Antenna Amplifier / Radio Signal Amplifier and DAB Module – 4N0035500

Original electronic antenna signal amplifier (module for separating and amplifying FM/AM radio waves, DAB digital radio, and central locking remote control signals), designed for Audi A7 Sportback, S7 and RS7 (4K / 4K8 generation) and Audi A6 C8 (type 4K2 / 4K5 / 4KA) models produced from 2018 to 2026, including versions with 3.0 V6 TFSI (55 TFSI), 2.0 TFSI (40/45 TFSI), TDI diesel engines, and S and RS variants based on the modular MLBevo longitudinal platform.

Original electronic component for VAG group telematics systems. Installed in the rear bodywork area (in close proximity to the antenna leads embedded in the tailgate glass or C-pillar). It is responsible for actively filtering interference, stabilizing, and amplifying the radio signal received by the antennas in the glass before transmitting it to the MMI main unit. It prevents radio signal loss, noise during highway driving, and ensures a stable range for the central locking remote control and keyless access system (Keyless-Go / Advanced Key).

Technical specifications:

• Catalog part number (OE): 4N0035500 / 4N0 035 500 (interchangeable with revisions in the 4N0035500A, 4N0035500B, 4N0035500C series)

• System / Category: Electrical installation and multimedia / Antenna amplifiers, signal filters and tuners (Antenna Amplifier / Aerial Signal Booster Module)

• Function: Antenna signal amplifier for radio, digital radio and key fobs

• Supported bands: FM / AM, DAB/DAB+ digital radio, and central locking remote control frequencies

• Connectors: Original FAKRA concentric connectors (OEM VAG color-coded) + power / ground connector

• Installation location: Rear of the vehicle – under the tailgate trim or in the rear pillar panel

• Dedicated model: Audi A7 Sportback / S7 / RS7 (type 4K8) and Audi A6 / Avant / Allroad (type 4K / C8)

• Steering wheel side: Left (LHD) and Right (RHD) – universal component

• Condition: Original used part (100% functional – electronics tested, FAKRA pins and sockets intact, no signs of short circuits, spills or moisture, housing undamaged)

• Manufacturer: Audi AG / VAG (OEM Original)

Main application:

• Audi:

  • A7 Sportback (type 4K8) – model years 2018 to 2026 (all engine and MMI equipment versions)

  • S7 Sportback (type 4K8) – model years 2019 to 2026

  • RS7 Sportback (type 4K8) – model years 2019 to 2026

  • A6 / A6 Avant / Allroad (type 4K2 / 4K5 / 4KA - C8) – model years 2018 to 2026

  • S6 / RS6 Avant (type 4K - C8) – model years 2019 to 2026

Fitment guarantee and VIN verification

Each amplifier module undergoes verification to ensure no signs of contact oxidation and a mechanical inspection of the concentric sockets before shipping.

Fitment / installation tip: The initial designation 4N0 (multimedia group 035) belongs to the latest generation of telematics modules on the MLBevo platform. Amplifier failure is most often indicated by a sudden deterioration in radio station reception (crackling, DAB station dropouts), antenna signal missing messages in computer diagnostics, or a drastic reduction in the range of the car key fob. Using the original OEM module eliminates interference and does not require removing the component protection. Before purchasing, we recommend comparing the OE number on the sticker on the part housing or verifying fitment using the vehicle's VIN.