Airbag Crash Sensor / Impact Sensor – 4N0959651D

Original passive safety SRS Airbag system overload / impact sensor (external crash satellite for the front seat belt, side door, or pillar), designed for Audi A7 Sportback (4K / 4K8 generation) and Audi A6 C8 (4K2 / 4K5 / 4KA type), as well as related models (Audi A8 D5, Q7, Q8, e-tron) based on the MLBevo modular longitudinal platform.

Original VAG airbag system component (produced in cooperation with Continental). Equipped with a precise micro-mechanical silicon accelerometer (MEMS) that records sudden decelerations and bodywork deformation in real time. Housed in a sealed, moisture-, road salt-, and temperature-resistant plastic casing with an integrated metal sleeve for the mounting screw (ensuring ideal vibration transfer and no play), as well as a factory connector with a locking mechanism. It is responsible for immediately transmitting a digital collision signal to the main Airbag control unit, enabling the safe and error-free firing of pyrotechnic seat belt pretensioners and the respective airbags.

Technical specifications:

• Catalog part number (OE): 4N0959651D / 4N0 959 651 D (interchangeable with revisions from the 4N0959651, 4N0959651A, 4N0959651B, 4N0959651C series)

• System / Category: SRS / Airbag safety system (Passive Safety System / Airbag Crash Sensor)

• Function: Impact / crash acceleration sensor (Impact / Acceleration Sensor)

• Construction: Sealed composite housing with a factory steel sleeve for the screw, sealed 2-pin socket with a locking clip

• Mounting side: Front seat belt (front reinforcement) / B-pillar / side door – depending on the vehicle wiring harness configuration

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

• Condition: Original used part (100% functional, non-deployed – the sensor has never been involved in deploying airbags, no "crash data" post-accident data recorded, pins clean and straight, casing intact without cracks)

• Manufacturer: Audi AG / VAG / Continental (Original OEM)

Main application:

• Audi:

  • A7 Sportback (type 4K8) – model years 2018 to 2026 (all engine versions: 40 TDI, 45 TFSI, 50 TDI, 55 TFSI, S7, RS7)

  • 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

  • A8 / S8 (type 4N2 / 4N8 - D5) – model years 2017 to 2026

  • Q7 / SQ7 (type 4M / 4MB - post-facelift) – model years 2019 to 2026

  • Q8 / SQ8 / RS Q8 (type 4MN) – model years 2018 to 2026

  • e-tron / Q8 e-tron (type GE) – model years 2018 to 2026

• Volkswagen: Touareg III (type CR7)

• Porsche: Cayenne (type 9YA), Panamera (type 971)

Fitment guarantee and VIN verification

Every sensor undergoes diagnostic verification to ensure no crash data has been recorded, as well as a connector circuit continuity check before shipping.

Fitment / installation note: The initial 4N0 designation and 959 group indicate the electronic architecture of the new generation MLBevo platform. In SRS systems, the compatibility of the letter index (D) and the software/parameterization code is crucial – installing a sensor with incorrect characteristics will cause an Airbag control unit coding error on the dashboard. During installation, the battery must be disconnected and the factory mounting screw torque maintained to ensure proper seismic calibration of the sensor. Before purchasing, we recommend comparing the full OE number with the index on the old part's housing or verifying it using the vehicle's VIN.