Description
Side impact sensor for airbag for Citroën and Peugeot vehicles
This Autoliv side impact sensor is a direct-fit safety component designed for Citroën and Peugeot models. Ideal for professional workshops and experienced DIY mechanics, the sensor restores proper lateral-impact detection for the airbag system and helps clear crash-related faults. The part is commonly searched by its product numbers 9666370880, 618293300 and 8217F6 — enter these codes when looking for exact fitment.
Function And Application
The side impact sensor measures lateral acceleration and transmits the signal to the airbag control unit. In the event of a side collision the sensor triggers deployment algorithms for side and curtain airbags, optimizing occupant protection. It works as part of the vehicle’s supplemental restraint system and must communicate reliably with the airbag ECU to ensure correct timing and deployment decisions.
Fitment And Compatible Models
Typical applications include Citroën C3 Picasso, Citroën C5 X7 and Peugeot 308. Use the product codes when searching to ensure compatibility with the specific model and production variant — many technicians locate this sensor by its OE numbers.
How To Replace
- Disconnect the vehicle battery before starting work to avoid accidental airbag deployment and electrical damage.
- Remove the interior trim panels or door sill covers required to access the sensor location — sensors are often mounted in the B-pillar, door or seat area depending on model.
- Unplug the electrical connector and remove the fixing bolt(s). Retain any spacers or plates for correct reinstallation.
- Install the new sensor in the same orientation as the original. Do not rotate the sensor relative to its mounting face; correct orientation is critical for accurate lateral measurement.
- Reconnect the electrical connector, refit trim, reconnect the battery and clear airbag fault codes with a suitable diagnostic tool to verify system status.
Replacement Interval And Common Failure Causes
There is no fixed mileage interval for side impact sensors; replacement is usually prompted by collision damage, persistent airbag fault codes, or visible connector/corrosion issues. Common causes of failure are previous impacts, water ingress or corrosion at the connector, mechanical shock beyond design limits, and wiring damage from interior work or rust. Symptoms include airbag warning light, stored crash codes or permanent fault states in the SRS system.
Technical Information
- Manufacturer: Autoliv
- Model: Citroën C3 Picasso; Citroën C5 X7; Peugeot 308
- Product Codes: 9666370880; 618293300; 8217F6
- Other Numbers: 9666370880 / 618293300 / 8217F6
Installation Recommendations
- Always disconnect the battery before removal and follow the vehicle manufacturer’s procedures to prevent damage or accidental deployment.
- Keep the sensor in the same mounting orientation and torque fasteners to manufacturer specifications where available.
- After installation use a diagnostic scanner to clear SRS fault codes and confirm that the airbag warning lamp is extinguished and no persistent errors remain.
- Handle the sensor and connector with care to avoid contamination; protect exposed contacts from dirt and moisture during installation.
Why This Part Fails Most Often
Side impact sensors are frequently damaged in collisions, even minor ones, because they are designed to register and survive crash events. Corrosion and water ingress at the connector or mounting area are common degradation mechanisms, particularly in vehicles exposed to road salt or leaks. Improper handling during interior repairs or accidental impacts during jacking and towing can also impair sensor function.
