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 G550FACTORY OEM SERVICE PROCEDURE
Electrical System - Engine - 463 Chassis
- General Information
- Safety Precautions
- Testing & Repair
- Remove/Install Ignition Coils - AR15.12-P-2003MNA
- Remove/Install Ignition Coils Of Left Cylinder Bank
- Remove/Install Ignition Coils Of Right Cylinder Bank
- Remove/Install Crankshaft Hall Sensor
- Remove/Install Position Sensors Of Camshafts - AR15.12-P-2144MNF
- Remove/Install Knock Sensors - AR15.12-P-2184MNF
- Remove/Install Left Front Knock Sensor
- Remove/Install Left Rear Knock Sensor
- Remove/Install Right Front Knock Sensor
- Remove/Install Right Rear Knock Sensor
- Disconnect/Connect Engine Wiring Harness To Remove Engine
- Disconnect/Connect Engine Wiring Harness To Remove Right Cylinder Head Cover
- Disconnect/Connect Engine Wiring Harness To Remove Left Cylinder Head Cover
- Disconnecting And Connecting Harness At Starter - AR15.30-P-7100-03MNA
- Remove/Install Starter
- Check Alternator
- Disconnect, Connect Wiring Harness At Alternator With Tie - AR15.40-P-5032-01MNA
- Remove/Install Alternator
- Remove/Install Alternator Belt Pulley - AR15.40-P-5710MNA
- Remove/Install Regulator For Alternator - AR15.40-P-5760MNA
- Remove/Install Coolant Temperature Sensor
- Test & Adjustment Values
- Maintenance
- Torque Specifications
- Tightening Torques: Cross-Country Vehicles: Electrical System - Engine - BA15.00-Z-9999BZ
- Ignition System - BA15.10-P-1000-01H
- Knock Sensors - BA15.10-P-1000-02G
- Position Sensor - BA15.10-P-1000-03M
- Ignition Coil - BA15.10-P-1000-04D
- Ground Strap - BA15.10-P-1000-05F
- Engine Wiring Harness - BA15.18-P-1000-01G
- Starter - BA15.30-P-1000-01T
- Generator - BA15.40-P-1000-01T
- Wiring Diagrams
- Special Tools
- 201 589 00 99 00 Electrical Connection Kit - WS15.00-N-0014C
- 124 589 09 63 00 Ohm Decade - WS15.00-P-0009C
- 602 589 00 10 00 Socket Wrench - WS15.00-P-0015B
- 177 589 00 63 00 Adapter Cable, 5-Pin - WS15.00-P-0023B
- 000 588 03 19 00 Load Tester - WS15.00-P-0027B
- 278 589 00 09 00 Spark Plug Wrench - WS15.00-P-0065B
Factory Service Tools
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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.