Description
Engine wiring harness + pole for Citroën and Peugeot vehicles with 2.0 HDi RH02 engines.
This genuine-style engine wiring harness is designed for PSA/Stellantis 2.0 HDi RH02 diesel engines and provides reliable power and signal distribution to sensors, injectors and engine peripherals. Ideal for professional workshops and experienced DIY mechanics, the harness replaces damaged or corroded wiring that causes intermittent faults, engine warning lights or loss of functions. The part is compatible with a range of Citroën and Peugeot models using the RH02 2.0 HDi engine and is supplied with the main positive pole/lead required for integration into the engine bay electrical system.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Vehicles with 2.0 HDi RH02 Engine
- Product Codes: 9688405380, 5642SX
- Additional Numbers: NFP
Compatibility / Fitment
Common applications include (but are not necessarily limited to): Citroën C4 II, Citroën C4 Picasso, Citroën C5 X7, Peugeot 3008 I, Peugeot 308, Peugeot 5008 I. Always confirm engine code RH02 when matching to the vehicle.
Function and What It Replaces
The engine wiring harness routes power and signal circuits between the battery, engine control components (sensors, injectors, actuators) and the vehicle electrical system. It typically includes connectors, protective sleeving, earths and the main positive pole/lead. Replacing a damaged harness restores reliable electrical paths, eliminates shorts and intermittent faults, and prevents further damage to sensors and control units.
How To Replace (Overview)
Recommended for trained technicians or experienced DIY mechanics. Typical replacement steps:
- Disconnect the negative battery terminal and wait a few minutes to stabilise vehicle electronics.
- Remove engine covers and any components obstructing access to the harness routing (airbox, intake ducts, hoses as required).
- Label and photograph each connector to ensure correct reconnection. Carefully unplug all connectors and detach retaining clips, cable ties and brackets.
- Compare old and new harnesses; transfer any brackets, grommets or temperature shields if necessary.
- Route the new harness following the original path, secure with new ties and clamps, reconnect all plugs and ensure good contact on earth points and the positive pole.
- Reconnect the battery, clear any stored fault codes and perform a functional check (crank/run, check for warning lights, monitor sensors).
Installation Recommendations
- Always Disconnect The Battery Before Work To Avoid Short Circuits And Damage To Electronic Units.
- Use New Cable Ties And Correctly Sized Grommets To Prevent Chafing; Replace Any Damaged Clips Or Heat Shields.
- Inspect Connectors For Corrosion Or Bent Pins; Clean With Appropriate Contact Cleaner If Needed.
- After Installation, Clear Fault Codes With A Diagnostic Tool And Verify Sensor Readings; Road Test To Confirm Repair.
- When In Doubt, Follow Manufacturer Repair Manual Procedures And Torque Specifications For Brackets And Fasteners.
Why This Part Fails Most Often
- Connector Corrosion From Moisture Ingress Leading To High Resistance Or Intermittent Contacts.
- Mechanical Damage During Previous Repairs Or From Chafing Against Engine Components.
- Heat Ageing And Brittle Insulation In The Engine Bay Causing Cracks And Shorts.
- Rodent Damage In Some Cases (Chewed Wires) Or Water Ingress After Seal/Grommet Failure.
Who Should Fit It
Recommended for professional garages and competent DIY mechanics who have experience with engine electrics and access to basic diagnostic tools. Incorrect installation or poor connections can cause drivability issues or damage to downstream components.
Keywords: Engine Wiring Harness, 2.0 HDi, RH02, 9688405380, 5642SX, Citroën, Peugeot, Engine Loom, Wiring Harness Replacement
