This driver seat airbag is an OEM-fit replacement designed for Citroën C8 and Peugeot 807 models and is commonly referenced by part numbers 5129066, 5252940 and 8216NQ. Built to integrate with the vehicle SRS system, the module restores occupant protection in the event of a frontal or side impact. Suitable For Professional Garages And Experienced DIY Enthusiasts, This Airbag Is Often Searched By Its Product Codes, So You Can Quickly Verify Fitment By Matching The Numbers.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C8, Peugeot 807
• Product Codes: 5252940, 8216NQ
• Additional Numbers: 5129066

Function

The Seat Airbag Is Part Of The Vehicle SRS (Supplemental Restraint System). It Inflates Rapidly During A Collision To Reduce Injury By Cushioning The Occupant And Controlling Forward Movement. The Unit Works Together With Seat Belt Pretensioners And The Airbag Control Module To Provide Effective Protection.

How The Part Is Replaced

Replacement Requires Careful Work On The Interior And Electrical Connectors. Typical Procedure:

• Disconnect The Battery And Wait At Least 10 Minutes To Allow SRS Capacitors To Discharge.
• Remove Seat Trim Panels To Access The Airbag Module Mounting Points.
• Release The Airbag Connector Locking Tab Carefully And Disconnect The Harness.
• Unbolt The Airbag Module From The Seat Frame And Replace With The New Unit.
• Reconnect The Harness Firmly, Refit Trim And Reconnect The Battery.
• Verify System Operation With A Diagnostic Tool And Clear Any SRS Fault Codes.

Installation Recommendations

• Always Disconnect The Battery Before Starting Work And Follow Manufacturer Procedures To Avoid Accidental Deployment.
• Handle The Airbag Module By Its Housing Only. Do Not Use Impact Tools Near The Inflator.
• Ensure Connectors Are Clean And Fully Seated; Replace Damaged Clips Or Wiring.
• After Installation, Use A Suitable Diagnostic Tool To Confirm System Integrity And Clear Faults; Check That The Airbag Warning Lamp Behaves Normally.
• If You Are Not Fully Confident With SRS Work, Have The Installation Performed By A Qualified Technician.

Most Common Failure Reasons

• Deployment During A Collision — Airbags Must Be Replaced After Activation.
• Connector Corrosion Or Damaged Wiring Causing Intermittent Faults Or Open Circuits.
• Physical Damage To The Airbag Module From Seat Removal/Installation Or Wear Over Time.
• Water Ingress Or Extended Moisture Exposure Leading To Electrical Faults.
• Seat Impact Or Improper Repairs That Compromise The Inflator Or Housing.

Buying This Airbag By Its Part Numbers (5129066 / 5252940 / 8216NQ) Ensures Faster Identification For Citroën C8 And Peugeot 807 Applications. Install Carefully To Restore Full Passenger Safety And Pass Vehicle SRS Diagnostics.

This left side seat airbag is an OEM-fit safety component designed for Citroën C8 and Peugeot 807 models. Ideal for professional workshops and DIY mechanics, the unit restores side-impact protection for the driver seating position. The part is commonly sought by its product codes (5129066 / 5252940 / 8216NQ), so including these numbers in searches will improve findability.

Function

The seat airbag is part of the vehicle’s Supplemental Restraint System (SRS). In a qualifying side impact or rollover event the module rapidly inflates to reduce lateral torso and pelvic injuries. Proper electrical connection and secure mechanical mounting are essential for reliable deployment and SRS system integrity.

How Replacement Is Performed

• Disconnect the vehicle battery and wait the manufacturer-recommended time for residual charge to dissipate (consult the vehicle service manual).
• Remove seat trim and any plastic covers to access the airbag module mounting points.
• Carefully unplug the airbag electrical connector(s), observing connector locking mechanisms and avoiding contact with exposed terminals.
• Unbolt the airbag module from the seat frame and replace with the new unit, ensuring correct orientation (left/right) and that the inflator faces the correct direction according to the seat design.
• Reconnect the electrical connector(s) securely, refit trim, and reconnect the battery.
• Use a diagnostic tool to check SRS fault memory and to confirm the airbag circuit is OK. Clear any stored fault codes only after verifying the repair.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C8, Peugeot 807
• Product Codes: 5129066, 5252940, 8216NQ
• Additional Numbers: 8216NQ (alternative reference)

Mounting Recommendations

• Always disconnect the negative battery terminal and wait the time recommended by the vehicle manufacturer before working on SRS components.
• Handle the airbag module by its housing only; avoid touching the inflator or connector pins.
• Use correct fasteners and torque values as specified in the vehicle repair manual. Improper torque can affect deployment behavior.
• After installation, perform an SRS system check with a diagnostic scanner to confirm there are no error codes and that the airbag warning lamp behaves correctly.
• When in doubt, have the final safety checks performed by a qualified technician experienced with Citroën/Peugeot SRS systems.

Reason Why The Part Most Often Fails

Seat airbags most commonly require replacement after deployment in a collision. Other frequent causes of failure include water ingress or corrosion of connectors (from spills or long-term moisture), physical damage to the seat structure during previous repairs, and electrical faults in the connector or wiring harness. Damage from improper removal or reinstallation can also render the unit inoperative.

Search Tips

Customers and workshops frequently search using the product codes 5129066, 5252940, or 8216NQ and the vehicle model names (Citroën C8, Peugeot 807). Including these references in a search will return the correct seat airbag for the driver’s left side.