DC-DC Voltage Converter / 48V System Voltage Regulator (Mild Hybrid) – 4K0959663
Original DC/DC voltage converter (48V/12V hybrid system converter / voltage regulator), designed for Audi A7 Sportback (4K / 4K8 generation), Audi A6 (C8 / 4K), Audi A8 (D5 / 4N), Q7 (4M Lift) and Q8 (4MN) vehicles.
Factory power electronics module for the mild hybrid system (Mild Hybrid MHEV). It is responsible for bidirectional voltage conversion and stabilization between the main 12V onboard network and the 48V lithium-ion battery, ensuring proper power supply to accessories, the integrated alternator (BSG), and onboard systems.
Technical specifications:
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Catalog part number (OE):
4K0959663/4K0 959 663(also available under series numbers4M0959663/4M0959663C) -
Function: DC-DC converter / 48V / 12V voltage regulator and stabilizer (MHEV)
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Mounting side: Trunk / battery compartment / chassis (depending on the model)
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Steering wheel side: Left (LHD – European version)
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Condition: Original used part (100% electronically functional, pins and power terminals clean and straight, housing sealed without signs of moisture or overheating)
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Manufacturer: Audi / VAG (OEM original)
Main application:
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Audi:
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A7 Sportback (4K8) – model years 2018 to 2024 (3.0 TFSI / 55 TFSI, 3.0 TDI / 50 TDI MHEV engines)
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A6 Saloon / Avant / Allroad (C8 / 4K) – model years 2018 to 2024
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A8 / S8 (D5 / 4N) – model years 2017 to 2024
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Q7 / SQ7 (4M Lift) – model years 2019 to 2024
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Q8 / SQ8 (4MN / 4M8) – model years 2018 to 2024
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A4 B9 / A5 F5 / Q5 FY – selected versions with 48V Mild Hybrid system
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Fitment guarantee and VIN verification
Each converter undergoes diagnostics to check for proper communication with the 48V battery control unit, absence of internal faults, and functionality of high-current connectors.
Fitment advice: 48V power modules are selected strictly according to the OE number. Before purchase, we recommend comparing the designation with your old converter or verifying fitment using the vehicle's VIN.