Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
External Pages
's manual. Be very cautious using repair info from here because these pages may not apply to your vehicle. Different car Section 1 (Cabin Air Filter) Section 2 (Engine Timing -- C63 (204)) Section 3 (Exhaust Manifolds, Emission Control -- C63 (204)) Section 4 (Electrical System - Engine -- C63 (204)) Section 5 (Engine Cooling System -- C63 (204)) Section 6 (Complete Engine -- C63 (204)) Section 7 (Crank Assembly -- C63 (204)) Section 8 (Air Intake -- C63 (204)) Section 9 (Lubrication, Oil Cooling -- C63 (204)) Section 10 (Fasteners & Wiring Harness Repair -- General Information -- C300 4MATIC (204.081)) Section 11 (Complete Engine -- C300 4MATIC (204.081)) Section 12 (Engine Timing -- C300 4MATIC (204.081)) Section 13 (Air Intake System -- C300 4MATIC (204.081)) Section 14 (Exhaust Manifolds, Emission Control -- C300 4MATIC (204.081)) Section 15 (Electrical System - Engine -- C300 4MATIC (204.081)) Section 16 (Lubrication, Oil Cooling -- C300 4MATIC (204.081)) Section 17 (Engine Cooling System -- C300 4MATIC (204.081)) Section 18 (Engine Suspension -- C300 4MATIC (204.081)) Section 19 (Throttle Control, Speed Control Systems -- C300 4MATIC (204.081)) Section 20 (Fuel System -- C300 4MATIC (204.081)) Section 21 (Exhaust System -- C300 4MATIC (204.081)) Section 22 (Frame, Trailer Operation -- C300 4MATIC (204.081)) Section 23 (Suspension -- C300 4MATIC (204.081)) Section 24 (Rear Axle -- C300 4MATIC (204.081)) Section 25 (Wheels, Chassis Alignment Check -- C300 4MATIC (204.081)) Section 26 (Brakes -- C300 4MATIC (204.081)) Section 27 (Brakes - Pneumatic System -- C300 4MATIC (204.081)) Section 28 (Steering -- C300 4MATIC (204.081)) Section 29 (Electrical System -- General Information -- C300 4MATIC (204.081)) Section 30 (Body (204.081)) Section 31 (Front End & Fire Wall (204.081)) Section 32 (Side Wall (204.081)) Section 33 (Rear Wall & Rear End (204.081)) Section 34 (Roof (204.081)) Section 35 (Windows -- C300 4MATIC (204.081)) Section 36 (Interior Equipment -- C300 4MATIC (204.081)) Section 37 (Doors & Windows -- C300 4MATIC (204.081)) Section 38 (Sliding Roof, Soft Top -- C300 4MATIC (204.081)) Section 39 (Anti-Theft & Central Locking System -- C300 4MATIC (204.081)) Section 40 (Lighting & Wiper/Washer -- General Information -- C300 4MATIC (204.081)) Section 41 (Climate Control -- C300 4MATIC (204.081)) Section 42 (Emergency Equipment -- C300 4MATIC (204.081)) Section 43 (Detachable Body Components -- C300 4MATIC (204.081)) Section 44 (Seats, Restraint Systems -- C300 4MATIC (204.081)) Section 45 (Body Sealing, Corrosion Protection -- C300 4MATIC (204.081)) Section 46 (Paintwork -- C300 4MATIC (204.081)) Section 47 (OEM User Information -- C300 4MATIC (204.081)) Section 48 (Overall Vehicle -- OEM Wiring Diagrams -- C300 4MATIC (204.081)) Section 49 (Electrical System -- OEM Wiring Diagrams -- C300 4MATIC (204.081)) Section 50 (Collision Avoidance, Entertainment, Lighting, Wiper/Washer -- OEM Wiring Diagrams -- C300 4MATIC (204.081)) Section 51 (Mixture Formation -- OEM Wiring Diagrams -- C300 4MATIC (204.081)) Section 52 (SAM Control Unit & Electrical System -- OEM Wiring Diagrams -- C300 4MATIC (204.081)) Section 53 (Automatic Transmission -- OEM Wiring Diagrams -- C300 4MATIC (204.081)) Section 54 (Active Service System (ASSYST), Connectors & Network -- C300 4MATIC (204.081) -- 1 Of 2) Section 55 (Active Service System (ASSYST), Connectors & Network -- C300 4MATIC (204.081) -- 2 Of 2) Section 56 (Mixture Formation -- Basic Knowledge -- C300 4MATIC (204.081)) Section 57 (Transfer Case -- C300 4MATIC (204.081)) Section 58 (Electrical System -- Basic Knowledge -- C300 4MATIC (204.081)) Section 59 (Entertainment, Navigation, Lighting, & Wiper/Washer -- Basic Knowledge -- C300 4MATIC (204.081)) Section 60 (COMAND, Entertainment & Navigation -- Basic Knowledge -- C300 4MATIC (204.081)) Section 61 (Automatic Transmission -- Basic Knowledge -- C300 4MATIC (204.081)) Section 62 (Overall Vehicle -- Testing & Repair -- C300 4MATIC (204.081)) Section 63 (Overall Vehicle -- Safety Precautions -- C300 4MATIC (204.081)) Section 64 (Tools -- C300 4MATIC (204.081)) Section 65 (Pedal Assembly -- C300 4MATIC (204.081)) Section 66 (Electrical System, Equipment & Instructions -- Safety Precautions -- C300 4MATIC (204.081)) Section 67 (Electrical System -- Safety Precautions -- C300 4MATIC (204.081)) Section 68 (Star Diagnosis -- Self-Diagnostic System -- C300 4MATIC (204.081)) Section 69 (Front Axle -- C300 4MATIC (204.081)) Section 70 (Electrical System -- Testing & Repair -- C300 4MATIC (204.081)) Section 71 (Entertainment, Lighting & Wiper/Washer -- Testing And Repair -- C300 4MATIC (204.081)) Section 72 (Mixture Formation -- Testing & Repair -- C300 4MATIC (204.081)) Section 73 (Propeller Shaft -- C300 4MATIC (204.081)) Section 74 (Substructure -- C300 4MATIC (204.081)) Section 75 (Body Noises, Noise Insulation -- C300 4MATIC (204.081)) Section 76 (Crank Assembly -- C300 4MATIC (204.081)) Section 77 (Air Compressor, Belt Drives -- C300 4MATIC (204.081)) Section 78 (Automatic Transmission -- Testing And Repair -- C300 4MATIC (204.081)) Section 79 (Automatic Transmission -- Capacities & Specifications -- C300 4MATIC (204.081)) Section 80 (Overall Vehicle -- Capacities And Specifications -- C300 4MATIC (204.081) -- 1 Of 2) Section 81 (Overall Vehicle -- Capacities And Specifications -- C300 4MATIC (204.081) -- 2 Of 2) Section 82 (Passenger Car Delivery Inspection Forms -- C300 4MATIC (204.081)) Section 83 (Overall Vehicle -- Special Tools -- C300 4MATIC (204.081) -- 2 Of 2) Section 84 (Electrical System, Equipment & Instructions -- Special Tools -- C300 4MATIC (204.081)) Section 85 (Automatic Transmission -- Special Tools -- C300 4MATIC (204.081)) Section 86 (Overall Vehicle -- Special Tools -- C300 4MATIC (204.081) -- 1 Of 2) Section 87 (Mixture Formation -- Special Tools -- C300 4MATIC (204.081)) Section 88 (Electrical System -- Special Tools -- C300 4MATIC (204.081)) Section 89 (Lighting & Wiper/Washer -- Maintenance -- C300 4MATIC (204.081)) Section 90 (Battery Disposal -- C300 4MATIC (204.081)) Section 91 (Shift Paddle Coupling Housing -- Component Modifications -- C300 4MATIC (204.081)) Section 92 (Special Engine Equipment -- C300 4MATIC (204.081)) Section 93 (Fasteners & Wiring Harness Repair -- General Information -- C300 (204.054)) Section 94 (OEM User Information -- C300 (204.054)) Section 95 (Mixture Formation -- OEM Wiring Diagrams -- C300 (204.054)) Section 96 (Brakes -- C300 (204.054)) Section 97 (Suspension -- C300 (204.054)) Section 98 (Seats, Restraint Systems -- OEM Wiring Diagrams -- C300 (204.054)) Section 99 (Frame, Trailer Operation -- C300 (204.054)) Section 100 (Overall Vehicle -- OEM Wiring Diagrams -- C300 (204.054)) Section 101 (Electrical System -- OEM Wiring Diagrams -- C300 (204.054) - 1 Of 2) Section 102 (Electrical System -- OEM Wiring Diagrams -- C300 (204.054) - 2 Of 2) Section 103 (SAM Control Unit & Electrical System -- OEM Wiring Diagrams -- C300 (204.054) - 1 Of 2) Section 104 (SAM Control Unit & Electrical System -- OEM Wiring Diagrams -- C300 (204.054) - 2 Of 2) Section 105 (Throttle Control, Speed Control Systems -- C300 (204.054)) Section 106 (Automatic Transmission -- OEM Wiring Diagrams -- C300 (204.054)) Section 107 (Doors & Windows -- C300 (204.054)) Section 108 (Anti-Theft & Central Locking System -- C300 (204.054)) Section 109 (Climate Control -- C300 (204.054)) Section 110 (Fuel System -- C300 (204.054)) Section 111 (Steering -- C300 (204.054)) Section 112 (Sliding Roof, Soft Top -- C300 (204.054)) Section 113 (Wheels, Chassis A
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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