This used Side Impact Sensor is designed for deployment control of side airbags and side curtain systems on compatible Citroën and Peugeot models. It registers lateral acceleration impulses and transmits a trigger signal to the airbag control unit when a qualifying side impact is detected. The sensor is an OEM TEMIC type, supplied with reference numbers commonly searched by workshops and DIY mechanics (1400576280, 8216NZ), making it easy to find and replace during collision repairs or when diagnosing airbag faults.

Technical Information

• Manufacturer: TEMIC
• Model: Citroën C2, Citroën C3, Citroën C3 Pluriel, Citroën C8, Peugeot 807
• Product Codes: 1400576280
• Other Numbers: 8216NZ

Function And Fitment

The side impact (lateral) sensor is an acceleration sensor dedicated to detecting rapid lateral deceleration. It communicates directly with the vehicle’s airbag control unit to permit timely deployment of side-impact protection. Typical mounting locations are the B‑pillar inner structure, door inner panel, or seat rail area depending on model and year. Correct orientation and secure mechanical fixation are essential for reliable operation.

Common Failure Causes

• Physical damage from previous collisions—impacts can deform or damage the sensor housing or mounting points.
• Connector corrosion or wiring faults—moisture ingress or abrasion may interrupt the signal path.
• Water ingress—especially on units mounted in door areas or lower pillars, leading to electrical shorting or internal corrosion.
• Incorrect handling during repairs—improper removal or impact to the sensor can alter calibration or break internal components.
• Rarely, electronic component failure due to age or manufacturing defects.

Installation Recommendations

• Always Disconnect The Battery Before Work: Remove the negative terminal and wait at least two minutes (or follow the vehicle manufacturer’s specified delay) to ensure the airbag system is de‑energized.
• Preserve Sensor Orientation: Install the replacement with the same orientation and mounting position as the original—incorrect alignment can prevent correct triggering.
• Use Correct Fasteners And Torque: Secure the sensor to factory torque values where available; avoid over‑tightening which can damage the housing.
• Inspect Wiring And Connectors: Clean or replace corroded connectors and repair damaged wiring to restore reliable communication with the airbag control unit.
• Clear And Verify Fault Codes: After installation, clear airbag system fault codes and perform a diagnostic check with a suitable scanner to confirm system readiness. If warning lights persist, diagnose further before returning the vehicle to service.
• Safety Note: Airbag system work can be hazardous. If unsure, have installation and verification performed by a qualified technician with appropriate diagnostic equipment.

Why Replace This Part

Side impact sensors are replaced primarily after collisions where side airbags deployed or were at risk of deployment, or when the airbag warning lamp indicates a fault traced to the lateral sensor circuit. Replacements are also common when corrosion or connector damage causes intermittent signals or permanent faults. Because these sensors directly affect occupant safety, timely and correct replacement is critical.

Compatibility Notes

The part is listed for multiple Citroën and Peugeot models and is often searched by its product codes 1400576280 and 8216NZ. Sensor variants can differ by side (left/right), production year or trim—always match the exact part number to the vehicle’s repair documentation or parts catalogue before fitting.