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September 12, 2023 Service bulletin

Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 – Positive Crankcase...

Mercedes-Benz technical service bulletin LI01.20-P-076894 for 2015-2018 Mercedes-Benz C300, 2016-2019 Mercedes-Benz GLC 300 and 2016-2018 Mercedes-Benz E300 and others.

Bulletin number
LI01.20-P-076894
Component
Engine and engine cooling: exhaust system: emission control: crankcase (PCV)
Summary
Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 – Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase ventilation has a malfunction The partial-load ventilation valve (a part of the intake line assembly) may not work as intended Performed guided test for fault code P052E71. Replace intake line assembly if necessary per results of the guided test. Do not perform software update of N3/10 Engine control unit at this time. This LI will be updated once the software solution is available. This LI is in relation to NCU dated 8/31/2023 "Emission Extended Warranty – Intake Line Assembly".

Owners of these vehicles have filed 525 complaints in the engine category.

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