Engine Systems:
Engine mechanicals, fuel injection, ignition, cooling, lubrication, exhaust, emissions control, engine management (ECU).
Transmission Systems:
Automatic transmission (e.g., 7G-TRONIC PLUS), torque converter, mechatronics, gear shifting logic, transmission control module (TCM).
Drivetrain Systems:
Driveshaft, differentials, axles, wheel bearings.
Suspension Systems:
Active Body Control (ABC) / AIRMATIC suspension, shock absorbers, springs, control arms, anti-roll bars, power steering.
Braking Systems:
Hydraulic braking system, ABS, ESP (Electronic Stability Program), brake discs, pads, calipers, brake lines, parking brake.
Steering Systems:
Power steering system (electro-hydraulic or hydraulic), steering column, steering rack, steering angle sensor.
Electrical Systems:
Battery, charging system, starter motor, lighting (headlights, taillights, interior), fuses, relays, wiring diagrams.
Body And Chassis:
Body panels, doors, hood, trunk, interior trim, chassis components, corrosion protection.
HVAC Systems:
Automatic climate control, air conditioning, heating, ventilation, blower motor, evaporator, condenser, refrigerant system.
Infotainment And Comfort:
COMAND infotainment system, navigation, audio system, seat adjustment and memory, power windows, sunroof, mirrors.
Safety Systems:
Airbags, seatbelts, ABS, ESP, ADAPTIVE BRAKE, PARKTRONIC, DISTRONIC PLUS, LANE KEEPING ASSIST, BLIND SPOT ASSIST.
Maintenance Procedures:
Oil change, filter replacements (oil, air, cabin, fuel), fluid checks and changes (coolant, brake fluid, power steering fluid, transmission fluid), spark plug replacement, brake pad and rotor replacement.
Diagnostic Procedures:
Troubleshooting guides, fault code interpretation, diagnostic tool usage (e.g., STAR Diagnosis/XENTRY), electrical system diagnostics.
Repair Procedures:
Component removal and installation (engine, transmission, suspension, brakes, steering, electrical components, body panels), engine overhaul, transmission overhaul.
Calibration And Adjustment:
Sensor calibration (e.g., steering angle sensor, ride height sensors), electronic system initialization, alignment procedures.
Technical Specifications:
Torque specifications for all fasteners, diagnostic trouble codes (DTCs) and their meanings, repair times (flat rates).
Depth Of Coverage:
Factory-level detail, covering everything from routine maintenance to complex system diagnostics and major component overhauls.
Diagnostics:
In-depth diagnostic strategies, including symptom-based troubleshooting and wiring diagrams for electrical systems.
Repair Instructions:
Step-by-step instructions with accompanying diagrams and illustrations for all repair procedures.
Component Identification:
Detailed identification of all parts and components with part numbers where applicable.
Infotainment System:
COMAND (Cockpit Management and Navigation) APS system with integrated navigation, radio, CD/DVD changer, Bluetooth connectivity, and optional Harman Kardon surround sound.
Adas Features:
Adaptive Cruise Control (DISTRONIC PLUS), Lane Keeping Assist, Blind Spot Assist, Active Bi-Xenon Headlights, Night View Assist Plus, Parking Assist (PARKTRONIC).
Connectivity Options:
Bluetooth for hands-free calling and audio streaming, optional media interface for iPod/USB integration.
Comfort And Convenience:
Multi-contour seats with heating, ventilation, and massage functions, keyless-go, soft-close doors, power trunk lid.
Oil Change Interval:
Typically every 10,000 miles or 12 months, whichever comes first (subject to driving conditions and specific model variant).
Major Service Intervals:
Scheduled maintenance every 30,000-60,000 miles (e.g., spark plugs, transmission fluid change, coolant flush, brake fluid change).
Engine Oil Specification:
MB 229.5 or MB 229.51 (full synthetic, viscosity typically 0W-40 or 5W-40 depending on engine).
Coolant Specification:
MB 325.0 (Antifreeze)
Brake Fluid Specification:
DOT 4 Plus (MB 331.0)
Common Wear Items:
Air suspension components (struts, compressor), ABC hydraulic lines, ignition coils, fuel injectors, serpentine belts, brake wear.
Electrical Gremlins:
Can occur due to complex electronics; often related to module failures or wiring harness issues.
Sbc Recall For Older Models:
Note: While the 2011 model typically features updated systems, earlier W221 models had a recall for the Sensotronic Brake Control (SBC).
