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 GLB250 BaseFACTORY OEM SERVICE PROCEDURE
Electrical System - Engine - 247 Chassis
- General Information
- Basic Knowledge
- Testing & Repair
- Remove Install Crankshaft Pulse Ring - AR15.12-P-0001MFC
- Remove/Install Ignition Coils - AR15.12-P-2003MFC
- Remove/Install Crankshaft Hall Sensor - AR15.12-P-2136MFC
- Remove/Install Knock Sensors - AR15.12-P-2184MFC
- Disconnect/Connect Engine Wiring Harness To Remove Cylinder Head Cover - AR15.18-P-1000-04MFC
- Remove/Install Starter - AR15.30-P-7100MFC
- Tighten Alternator Screws/Bolts - AR15.40-P-0002-01MFA
- Check Regulator And Alternator - AR15.40-P-5000MFC
- Test Alternator Charging Current - AR15.40-P-5011MFD
- Remove/Install Alternator - AR15.40-P-5032MFC
- Remove/Install Alternator Belt Pulley - AR15.40-P-5710MFC
- Test Alternator Diodes - AR15.40-P-9301-02MFD
- Remove/Install Coolant Temperature Sensor - AR15.60-P-2712MFC
- Test & Adjustment Values
- Maintenance
- Torque Specifications
- Tightening Torques: Passenger Cars: Electrical System - Engine - BA15.00-Z-9999AZ
- Ignition System - BA15.10-P-1000-01C
- Knock Sensors - BA15.10-P-1000-02B
- Position Sensor - BA15.10-P-1000-03I
- Ignition Coil - BA15.10-P-1000-04A
- Starter - BA15.30-P-1000-01J
- Generator - BA15.40-P-1000-01W
- Temperature Sensor - BA15.60-P-1000-01E
- Forms
- Wiring Diagrams
- Special Tools
Factory Service Tools
Use the Manual With the Right Hardware
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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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