Description
Engine wiring harness + pole for Citroën and Peugeot vehicles with 2.0 HDI RH02 engines.
High-quality engine wiring harness designed for Citroën and Peugeot 2.0 HDI RH02 applications. This positive/main engine harness (part numbers 9688405380 / 5642SX) supplies and distributes battery power to critical engine components and sensors. Built to match OE connector layouts and mounting points, it is intended for professional garages and experienced DIY mechanics who perform engine and electrical repairs on common-rail HDi diesel models.
Benefits
Reliable power distribution to starter, alternator, sensors and engine actuators; correct fitment for listed models; reduces troubleshooting time by replacing damaged or corroded original harness sections. Keywords: engine wiring harness, Citroën, Peugeot, 2.0 HDI, 9688405380, 5642SX.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C4 II; Citroën C4 Picasso; Citroën C5 X7; Peugeot 3008 I; Peugeot 308; Peugeot 5008 I
- Product Codes: 9688405380, 5642SX
- Additional Numbers: 100 kW; RH02
Function
The harness provides the main positive feed and signal routing for engine electrical components on 2.0 HDI RH02 engines. It carries battery power to the starter/alternator circuit, supplies fused power to sensors and actuators, and ensures secure connections between engine sensors and the vehicle’s electrical system. Proper routing and secure connector engagement are essential for stable engine management and reliable starting/charging operation.
Installation Recommendations
Only install this harness if it matches the vehicle’s engine code and connector layout. Before starting work, fully disconnect the negative battery terminal and follow the vehicle manufacturer’s safety procedures. Typical replacement steps:
- Remove any engine covers, air intake parts or trim obstructing access to the harness routing.
- Document connector positions and routing or take reference photos to ensure correct reinstallation.
- Carefully release connector clips and any retaining fasteners; avoid pulling on wires.
- Route the new harness following original clips and grommets; secure all clips and heat shields in place.
- Reconnect connectors firmly and reinstall removed parts. Reconnect the battery and verify charging and engine management functions.
Most Common Failure Causes
Wiring harness failures on 2.0 HDI engines are typically caused by thermal degradation (heat exposure near exhaust or turbo), mechanical abrasion where the harness rubs on brackets or engine components, connector corrosion from water ingress, rodent damage, or localized melting from contact with hot surfaces. Symptoms include intermittent electrical faults, poor starting, warning lights from the engine control unit, or charging system faults.
Notes For Mechanics And DIYers
When replacing the harness, inspect adjacent components (starter, alternator, battery terminals, ground straps and fuses) for damage or corrosion. Secure routing to prevent future chafing and avoid tight bends that stress the cables. If unsure about connector pinouts or routing, refer to vehicle wiring diagrams specific to the listed models and engine code.
