Description
Side impact sensor for airbag for CITROËN and PEUGEOT vehicles.
This side impact (lateral acceleration) sensor is designed for Citroën and Peugeot airbag systems and is referenced under OE numbers 9665730180 and 8217G3. It provides reliable detection of lateral forces to trigger side and curtain airbags in case of a collision. Commonly searched by product codes 9665730180 and 8217G3, this sensor is a direct-fit replacement for a range of Stellantis models and is aimed at professional mechanics and DIY technicians performing safety system repairs.
Technical Information
- Manufacturer: Stellantis
- Model: Citroën C4 II, DS4, Peugeot 508
- Product Codes: 9665730180, 8217G3
- Additional Numbers: 8217G3
Fitment And Compatibility
Intended for use on selected Citroën and Peugeot models, including Citroën C4 II, DS4 and Peugeot 508. Compatibility is often confirmed by the OEM part number (9665730180 / 8217G3). Always compare the physical connector and mounting position with the original part before installation.
Function
The sensor measures lateral acceleration and impact forces and sends a signal to the airbag control module to determine whether side or curtain airbags should be deployed. Accurate and fast detection is critical for occupant protection during side collisions.
Replacement Procedure
- Disconnect the vehicle battery and wait the manufacturer-recommended time to avoid accidental airbag deployment.
- Remove interior trim panels or door trims to access the sensor (location varies by model: commonly found in the door, B-pillar area, or seat mount).
- Unplug the electrical connector and unbolt the sensor from its bracket.
- Install the replacement sensor in the exact mounting orientation; torque fasteners to manufacturer specifications.
- Reconnect the connector and reassemble trim. Reconnect the battery and clear any diagnostic codes with an appropriate diagnostic tool.
Installation Recommendations
- Always disconnect the battery before starting work and follow manufacturer safety procedures to prevent accidental airbag deployment.
- Handle the sensor and connector carefully—do not drop the sensor or damage the mounting bracket.
- Maintain correct sensor orientation and secure mounting; incorrect positioning can prevent proper activation.
- After fitting, use a diagnostic scanner to reset airbag fault codes and verify system status. If airbag warnings persist, recheck connections and mounting.
- Use only original-equivalent fasteners and avoid overtightening to prevent sensor damage.
Why This Part Most Commonly Fails
Side impact sensors can fail or become unreliable for several reasons: physical damage from previous collisions, corrosion or water ingress into connectors, wiring harness damage, or mechanical loosening of the mounting. After any deployment or significant side-impact event the sensor should be inspected and typically replaced, as its accuracy and safety function may be compromised.
