This seat belt assembly with integrated pyrotechnic pretensioner is intended as a direct replacement for the right front (passenger side) of Peugeot 407 vehicles. Ideal for professional workshops and experienced DIY mechanics, the unit restores the passive restraint system’s ability to remove slack and lock reliably in a collision. The part is commonly searched by product numbers and original equipment references such as 96439574XX and 8974HH.

Features And Function

The assembly combines a webbing retractor, locking mechanism and a pyrotechnic pretensioner. During a severe impact the pretensioner activates to rapidly take up slack in the belt, improving occupant restraint and interaction with the airbag. The retractor provides normal belt tensioning and emergency locking under sudden deceleration. Color: FXX Black.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Peugeot 407
• Product Codes: 96439574XX, 8974HH, NFP
• Additional Numbers: 8974HH
• Condition: Used Part
• Location: Right Front Passenger Side
• Color: FXX Black

Replacement Procedure

• Ensure Safety: Disconnect the vehicle battery and wait at least 10 minutes before starting work to avoid accidental pretensioner activation.
• Remove Interior Trim: Carefully remove the relevant B-pillar and side trim panels to access the belt retractor and upper anchor points.
• Disconnect Electrical Connector: Unplug the pretensioner electrical connector before unbolting the unit.
• Unbolt Retractor And Anchors: Remove the mounting bolts securing the retractor and lower anchor. Keep fasteners and note routing of the webbing.
• Fit New Unit: Install the replacement unit in reverse order, ensuring correct webbing routing and fully seated connectors.
• Final Checks: Tighten all fasteners to manufacturer torque specifications and perform an SRS system check with a diagnostic tool to clear related fault codes and verify functionality.

Installation Recommendations

• Always Follow Manufacturer Procedures And Torque Specs When Reinstalling Fasteners.
• Do Not Use A Seat Belt That Shows Signs Of Deployment, Damage, Or Severely Worn Webbing.
• After Installation, Run An SRS Diagnostic To Confirm Pretensioner And Airbag Systems Are Operational.
• Handle The Pretensioner Connector Carefully To Avoid Bending Pins Or Causing Corrosion.
• If Uncertain, Have The Replacement Completed By A Qualified Technician.

Most Common Failure Reasons

• Activation During A Collision: Pyrotechnic Pretensioners Are Single-Use And Must Be Replaced After Deployment.
• Mechanical Wear And Fraying Of The Webbing Due To Long-Term Use Or Abrasion.
• Corrosion Or Seizure Of Retractor Components, Especially In Vehicles Exposed To Moisture.
• Electrical Connector Damage Or Corrosion Causing Loss Of Pretensioner Function.
• Impact Or Abuse To The B-Pillar Area Leading To Misalignment Or Bolt Damage.

Part numbers and visual characteristics are frequently used to identify the correct replacement; searches by codes 96439574XX and 8974HH should help locate compatible units for the Peugeot 407. For safe and reliable operation replace any belt assembly that has been deployed, damaged or shows significant wear.