This left front pyrotechnic seat belt is suitable for Toyota Aygo models and is commonly compatible with platform siblings Citroën C1 and Peugeot 107. Identified by part codes 7P2170-P, 16084059XZ and B0009077XZ, the assembly includes a pyrotechnic pretensioner that activates in a collision to reduce occupant movement by removing slack from the belt. The unit is intended for the driver’s seat of 5-door vehicles up to the 2013 model year. Ideal for professional workshops and experienced DIY mechanics who search by part number or vehicle model when sourcing replacement safety components.

Technical Information

• Manufacturer: Stellantis / Toyota
• Model: Toyota Aygo (Up To 2013); Compatible With Citroën C1 And Peugeot 107
• Product Codes: 7P2170-P; 16084059XZ; B0009077XZ
• Other Numbers: 16084059XZ | 7P2170-P | B0009077XZ

Function And Application

The pyrotechnic seat belt combines the inertia reel and a pretensioner pyrotechnic charge. During a significant impact the pretensioner fires and retracts the belt instantly, improving occupant restraint and reducing forward movement. The mechanism is single-use: once the pyrotechnic element has activated during a collision it must be replaced. The belt assembly also contains sensors and electrical connectors that interface with the vehicle airbag/SRS system, so correct electrical reconnection and clearing of fault codes is essential after replacement.

Installation Recommendations

• Always Disconnect The Battery Before Working On The Seat Belt Or SRS Components And Observe Manufacturer Waiting Times To Allow System Capacitors To Discharge.
• Remove Interior Trim Panels Carefully To Access The Seat Belt Retractor And Anchor Points; Avoid Excessive Pulling On Wiring Harnesses.
• Unplug The Pretensioner Electrical Connector Using The Correct Release Method; Inspect Connectors For Corrosion Or Damage Before Reassembly.
• Fit The New Assembly Ensuring Correct Routing Of The Webbing And That All Bolts Are Tightened To The Vehicle Manufacturer’s Torque Specifications.
• After Installation, Use A Diagnostic Scanner To Check And Clear Any SRS Or Seat Belt Fault Codes; Confirm Proper Function Of The Belt Reminder System.
• If In Doubt, Have The Replacement Carried Out By A Qualified Technician With Appropriate Tools And Diagnostic Equipment.

Most Common Reasons For Failure

• Activation During A Collision — The Pyrotechnic Pretensioner Is Single-Use And Must Be Replaced After Deployment.
• Electrical Faults Or Damaged Connectors Causing Loss Of Signal To The SRS System.
• Mechanical Wear Or Contamination Of The Retractor Mechanism Leading To Poor Retraction Or Locking.
• Corrosion Of Mounting Points Or Connectors In Older Vehicles Or Those Exposed To Moisture.
• Physical Damage To Webbing From Sharp Objects, Heat Or Excessive UV Exposure.

Searches By Part Number (7P2170-P, 16084059XZ, B0009077XZ) Are Common — Use These Codes To Confirm Fitment Against The Vehicle Model And Year.

High-quality left front pyrotechnic seat belt (driver side) designed for Citroën C1 and Peugeot 107 (models produced up to 2013). This safety component integrates a pyrotechnic pretensioner to reduce occupant movement during a collision and works together with the vehicle’s SRS to improve crash protection. Ideal for professional workshops and experienced DIY mechanics looking for a direct-fit replacement by product code.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C1, Peugeot 107 (Up to 2013)
• Product Codes: 7P2170-P, 8974LL, 8974LN
• Additional Numbers: 16084059XZ, B0009077XZ

Function

The pyrotechnic pretensioner tightens the seat belt webbing in the milliseconds after a crash is detected, removing slack and positioning the occupant optimally before the main restraint (airbag) deploys. It is a single‑action safety device: once deployed in an accident it must be replaced.

Compatibility And Fitment

Fits left front (driver) position on Citroën C1 and Peugeot 107 first‑generation vehicles produced up to 2013, for 5‑door body versions. Always verify the product code on the original part before installation; this listing corresponds to the codes shown in the technical information.

Replacement And Installation

General replacement steps (for experienced mechanics):

• Disconnect the vehicle battery and wait at least 10 minutes to reduce the risk of unintended SRS activation.
• Remove the interior trim panels to access the belt retractor and pretensioner mounting points.
• Unbolt and disconnect the pretensioner electrical connector and remove the old unit.
• Install the new unit in the original position, connect the electrical connector and secure all fasteners per factory guidelines.
• Use an SRS‑capable diagnostic tool to clear fault codes and verify correct operation of the restraint system after installation.

Installation Recommendations: Always follow the vehicle manufacturer’s workshop manual. Replace any damaged mounting hardware and use the correct torque values specified by the manufacturer. If you are not equipped with SRS diagnostic tools or unsure about the procedure, have the replacement performed by a qualified technician.

Why This Part Fails Most Often

• Deployment During A Collision: The most common and definitive reason for replacement is activation of the pyrotechnic pretensioner in an accident.
• Electrical Or Connector Damage: Corroded or damaged wiring and connectors can generate SRS faults that require unit replacement.
• Mechanical Wear Or Contamination: Debris, water ingress or severe wear in the retractor mechanism can impair belt function and necessitate replacement.
• Age And Environmental Effects: Long service life in harsh conditions can contribute to deterioration of components and connectors.

Safety And Disposal

Do not attempt to disassemble or modify a pyrotechnic pretensioner. Improper handling may cause injury. Dispose of deployed or damaged pretensioners according to local regulations for pyrotechnic or hazardous automotive components.

Notes For Professionals

This part is intended for professionals and competent DIYers familiar with SRS systems. Replacing a pyrotechnic pretensioner requires adherence to safety procedures and proper diagnostic verification to ensure the vehicle’s restraint system is fully operational after repair.