This high-quality rear wiper motor is a direct-fit replacement commonly used on Citroën C8 and Peugeot 807 models. It restores reliable rear-window wiping and washer operation, reducing streaking and improving rear visibility in wet conditions. Many customers search for this item by part number (for example 1400416980 or 1497791080), so the exact references are included below to help you find the correct unit quickly.

Technical Information

• Manufacturer: Valeo
• Model: Citroën C8; Peugeot 807
• Product Codes: 1400416980, 1497791080, 53028612, 6405EN
• Other Numbers: 6405EQ (Washer Grommet Reference)

Application And Fitment

Fits rear wiper assemblies on Citroën C8 and Peugeot 807 (factory models produced in the 2000s). Check the listed product codes when searching — this part is frequently referenced by its OEM numbers.

Function

The rear wiper motor converts vehicle electrical power into the mechanical motion required to sweep the rear wiper arm across the glass. It incorporates a small gear drive and output linkage that moves the wiper arm and ensures the blade parks correctly at the rest position. A secure electrical connector provides power and sometimes a park/position signal to the vehicle wiring.

Common Causes Of Failure

Typical failure modes include water ingress and corrosion of the motor housing or gearbox, worn brushes or commutator, seized or damaged output gear, deteriorated seals, and electrical faults such as poor grounding or connector corrosion. Problems often appear after many years of exposure to weather, salt and dirt, or when the wiper linkage seizes and places extra mechanical load on the motor.

Replacement Frequency

Service life varies with use and environment; many rear wiper motors remain reliable for several years, while in harsh climates or with heavy use failures may appear after around 8–12 years. Regular inspection of the wiper arm, linkage and gaiter helps spot early signs of wear or water ingress.

Installation Recommendations

Installation should be carried out by a trained technician or an experienced DIY mechanic. Typical replacement steps:

• Open the tailgate and remove the interior trim to access the motor housing.
• Remove the wiper arm (undo the retaining nut and remove the arm from the spline).
• Disconnect the electrical connector and detach any linkage or grommet around the motor output.
• Unscrew the motor mounting fasteners and remove the old motor assembly.
• Fit the new motor, secure mounting fasteners, reconnect linkage and electrical connector, and replace the washer grommet if required (ref. 6405EQ available separately).
• Test the wiper and washer function before reassembling the trim; ensure the wiper parks correctly and operates without binding.

Typical workshop time: approximately 30–60 minutes depending on vehicle access and experience. Use basic hand tools and take care with trim clips to avoid damage.

Why Mechanics Choose This Part

This Valeo unit is a widely used replacement because it matches OEM fitment and mounting points for the listed models and is often cross-referenced by several part numbers, making identification straightforward for both professional workshops and DIYers searching by reference.

This rear wiper motor seal and washer jet pass-through is an essential sealing component used on the tailgate of Citroën C8 and Peugeot 807 models. Designed to prevent water ingress around the rear wiper motor and washer nozzle, the part is commonly searched and ordered by its reference numbers 1400371780, 6405EQ and 6405EP. Well suited for professional workshops and DIY mechanics, this replacement part helps restore reliable washer operation and protect the motor and tailgate electronics from moisture and corrosion.

Technical Information

• Manufacturer: Stellantis / Citroën Peugeot
• Model: Citroën C8, Peugeot 807
• Product Codes: 1400371780, 6405EQ, 6405EP
• Additional Numbers: 6405EP, 6405EQ (alternate references)

Function

The seal creates a watertight passage where the rear washer nozzle and its hose pass through the tailgate and interface with the wiper motor assembly. Its main function is to keep water, dirt and road salt out of the motor housing and electrical connections while allowing the washer jet hose to be routed cleanly to the rear window.

Common Failure Modes

The most frequent causes of failure are material aging and environmental damage: rubber hardening and cracking from UV exposure, deformation from repeated movement of the wiper arm, mechanical wear during service, and ingress of grit or frozen water that splits the seal. Once the seal is compromised, water can reach the motor or electrical contacts and accelerate corrosion or cause intermittent electrical faults.

Replacement And Installation Recommendations

Recommended steps for replacement (suitable for experienced mechanics and competent DIYers):

• Remove the rear wiper arm and cap to expose the retaining nut.
• Remove the tailgate interior trim to access the motor and the seal area.
• Disconnect the washer hose and electrical connector from the motor assembly.
• Remove the old seal/grommet and clean the surrounding area of dirt and corrosion.
• Fit the new seal into the tailgate hole, ensuring the sealing lip sits flush and the washer hose passes through without kinking.
• Reconnect the hose and electrical connector, refit the motor and trim, then reinstall the wiper arm and secure to the correct position.
• Verify sealing and operation by running the washer and wiper through several cycles and checking for leaks.

Practical tips: Use a silicone-based grease or appropriate rubber lubricant to ease installation and protect the seal without degrading the material. Replace any corroded fasteners or damaged hose clips. Avoid overtightening the retaining nut; tighten to the manufacturer specification when available.

When To Replace

Replace the seal if you observe water leaks into the tailgate, visible cracks or hardening of the rubber, poor washer jet alignment caused by a loose or damaged pass-through, or electrical issues in the rear wiper motor suspected to be caused by moisture. Proactive replacement can prevent motor corrosion and costly repairs.

Compatibility And Search Tips

This item is frequently searched by its reference numbers 1400371780, 6405EQ and 6405EP and fits Citroën C8 and Peugeot 807 models. When ordering, using the product codes speeds up identification in parts catalogs.