Approximately 70.7 inches (1797 mm).

Height:

Approximately 56.3 inches (1430 mm) for Sedan.

Trunk Capacity:

Approximately 16.6 cubic feet (470 liters) for Sedan.

Curb Weight:

Varies by model, but typically around 3400-3700 lbs (1540-1680 kg) for C250 sedan.

Standard Tire Size:

Typically 205/55 R16 or 225/45 R17 depending on trim and options.

Wheel Bolt Pattern:

5x112 mm.

Center Bore:

66.6 mm.

🛡️ Safety Features

NHTSA Rating:

Likely 5-Star overall safety rating from NHTSA (National Highway Traffic Safety Administration) based on available data for W204 generation.

IIHS Rating:

Likely 'Good' in most crashworthiness tests from IIHS (Insurance Institute for Highway Safety), potentially earning a Top Safety Pick designation.

Active Safety Systems:

ABS, EBD (Electronic Brakeforce Distribution), ESP, Brake Assist, Traction Control, Tire Pressure Monitoring System (TPMS), optional Pre-Safe anticipatory safety system, Blind Spot Assist, Lane Keeping Assist.

Passive Safety Features:

Multiple airbags (front, side, curtain, knee), crumple zones, reinforced passenger cell, active head restraints.

💡 Technology Features

Infotainment Systems:

Audio 20 (standard) and COMAND infotainment system (optional). Features include CD/DVD player, AM/FM radio, USB and auxiliary inputs, Bluetooth audio streaming and hands-free calling.

Optional Adas Features:

Adaptive Cruise Control (DISTRONIC PLUS), Blind Spot Assist (BAS), Lane Keeping Assist (LKA), Attention Assist, PARKTRONIC parking assistance, rearview camera.

Connectivity Options:

Bluetooth for phone and audio, optional Media Interface for iPod/USB connectivity, optional navigation system integrated into COMAND.

Headlight Options:

Halogen headlights with LED daytime running lights (DRLs) standard, optional Bi-Xenon headlights with LED DRLs, optional Intelligent Light System (ILS) with adaptive high beams.

🔧 Maintenance

Oil Change Interval:

Typically every 10,000 miles or 12 months, whichever comes first, under the 'flexible' service schedule (ASR). Can be shortened to 5,000 miles or 6 months for severe service conditions. Specific interval is determined by the 'service interval indicator' (Assyst Plus) based on driving style.

Major Service Interval:

Major services (e.g., spark plugs, transmission fluid) typically recommended around 30,000 - 60,000 miles, depending on specific component and service package (e.g., Service B).

Engine Oil Specification:

MB 229.5 or MB 229.51 (for models with diesel particulate filters). Viscosity: 0W-40 or 5W-40 synthetic oil is commonly recommended. Check owner's manual for exact specification.

Coolant Specification:

MB Approved Antifreeze/Coolant - typically based on MB 325.0 or MB 326.0 specification. Usually a silicate-free, long-life coolant (e.g., Mercedes-Benz Coolant Concentrate). Mix 50/50 with distilled water.

Brake Fluid Specification:

DOT 4 PLUS (MB 331.0 specification).

Power Steering Fluid:

For EPS (Electric Power Steering), no hydraulic fluid is required in the steering rack. Some variants might use hydraulic fluid for other systems. Check manual for specifics.

Common Issues W204:

Oil leaks from valve cover gasket and oil filter housing. Issues with the electric water pump on some models. C300 (M272 engine prior to 2012) had potential balance shaft sprocket wear; W204 2012+ models with M276 are less prone. Transmission control module issues. Early W204 models had timing chain guide issues (less common for 2015). Power steering pump failures (on hydraulic systems, not EPS). Climate control actuator failures.

Oil Filter Part Number:

Example: Mann-Filter HU 711/1 x or Mercedes-Benz A0001802609.

Air Filter Part Number:

Example: Mann-Filter C 30 005 or Mercedes-Benz A2710940204.

Cabin Filter Part Number:

Example: Mann-Filter CU 25 011 (activated carbon) or Mercedes-Benz A2048300218.

📚 Vehicle History

Mercedes Benz Legacy:

Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, safety, and innovation, dating back to the invention of the automobile.

C Class Lineage:

The C-Class has been Mercedes-Benz's entry-level luxury offering since its introduction in 1993, evolving through multiple generations (W201, W202, W203, W204, W205, etc.), consistently offering a balance of premium features and accessible luxury.

W204 Production Years:

The W204 generation was produced from 2007 to 2014. The 2015 model year likely represents a carry-over or very late production model, as the W205 generation debuted for the 2015 model year in many markets.

W204 Facelift Details:

The W204 received a significant facelift for the 2012 model year, introducing updated styling, new engine options, revised interior, and enhanced technology features.

🏆 Awards & Recognition

Typical Awards For Generation:

The W204 C-Class generation received numerous accolades during its production run, often recognized for its safety, luxury, and performance. Specific awards for the 2015 model year would depend on regional publications, but it typically placed well in comparison tests and category rankings.

Consumer Reports Rating:

Consumer Reports often rated the C-Class favorably for its driving dynamics and interior quality, though reliability ratings could vary by year and powertrain.

Certification Standard:

Meets all relevant automotive safety and emissions certifications for North American and European markets for the 2015 model year.