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April 3, 2025 Service bulletin

Check engine light illuminated

Mercedes-Benz technical service bulletin LI01.20-N-079115_1 for 2019-2023 Mercedes-Benz Sprinter 2500, 2019-2023 Mercedes-Benz Sprinter 3500 and 2015-2023 Mercedes-Benz Metris and others.

Bulletin number
LI01.20-N-079115_1
Component
Engine
Summary
Check engine light illuminated - Fault code current P04D-B79 The crankcase ventilation system is interrupted. Complaint: Check engine light on. Fault code P04DB79 is current in the engine control module (N3/10). Cause: Open circuit or high resistance to crankcase vent line contact Remedy 1. Check the electrical connector for S208 vent line contact switch. Refer to attached photo of connection location. 2. Ensure the bolted connection is secure and bolt can be torqued (9Nm). 3. Check continuity from vent line connection to ME control unit. Repair wire if damage is found.

Owners of these vehicles have filed 79 complaints in the engine category.

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