🏷️ Basic Information

Make:

Mercedes-Benz

Model:

C-Class

Model Code:

W204

Year:

2009

Covered Models:

C 230, C 300, C 350

👋 Introduction

Positioning:

The W204 C-Class represented Mercedes-Benz's entry into the compact executive sedan segment, competing with models like the BMW 3 Series and Audi A4. It emphasized a blend of comfort, performance, and advanced technology.

Competition:

Key competitors for the 2009 C-Class included the BMW E90 3 Series, Audi B8 A4, Lexus IS, and Infiniti G35/G37. The W204 aimed to differentiate itself with its distinctive styling, refined interior, and the renowned Mercedes-Benz safety and build quality.

Salient Features:

The 2009 W204 C-Class offered modern styling, a driver-focused interior, advanced safety systems (like optional Intelligent Light System and PRE-SAFE), and a range of potent yet efficient V6 engines.

📋 Manual Details

Manual Coverage Overview:

Comprehensive owner's manual detailing operation, maintenance, safety, and features for the 2009 Mercedes-Benz C-Class (W204) models C 230, C 300, and C 350.

Estimated Page Count:

~300-400 pages (typical for this era's Mercedes-Benz manuals)

Type:

Owner's Manual / Operator's Manual

Language:

English

Format:

Printed booklet

📖 Manual Coverage

Engine Management:

Operation, basic troubleshooting, fluid checks, and recommended maintenance for the specified engine variants.

Powertrain Operation:

Information on transmission operation, gear selection, and parking brake usage.

Chassis Systems:

Details on brakes, steering, and suspension operation, including tire pressure and wheel care.

Electrical Systems:

Operation of lighting, wipers, climate control, and basic electrical features.

Infotainment And Comfort:

Operation of the onboard computer, displays, climate control, and seating adjustments.

Safety Systems:

Explanation of safety features, seatbelt usage, airbags, and driving assistance systems.

Driving Operations:

Detailed instructions on driving, parking, and engaging the vehicle.

Lighting And Wipers:

Operation of headlights, interior lights, and windshield wipers, including automatic functions.

Climate Control Operation:

Guidance on using the automatic climate control system for optimal comfort.

Seat And Mirror Adjustment:

Instructions for adjusting seats, steering wheel, and mirrors for optimal driving position and visibility.

Loading And Stowing:

Information on maximizing cargo space and properly securing items.

Maintenance Checks:

Guidance on routine checks like fluid levels and tire pressure.

Breakdown Assistance:

Steps to take in case of a breakdown, including the use of emergency equipment.

Depth:

Owner-level maintenance and operation. Focuses on understanding vehicle features, performing basic checks, and safe operation. Does not include detailed diagnostic procedures or repair instructions typically found in a service manual.

📊 Manual Specifications

Format Details:

Typically a high-quality printed publication with clear diagrams and legible text.

Print Quality:

Professional, high-resolution printing typical of OEM Mercedes-Benz publications.

Binding:

Stapled or perfect bound booklet.

Paper Quality:

Durable, glossy paper stock designed for longevity in a vehicle environment.

⚙️ Engine Specifications

C230 Engine:

2.5L M272 E25 V6

C230 Horsepower:

201 hp @ 6100 rpm

C230 Torque:

180 lb-ft @ 2950 rpm

C300 Engine:

3.0L M272 E30 V6

C300 Horsepower:

228 hp @ 6000 rpm

C300 Torque:

221 lb-ft @ 2700 rpm

C350 Engine:

3.5L M272 E35 V6

C350 Horsepower:

268 hp @ 6000 rpm

C350 Torque:

258 lb-ft @ 2400 rpm

Fuel Delivery:

Electronic fuel injection (EFI) with multi-point injection (MPI).

Recommended Fuel:

Premium Unleaded gasoline (91 octane or higher recommended).

Emission Control:

On-board diagnostics (OBD-II) compliant, catalytic converter.

🔧 Transmission

Transmission Type C230 C300:

7-speed automatic (7G-TRONIC)

Transmission Type C350:

7-speed automatic (7G-TRONIC)

Optional Transmission:

6-speed manual (available on select C300 models in some markets).

Transmission Features:

Driver-selectable modes (Comfort, Sport), manual shift mode via steering wheel paddle shifters (optional on some trims).

Transmission Fluid Type:

MB-Approval 236.14 Automatic Transmission Fluid (e.g., Pentosin ATF1)

📐 Dimensions

Length:

~181.8 inches (4620 mm)

Width:

~69.7 inches (1770 mm)

Height:

~56.4 inches (1433 mm)

Wheelbase:

~108.7 inches (2760 mm)

Curb Weight C230:

~3450 lbs (1565 kg)

Curb Weight C300:

~3470 lbs (1575 kg)

Curb Weight C350:

~3520 lbs (1600 kg)

Trunk Volume:

~12.4 cubic feet (350 liters)

🛡️ Safety Features

NHTSA Front Crash Test:

5-Star

IIHS Front Offset Crash Test:

Good

IIHS Side Impact Crash Test:

Good

IIHS Roof Strength:

Good

Electronic Stability Control:

Standard (ESP - Electronic Stability Program)

Traction Control:

Standard (ASR - Acceleration Slip Regulation)

Antilock Brakes:

Standard (ABS)

Airbags Front:

Dual front airbags with two-stage deployment.

Airbags Side:

Front side-impact airbags.

Airbags Curtain:

Front and rear side-curtain airbags (window bags).

Head Restraints:

Active front head restraints (NECK-PRO).

Seat Belts:

3-point inertia-reel seat belts with belt tensioners and force limiters.

💡 Technology Features

Comand System:

Optional COMAND (Cockpit Management and Navigation Display) system with integrated navigation, radio, CD/DVD player, and auxiliary inputs.

Display Technology:

Central color display screen for infotainment and vehicle settings, integrated into the dashboard.

Intelligent Light System:

Optional adaptive headlight system that adjusts beam pattern based on speed and steering angle.

Pre Safe System:

Standard or optional PRE-SAFE® system that anticipates and reacts to potential collisions by tightening seatbelts, adjusting seats, and closing windows.

Parking Assistance:

Optional PARKTRONIC parking assist system with audible and visual warnings.

Bluetooth Interface:

Optional Bluetooth hands-free communication system.

Media Interface:

Optional Media Interface (MI) for connecting external audio devices (e.g., iPod).

🔧 Maintenance

Oil Change Interval:

Typically every 10,000 miles or 12 months, whichever comes first, using synthetic oil. Actual interval may vary based on driving conditions and model year specifics.

Major Service Interval:

Scheduled maintenance typically around 20,000-30,000 miles (e.g., Inspect brake system, suspension, exhaust, check drive belts, replace cabin air filter).

Engine Oil Specification:

MB-Approval 229.5 Synthetic Engine Oil (e.g., Mobil 1 0W-40, Castrol Syntec 0W-40)

Coolant Specification:

MB-Approval 325.0 or 326.0 (Antifreeze/Coolant Concentrate)

Brake Fluid Specification:

DOT 4 Plus (MB-Approval 331.0)

Common Issues M272 Engine:

M272 engines (especially earlier ones) can be prone to timing chain wear due to faulty balance shaft sprockets, leading to check engine lights and potential misfires. Coolant leaks from the thermostat housing or water pump are also reported.

Common Issues Electronics:

Various electronic modules can sometimes experience faults, leading to dashboard warning lights or system malfunctions. Parking sensor failures are not uncommon.

Common Issues Suspension Steering:

Worn control arm bushings or ball joints can lead to steering looseness and premature tire wear.

📚 Vehicle History

Heritage:

Mercedes-Benz, founded in 1926, has a long-standing reputation for luxury, engineering excellence, and pioneering automotive safety.

W204 Generation:

The W204 generation of the C-Class was introduced for the 2008 model year, succeeding the W203. It marked a significant shift in design and technology for the C-Class line, adopting a more aggressive and sporty aesthetic.

Production Period:

The W204 platform was produced from 2007 to 2014. The 2009 model year falls within the early production phase of this generation.

Manufacturing Locations:

Key assembly plants included Sindelfingen, Germany; Bremen, Germany; Tuscaloosa, Alabama, USA; and Beijing, China (for the Chinese market).

🏆 Awards & Recognition

IIHS Top Safety Pick:

The 2009 Mercedes-Benz C-Class was frequently recognized as an IIHS Top Safety Pick due to its strong performance in crash tests.

Consumer Reports Reliability:

Consumer Reports reliability ratings for this model year often placed it in the average to above-average category, with some specific model year concerns noted.