Description
Complete engine assembly from Citroen C5 X7 PEUGEOT 407 1.6 HDI 9HZ
Part description
We are selling a complete engine wiring harness for Stellantis (Citroën/Peugeot) cars, designed for the 1.6 HDI (9HZ) engine. The harness is a key part of the engine wiring – it connects control and sensing elements, injection and other engine components and ensures the correct transmission of power and signals.
It is mainly searched for by part number, so we recommend carefully comparing markings 9664740580 and 6569TQ with the old bundle (labels/markings on wiring) before ordering.
Technical information
Product codes
- Product codes: 9664740580, 6569TQ
Installation recommendations
Generally/typically for engine wiring harness replacement, the exact routing and attachment may vary by specific car design and equipment. Below is a practical procedure for this type of part.
1) Before assembly
- Compare with the old bundle: numbers 9664740580 / 6569TQ, type and number of connectors, branch lengths, position of holders/handles and grommets.
- Check the condition of the harness used: insulation damage, hardened/discolored parts from heat, punctured harness, pulled pins, locking fuses of the connectors, corrosion in the connectors.
- If the bundle is dirty, perform a gentle cleaning and visual inspection of all branches.
2) Necessary tools and materials
- Basic set of hand tools (ratchet/wrenches/screwdrivers)
- Pliers (for clips/tapes), cutting pliers
- Describing tape/labels and marker for marking connectors
- Contraction tapes, textile electrical tape (for final bundling and fixation)
- Suitable product for cleaning electrical contacts (according to service practices)
3) Step-by-step assembly procedure
- Disconnect the battery (to protect the electronics and avoid a short circuit).
- Before dismantling, document the wiring of the bundle (photos), or mark the connectors and branches.
- Release the fastening of the bundle: holders, clips, grommets and all fixing points so that the bundle can be pulled out without violence.
- Disconnect the connectors one by one – always with the fuses unlocked, do not pull on the cables.
- Remove the old bundle and compare it to the new piece “on the ground” (shape, branching, connectors, mounts).
- Place the new bundle in the engine compartment in the same line as the original, starting with the main branch and continuing with the branches.
- Connect the connectors one by one and check for proper seating and securing with fuses.
- Continuously fix the bundle in the original holders/clips so that it is not in tension anywhere.
- Check that the wiring is not routed over sharp edges and is not in contact with hot or moving parts (typically secure the risk areas with additional protection/fixation).
- Perform final bundling and fastening (cords/tape) only where this does not replace missing original fasteners.
- Reconnect the battery.
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4) Post-assembly checks and test drive/function verification
- Visual check that all connectors are engaged and secure and that no branch is pinched.
- Verify that the motor runs stable and that there are no dropouts/fluctuations typical of poor contact.
- After a short test drive, re-check the fastening of the harness and possible rubbing at the points of contact.
5) The most common assembly mistakes + how to avoid them
- Exchanging connectors → mark everything before disassembly, make photo documentation.
- Connector fuses not clicked in → always check the mechanical locking after connection.
- Cable routing in tension / without grips → use all original fixation points, add gentle fixation.
- Abrasion against edges and thermal stress → proper guidance and protection of risk areas.
- Work without disconnected battery → always disconnect, minimizes the risk of short circuit and damage to electronics.
Reasons why the part is damaged
- Thermal stress in the engine compartment – embrittlement of insulation, breakage of wires.
- Rubbing against sharp edges or bad attachment of the bundle – penetration of the insulation and subsequent short-circuits.
- Motor vibration – gradual loosening of connectors or interruption of wires in stressed places.
- Moisture and corrosion in connectors – transition resistances, signal dropouts.
- Unprofessional interventions in the electrical installation (connections, “twisting” of wires, inappropriate repairs) – unstable connection and future malfunctions.
