Description
Third Brake Light for Peugeot 407 Sedan.
This high-mounted stop lamp is a direct-fit replacement designed for mechanics and DIY enthusiasts who need a reliable, OEM-style solution for the Peugeot 407 sedan. Supplied under reference 6351S9, the unit restores the central brake signal required for road safety and legal compliance. The part is suitable for workshop installation and for competent home repairs — it offers precise fitment, sealed electrical connections and straightforward installation access from the trunk area.
Technical Information
- Manufacturer: Stellantis (Peugeot)
- Model: Peugeot 407 Sedan
- Product Codes: 6351S9
- Other Numbers: No additional known OEM numbers
Installation Recommendations
Removal and replacement are generally performed from inside the trunk. Typical steps:
- Open trunk and remove the interior trim panel to access the lamp housing (use a trim tool to avoid damaging clips).
- Disconnect the electrical connector and remove any retaining screws or clips securing the lamp.
- Withdraw the old lamp assembly, clean the mating surface and check wiring and connector for corrosion or damage.
- Install the new lamp, secure with original fasteners, reconnect the electrical connector and test all brake light functions before refitting trim.
Recommended tools: trim removal tool, Torx or Phillips drivers (depending on vehicle specification), small socket set and a multimeter for electrical checks. As a safety precaution, disconnect the negative battery terminal if you will be working on wiring or connectors to avoid short circuits. Avoid overtightening fasteners and ensure sealing surfaces are clean to maintain water resistance.
Why It Fails Most Often
- Water Ingress: Damaged seals or cracked lens allow moisture to enter, causing corrosion or short circuits.
- Connector Corrosion: Road salt and humidity can corrode contacts and cause intermittent operation.
- Impact Damage: Rear impacts or pressure on the boot lid can crack the lens or break mounting tabs.
- Lighting Module Wear: Depending on the version (bulb or LED), bulbs burn out or LED modules/solder joints can fail over time due to thermal cycling.
Fitment And Notes
Fits Peugeot 407 Sedan models referencing part number 6351S9. Search engines and repair shops commonly reference the product by this code, so including it in orders and repair records speeds identification. For a lasting repair, inspect the wiring harness, connector seals and mounting points during replacement to prevent repeat failures.
Restore the central brake signal quickly and safely — ideal for professional garages and skilled DIYers who demand correct fitment and reliable operation.
