Description
Side impact sensor for the airbag system for Citroën and Peugeot vehicles.
High-quality side impact sensor supplied by Autoliv, compatible with a range of Citroën and Peugeot models. This sensor (OE references 9666370880, 618293300, 8217F6) detects lateral acceleration and transmits the signal to the airbag control unit to ensure timely deployment of side airbags in the event of a collision. Designed as a direct-fit replacement for workshop repairs and DIY servicing, the sensor restores correct crash detection and fault-free communication with the airbag system when installed correctly.
Technical Information
- Manufacturer: Autoliv (used by Stellantis OEM applications)
- Model: Side Impact Sensor
- Product Codes: 9666370880, 618293300, 8217F6
- Other Numbers: 8217.F6
Fitment
Typical fitment includes various Citroën and Peugeot models such as Citroën C3 II, Citroën C3 Picasso, Citroën C5 X7 and Peugeot 308. Always confirm the part number against the vehicle’s existing sensor before installation.
Function And Application
The side impact sensor monitors lateral acceleration and impact forces at the vehicle sides. When a threshold is exceeded, the sensor sends a signal to the airbag control module to trigger side airbag and curtain deployment. Reliable sensor operation is critical for occupant protection and for preventing false deployments or system faults.
How The Sensor Is Replaced
- Disconnect the vehicle battery and wait the manufacturer-recommended time to prevent accidental airbag deployment and avoid electrical damage.
- Access the sensor location—commonly mounted in the B-pillar, door frame, or seat base—by removing interior trim panels.
- Unplug the electrical connector, remove mounting bolts, and replace the old sensor with the new unit. Transfer any mounting brackets if required.
- Reconnect the connector, reassemble trim, reconnect the battery and perform an airbag system check with a diagnostic tool to clear fault codes and verify communication.
Installation Recommendations
- Always disconnect the battery before starting work and follow manufacturer safety procedures to avoid personal injury or damage to the SRS system.
- Handle the sensor and connector carefully—avoid impacts, contamination, or pulling on wires.
- Ensure secure mechanical mounting and clean electrical contacts. Replace any damaged clips or connectors.
- After installation, use an appropriate diagnostic scanner to verify the airbag control unit recognizes the sensor and to clear any stored diagnostic trouble codes.
Common Causes Of Failure
- Physical Damage From Collision: Sensors are often damaged in side impacts or door collisions and require replacement after any significant accident.
- Water Ingress And Corrosion: Moisture entering through seals or damaged bodywork can corrode connectors or sensor internals, causing intermittent faults.
- Connector Or Wiring Damage: Chafed or loose wiring and oxidized connectors interrupt the communication between the sensor and airbag control unit.
- Age And Environmental Stress: Long-term vibration, temperature cycles and contaminants can degrade the sensor electronics over time.
Buying the correct side impact sensor by OE number (9666370880 / 618293300 / 8217F6) helps ensure direct fitment and reliable airbag system performance. Ideal for professional workshops and experienced DIYers performing safety-related repairs.
