Direct-fit replacement motor for the left front (driver’s door) window regulator on Peugeot 407. Designed for professional workshops and DIY mechanics who need a reliable unit to restore smooth, quiet window operation. Compatible with common reference numbers used in parts searches (see Technical Information). The motor supplies consistent torque for lifting and lowering the glass and is suitable for use where the original unit shows signs of wear, slow operation, or intermittent electrical faults. Searching by part number such as 9646594580 or 9221Z1 increases the chance to find the correct replacement quickly.

Technical Information

• Manufacturer: Stellantis / Peugeot
• Model: Peugeot 407
• Product Codes: 9646594580, 9221Z1
• Other Numbers: 1137328125, NFP

Function And Application

The motor drives the window regulator mechanism to raise and lower the left front glass. It integrates with the vehicle’s electrical system and the regulator gearbox to provide the necessary movement and includes the electric folding-in function where fitted on relevant vehicle configurations. Intended for the driver’s door of Peugeot 407 models. Use this unit to replace failed or noisy motors and to recover precise window positioning and smooth operation.

Installation Recommendations

• Disconnect the negative battery terminal before starting to prevent short circuits and accidental operation.
• Remove the interior door card carefully, releasing clips and screws; keep fasteners organized for reassembly.
• Lower the glass to a position where you can access the regulator and motor fixing points, or support the glass securely before removing the motor.
• Disconnect the electrical connector to the motor, then unbolt and remove the motor from the regulator assembly.
• Inspect the regulator tracks and guide rollers; clean and lubricate sliding surfaces with appropriate grease before fitting the new motor.
• Fit the replacement motor, reconnect the electrical connector and temporarily reconnect the battery to test full travel and correct motor function before reassembling the door trim.
• After confirming correct operation, secure all fasteners to their original positions and torque where specified by the vehicle manufacturer, then refit the door card.
• Final check: cycle the window several times to ensure smooth movement and correct alignment.

Why This Part Most Often Fails

• Wear Of Internal Brushes And Commutator: Over time, brush wear reduces motor performance and can cause intermittent operation or complete failure.
• Gear And Spline Wear: Mechanical gears or splines within the motor/regulator can strip or wear, leading to slipping or inability to move the glass.
• Water Ingress And Corrosion: Moisture entering the door can corrode electrical contacts and motor internals, especially on older seals or damaged door cavities.
• Regulator Binding Or Damaged Cables: If the regulator becomes stiff, bent, or the cables fray, the motor is overloaded and will fail sooner.
• Connector And Wiring Issues: Corroded or loose connectors and broken wires cause intermittent faults and can damage the motor if voltage spikes occur.
• Lack Of Lubrication: Dry tracks and guides increase friction and accelerate wear on both the motor and regulator components.

Practical Tips

• When replacing the motor, check the condition of the regulator and guide rails; replacing worn items at the same time avoids repeat repairs.
• Keep replacement parts and reference numbers (9646594580, 9221Z1, 1137328125) at hand when ordering to ensure a fast match.
• Regularly lubricate window tracks and seals to extend the life of the motor and regulator.

High-quality replacement electric motor for the left front window regulator on Peugeot 407. Designed to restore reliable up-and-down movement of the driver’s side window, this motor is a direct-fit solution for workshops and DIY mechanics searching by OEM numbers such as 9663036680 or 9221Z1. The unit drives the regulator mechanism and integrates with the vehicle’s electrical system to deliver smooth, quiet operation and the electric folding-related function noted on some original equipment variants.

This part is intended for use by professional technicians and experienced DIYers. It is suitable when the window is slow, stuck, making grinding noises, or fails to move. Replacing the motor typically resolves issues caused by worn motor brushes, contaminated gearbox, water ingress, or seized regulator components. The motor runs on the standard 12 V vehicle electrical system.

Technical Information

• Manufacturer: Peugeot (Stellantis)
• Model: Peugeot 407
• Product Codes: 9663036680, 9221Z1
• Other Numbers: 1137328125

Fitment

Fits Left Front (Driver’s Door) on Peugeot 407 series. Typically compatible with 407 models produced in the mid-2000s (commonly referenced 2004–2011 production years); confirm physical match with the door regulator and connector layout before installation.

Installation Guidance

• Safety First: Disconnect the negative battery terminal before starting work to avoid short circuits and accidental window movement.
• Remove Door Trim: Carefully detach the door card and any vapor barrier to access the regulator and motor. Retain fasteners and clips for reassembly.
• Support Glass: Secure the window glass in the up position (use tape or a support) before unbolting the motor/regulator to prevent glass from dropping.
• Disconnect Electrical Connector: Unplug the motor connector and remove mounting bolts holding the motor to the regulator/door shell.
• Swap and Reassemble: Install the replacement motor, reconnect the electrical plug, reconnect the glass to the regulator, and test full travel before refitting the door trim.
• Final Checks: Verify correct operation, listen for abnormal noises, and ensure the window seals and tracks are lubricated for smooth movement.

Recommended Installation

We recommend replacing the motor on a supported workbench or with the door panel removed and the glass secured. Check the condition of the regulator (tracks, cables, sliders) while the motor is out—replacing a worn regulator at the same time avoids repeat removal. Use dielectric grease on electrical connectors and light lubricant on window channels. If corrosion or water ingress is present in the door, address sealing and drainage to extend the life of the new motor.

Why This Part Commonly Fails

Common failure modes include brush wear and commutator degradation inside the motor, water or dirt ingress causing electrical faults or gearbox corrosion, stripped or broken plastic gears, and mechanical jamming of the regulator (cable fraying or worn sliders). Frequent use, exposure to moisture, and lack of lubrication accelerate wear. Symptoms typically include slow movement, grinding or clicking noises, intermittent operation, or complete loss of function.

If you are searching by part number, this motor is often listed under OEM references 9663036680 and 9221Z1. Replacing the motor promptly when first symptoms appear prevents additional damage to the regulator and glass mechanism.