This used side impact sensor, referenced by OEM numbers 9636982680, 8216H3 and 550903000, is a direct-fit component for a range of Citroën and Peugeot models. Designed for professional mechanics and experienced DIYers, the sensor detects lateral collisions and sends the signal to the airbag control unit to trigger side airbags and other occupant protection systems. Suitable for collision repair, replacement after airbag deployment or when side-impact diagnostics indicate a faulty sensor.

Key Benefits

Reliable replacement part that restores correct side-impact detection and airbag system functionality. Easy to integrate into original wiring harnesses on compatible vehicles. Using the correct OEM-referenced sensor helps avoid false triggers and ensures timely airbag deployment in the event of a side collision.

Compatibility

Commonly Found On:

• Citroën Berlingo
• Citroën C5
• Citroën Xsara
• Citroën Xsara Picasso
• Peugeot 206
• Peugeot 407
• Peugeot Partner

How The Part Works

The side impact sensor is an accelerometer/impact sensor that monitors lateral acceleration. When a threshold impact is detected, the sensor sends an electrical signal to the airbag control module, which evaluates inputs from all crash sensors and decides whether to deploy the side airbags and pre-tensioners. Correct placement, secure mounting and intact electrical connections are essential for dependable operation.

How To Replace

• Disconnect Battery: Always disconnect the vehicle battery and wait the manufacturer-recommended time before starting work to avoid accidental airbag deployment.
• Access Sensor: Remove interior trim panels (door card, B-pillar cover or seat trim depending on model) to reach the sensor mounting location.
• Disconnect Connector: Unplug the sensor’s electrical connector and release any retaining clips.
• Remove Sensor: Unscrew or unbolt the sensor from its bracket and take out the unit.
• Install New Sensor: Fit the replacement sensor in the original position, secure fasteners to the correct torque, and reconnect the electrical plug ensuring a firm contact.
• Reset And Test: Reconnect the battery. Use an appropriate diagnostic tool to clear fault codes and verify airbag system status. Perform a system self-check following the manufacturer’s procedure.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Side Impact Sensor
• Product Codes: 9636982680, 8216H3
• Additional Numbers: 550903000

Mounting Recommendations

• Always Disconnect The Battery Before Work And Follow Manufacturer Procedures To Prevent Damage Or Unintended Deployment.
• Use The Original Mounting Points And Torque Values Where Specified. Improper Mounting Or Loose Fasteners Can Affect Sensor Readings.
• Ensure Electrical Connectors Are Clean And Free Of Corrosion; Apply Contact Protection If Required.
• After Installation, Clear Airbag Fault Codes With A Suitable Diagnostic Tool And Confirm That The Airbag Warning Lamp Remains Off During Initial System Checks.

Reason Why Part Fails Most Often

Side impact sensors typically fail or require replacement after a collision when the sensor is mechanically damaged or when its internal calibration is affected. Other common causes include water ingress, corrosion of connectors, wiring damage from road debris or repairs, and electrical faults such as short circuits. In some cases the sensor can be marked as faulty after the airbag system records an event, even if the sensor appears intact, so diagnostics are essential.

Notes For Mechanics And DIYers

Inspect sensors and associated wiring after any side impact or when the airbag warning lamp is illuminated. Use OEM-referenced part numbers when searching to ensure correct fitment: 9636982680, 8216H3, 550903000. Replacement typically restores correct operation, but final verification with a diagnostic scanner is recommended to confirm system readiness.