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.
2021 Mercedes Benz CLS53 AMGFACTORY OEM SERVICE PROCEDURE
Repair and Diagnosis
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Quick Lookups
- Accessories & Equipment
- Accessories Control Systems
- Electrical System - Body - 257 Chassis 1 Of 8
- Electrical System - Body - 257 Chassis 2 Of 8
- Electrical System - Body - 257 Chassis 3 Of 8
- Electrical System - Body - 257 Chassis 4 Of 8
- Electrical System - Body - 257 Chassis 5 Of 8
- Electrical System - Body - 257 Chassis 6 Of 8
- Electrical System - Body - 257 Chassis 7 Of 8
- Electrical System - Body - 257 Chassis 8 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 1 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 2 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 4 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 5 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 6 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 7 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 8 Of 8
- Anti-Theft Systems
- Collision/Avoidance
- Electrical System, Equipment & Instruments - 257 Chassis 1 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 2 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 4 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 5 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 6 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 7 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 8 Of 8
- Throttle Control, Speed Control Systems - 257 Chassis
- Tools - 257 Chassis
- Communication Devices
- Electrical System, Equipment & Instruments - 257 Chassis 1 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 2 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 4 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 5 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 6 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 7 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 8 Of 8
- Cruise Control Systems
- Drivers Assistance Systems - ADAS
- Electrical System, Equipment & Instruments - 257 Chassis 1 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 2 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 4 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 5 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 6 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 7 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 8 Of 8
- Throttle Control, Speed Control Systems - 257 Chassis
- Tools - 257 Chassis
- Exterior Lights
- Electrical System - Body - 257 Chassis 1 Of 8
- Electrical System - Body - 257 Chassis 2 Of 8
- Electrical System - Body - 257 Chassis 3 Of 8
- Electrical System - Body - 257 Chassis 4 Of 8
- Electrical System - Body - 257 Chassis 5 Of 8
- Electrical System - Body - 257 Chassis 6 Of 8
- Electrical System - Body - 257 Chassis 7 Of 8
- Electrical System - Body - 257 Chassis 8 Of 8
- Gauges & Instrument Panels
- Electrical System, Equipment & Instruments - 257 Chassis 1 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 2 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 4 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 5 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 6 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 7 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 8 Of 8
- Headlights
- Electrical System - Body - 257 Chassis 1 Of 8
- Electrical System - Body - 257 Chassis 2 Of 8
- Electrical System - Body - 257 Chassis 3 Of 8
- Electrical System - Body - 257 Chassis 4 Of 8
- Electrical System - Body - 257 Chassis 5 Of 8
- Electrical System - Body - 257 Chassis 6 Of 8
- Electrical System - Body - 257 Chassis 7 Of 8
- Electrical System - Body - 257 Chassis 8 Of 8
- Infotainment
- Interior/Exterior Trim
- Interior/Illumination Lights
- Electrical System - Body - 257 Chassis 1 Of 8
- Electrical System - Body - 257 Chassis 2 Of 8
- Electrical System - Body - 257 Chassis 3 Of 8
- Electrical System - Body - 257 Chassis 4 Of 8
- Electrical System - Body - 257 Chassis 5 Of 8
- Electrical System - Body - 257 Chassis 6 Of 8
- Electrical System - Body - 257 Chassis 7 Of 8
- Electrical System - Body - 257 Chassis 8 Of 8
- Mirrors
- Seats
- Window Motors & Regulators
- Wiper/Washer Systems
- Electrical System - Body - 257 Chassis 1 Of 8
- Electrical System - Body - 257 Chassis 2 Of 8
- Electrical System - Body - 257 Chassis 3 Of 8
- Electrical System - Body - 257 Chassis 4 Of 8
- Electrical System - Body - 257 Chassis 5 Of 8
- Electrical System - Body - 257 Chassis 6 Of 8
- Electrical System - Body - 257 Chassis 7 Of 8
- Electrical System - Body - 257 Chassis 8 Of 8
- Accessories Control Systems
- Body & Frame
- Brakes
- Collision
- Drivelines & Axles
- Electrical
- Body Electrical
- Electrical Drive System - 257 Chassis
- Electrical System - Body - 257 Chassis 1 Of 8
- Electrical System - Body - 257 Chassis 2 Of 8
- Electrical System - Body - 257 Chassis 3 Of 8
- Electrical System - Body - 257 Chassis 4 Of 8
- Electrical System - Body - 257 Chassis 5 Of 8
- Electrical System - Body - 257 Chassis 6 Of 8
- Electrical System - Body - 257 Chassis 7 Of 8
- Electrical System - Body - 257 Chassis 8 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 1 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 2 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 4 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 5 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 6 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 7 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 8 Of 8
- Fuel System - 257 Chassis
- Charging Systems
- Electrical Drive System - 257 Chassis
- Electrical System - Engine - 257 Chassis
- Electrical System, Equipment & Instruments - 257 Chassis 1 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 2 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 4 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 5 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 6 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 7 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 8 Of 8
- Gauges
- Electrical System, Equipment & Instruments - 257 Chassis 1 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 2 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 4 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 5 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 6 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 7 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 8 Of 8
- Motors, Switches, Relays
- Electrical Drive System - 257 Chassis
- Electrical System - Body - 257 Chassis 1 Of 8
- Electrical System - Body - 257 Chassis 2 Of 8
- Electrical System - Body - 257 Chassis 3 Of 8
- Electrical System - Body - 257 Chassis 4 Of 8
- Electrical System - Body - 257 Chassis 5 Of 8
- Electrical System - Body - 257 Chassis 6 Of 8
- Electrical System - Body - 257 Chassis 7 Of 8
- Electrical System - Body - 257 Chassis 8 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 1 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 2 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 3 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 4 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 5 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 6 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 7 Of 8
- Electrical System, Equipment & Instruments - 257 Chassis 8 Of 8
- Fuel System - 257 Chassis
- Starter
- Using lemon2025'S System Wiring Diagrams
- Body Electrical
- Engine Mechanical
- Engine Performance
- General Information
- Abbreviations
- Basic Trouble Shooting
- Brakes
- Check Lists
- Driveline/Axles
- DTC Index
- Electrical
- Engine
- Engine Performance
- Electrostatic Discharge Warning - General Information
- Engine Performance Diagnostic Routine Outline - General Information
- Engine Performance Safety Precautions
- Map - Engine Performance & Maintenance
- Parasitic Load Explanation & Test Procedures - General Information
- State Emission Standards - Diesel
- State Emission Standards - Gas
- Waveforms - Injector Pattern Tutorial - General Information
- Map - Exhaust Systems
- Heating, Ventilation & A/C (HVAC)
- Identification
- Metric Conversions
- OEM General Information
- Collision - Body - General
- Emergency Equipment, Disability Equipment, Sanitary Equipment, Galley - 257 Chassis
- Overall Vehicle - 257 Chassis 1 Of 8
- Overall Vehicle - 257 Chassis 2 Of 8
- Overall Vehicle - 257 Chassis 3 Of 8
- Overall Vehicle - 257 Chassis 4 Of 8
- Overall Vehicle - 257 Chassis 5 Of 8
- Overall Vehicle - 257 Chassis 6 Of 8
- Overall Vehicle - 257 Chassis 7 Of 8
- Overall Vehicle - 257 Chassis 8 Of 8
- Tools - 257 Chassis
- Specifications Index
- Steering
- Traction Control Disable Procedures
- Trouble Shooting - Manual Transmission - General Information
- Heating, Ventilation & A/C (HVAC)
- Restraints
- Steering
- Suspension
- Transmission
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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