🏷️ Basic Information

Make:

Mercedes-Benz

Model:

SLK230

Year:

2003

Generation Code:

R170 (Second Generation)

Engine Code:

M111 E23 ML

👋 Introduction

Market Position:

The 2003 Mercedes-Benz SLK230 represents the compact luxury roadster segment, offering a blend of performance, style, and the prestigious Mercedes-Benz brand. It competed with vehicles like the BMW Z3, Porsche Boxster, and Audi TT.

Competitive Analysis:

The SLK230 was known for its innovative Vario-Roof retractable hardtop, providing coupe-like security and convertible freedom. It offered a more accessible entry point into Mercedes-Benz roadster ownership compared to the larger SL models.

Key Features:

Supercharged inline-4 engine, Vario-Roof retractable hardtop, Rear-wheel drive, Compact sporty styling, Mercedes-Benz build quality and safety.

Vario Roof System:

Electrically operated retractable hardtop with integrated rollover protection system.

📋 Manual Details

Coverage Areas:

Engine, Transmission, Drivetrain, Suspension, Steering, Brakes, Electrical System, HVAC, Body, Interior, Maintenance, Diagnostics, Troubleshooting, Repair Procedures

Page Count:

Estimated 1000+ pages (typical for comprehensive factory service manual software)

Manual Type:

Service and Repair Manual Software

Language:

English

Format:

Digital Software (Likely PDF or proprietary executable)

Source:

Official Mercedes-Benz Service and Repair Manual

📖 Manual Coverage

Engine Systems:

Engine Mechanical, Engine Control System (ECU), Fuel System, Ignition System, Cooling System, Lubrication System, Exhaust System, Supercharger System

Drivetrain Systems:

Transmission (Automatic), Drive Axles, Differential

Chassis Systems:

Suspension (Front & Rear), Steering System, Brake System (ABS, ESP), Wheels & Tires

Electrical Systems:

Wiring Diagrams, Fuses & Relays, Lighting System, Battery & Charging System, Ignition System, Instrument Cluster, Audio System, Power Accessories (Windows, Locks, Seats), Convertible Top System

Comfort Systems:

Climate Control (HVAC), Interior Trim, Seats, SRS Airbag System

Instrumentation And Controls:

Dashboard Layout, Gauge Functions, Switchgear Operation, Climate Control Panel Operation

Fuel System Details:

Fuel Tank, Fuel Pump, Fuel Filter, Fuel Injectors, Fuel Pressure Regulator

Maintenance Procedures:

Oil Changes, Filter Replacements, Fluid Checks & Replacements, Spark Plug Replacement, Belt Inspection & Replacement, Brake Pad/Rotor Replacement, Tire Rotation

Repair Procedures:

Engine Component Overhaul, Transmission Service & Rebuild, Suspension Component Replacement, Brake System Repair, Electrical Component Diagnosis & Replacement, HVAC System Repair, Convertible Top Mechanism Repair

Diagnostic Procedures:

Troubleshooting Guides, Diagnostic Trouble Codes (DTCs), Component Testing, Wiring Harness Diagnosis, Scan Tool Procedures

Body And Interior Procedures:

Door Panel Removal, Bumper Replacement, Headlight/Taillight Replacement, Seat Removal, Convertible Top Mechanism Adjustment and Repair

Steering System Repair:

Power Steering Pump Replacement, Steering Gearbox Diagnosis and Replacement, Tie Rod End Replacement

Technical Depth:

Comprehensive: Covers routine maintenance, diagnostics, repair, and overhaul procedures for all major vehicle systems. Includes detailed specifications and tolerances.

Diagnostic Tools Required:

Star Diagnosis System (SDS) or compatible OBD-II scanner with Mercedes-specific protocols is highly recommended for advanced diagnostics.

📊 Manual Specifications

File Format:

Likely .exe or .pdf (searchable text is a key feature of quality software manuals)

Print Quality:

N/A (Digital Software)

Binding Type:

N/A (Digital Software)

Paper Type:

N/A (Digital Software)

Searchability:

High (digital software typically allows keyword searches for specific components or procedures)

Updateability:

N/A (Static digital manual)

⚙️ Engine Specifications

Engine Type:

Inline 4-Cylinder, Supercharged

Displacement:

2.3 Liters (2295 cc)

Engine Code:

M111 E23 ML

Horsepower:

192 hp @ 5300 rpm

Torque:

201 lb-ft @ 2500-4800 rpm

Fuel System:

Electronic Fuel Injection (EFI), Bosch Motronic M4.1

Supercharger:

Intercooled Roots-type Supercharger

Fuel Type:

Premium Unleaded Gasoline (91+ octane recommended)

Ignition Type:

Distributorless Electronic Ignition (CDI)

Cooling Capacity:

Approximately 7.5 Liters (Coolant)

Oil Capacity:

Approximately 5.5 Liters (with filter)

Oil Specification:

MB 229.5 or 229.51 (SAE 0W-40 or 5W-40 synthetic)

Engine Management System:

ME 2.8 Engine Control Unit (ECU)

Emissions Certification:

Federal Tier 1 Emissions Compliant

🔧 Transmission

Transmission Type:

5-Speed Automatic Transmission (5G-TRONIC)

Optional Transmission:

6-Speed Manual Transmission (Rare)

Transmission Features:

TouchShift manual shifting mode

Transmission Fluid Type:

MB 236.12 (ATF LT 71141 or equivalent)

Automatic Gear Ratios:

1st: 3.93, 2nd: 2.43, 3rd: 1.47, 4th: 1.00, 5th: 0.73, Reverse: 3.39

📐 Dimensions

Length:

157.3 inches (4000 mm)

Width:

67.9 inches (1725 mm)

Height:

50.1 inches (1272 mm)

Wheelbase:

82.5 inches (2096 mm)

Curb Weight:

Approximately 3050 lbs (1383 kg)

Gross Vehicle Weight Rating:

Approx. 3750 lbs (1700 kg)

Cargo Volume Trunk:

5.3 cu ft (150 L) with roof up; 11.2 cu ft (317 L) with roof down (Vario-Roof stowed)

🛡️ Safety Features

NHTSA Front Crash Rating:

4 Stars (Driver), 5 Stars (Passenger) - Older rating methodology

IIHS Side Crash Rating:

Not Rated (Vehicle design predates comprehensive side impact testing standards)

Active Safety Features:

Anti-lock Braking System (ABS), Electronic Stability Program (ESP), Traction Control System (ASR)

Passive Safety Features:

Driver and Passenger Front Airbags, Side Impact Airbags, Roll-over Protection System (Pop-up Bars), Seatbelt Pretensioners

Rollover Protection:

Active roll bar system that deploys automatically in the event of a rollover.

💡 Technology Features

Infotainment System:

Factory AM/FM CD player, Optional Bose sound system, Optional CD changer. Basic display for radio and climate control.

Driver Assistance Features:

Cruise Control, Optional Parktronic (parking sensors)

Connectivity Features:

Limited by era; primarily analog systems. Optional hands-free cellular phone preparation (often requiring cradle).

Convenience Features:

Power windows, Power locks, Remote keyless entry, Electrically adjustable seats (with memory function), Automatic climate control, Heated seats.

🔧 Maintenance

Oil And Filter Change:

Every 10,000 miles (16,000 km) or 1 year, whichever comes first (using synthetic oil)

Air Filter Replacement:

Every 30,000 miles (48,000 km) or as needed based on inspection

Cabin Filter Replacement:

Every 15,000 miles (24,000 km) or 1 year

Spark Plug Replacement:

Every 60,000 miles (96,000 km) (Iridium tipped plugs)

Transmission Fluid Change:

Every 60,000 miles (96,000 km) (or more frequently under severe service)

Brake Fluid Flush:

Every 2 years, regardless of mileage

Coolant Type:

Mercedes-Benz Approved Antifreeze (e.g., ZEREX G-05 or equivalent)

Brake Fluid Type:

DOT 4 Plus (e.g., Pentosin DOT 4 LV)

Power Steering Fluid Type:

Pentosin CHF 11S or equivalent

Clutch Fluid Type:

N/A (Automatic Transmission)

Known Issues:

Vario-Roof hydraulic system leaks/failures, Mass Air Flow (MAF) sensor issues, Ignition coil failures, Oil leaks from valve cover gaskets and oil pan seals, Rust on wheel arches and rocker panels, Electronic control module (ECM) issues.

Maintenance Schedule Notes:

Refer to the manual for specific conditions that may require more frequent service (e.g., driving in dusty conditions, frequent short trips, heavy towing).

📚 Vehicle History

Brand Heritage:

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

Model Evolution:

The R170 SLK class was introduced in 1996 as a compact roadster. The SLK230 Kompressor (supercharged) was a popular variant, offering spirited performance. The 2003 model year falls into the latter part of the R170 generation, which was facelifted in 2000.

Facelift Impact:

The 2003 model benefits from the 2000 facelift which included updated bumpers, headlights, taillights, interior trim, and improved engine management.

Production Location:

Bremen, Germany

Production Years R170:

1996-2004

🏆 Awards & Recognition

Recognitions:

While specific awards for the 2003 SLK230 are not widely publicized, the R170 generation was generally well-received for its styling and innovative Vario-Roof. It contributed to Mercedes-Benz's reputation in the sports car segment.