This complete engine wiring harness is designed for 1.6 e-HDi Euro 5 diesel engines used in a range of Citroën and Peugeot models. It carries all necessary power and signal connections between sensors, injectors, actuators and the engine control systems, ensuring reliable communication and proper engine operation. The harness is commonly searched by part numbers 9673749980, 9678305680 and 6585J5, so quoting these codes speeds up identification and ordering.

Key Features And Benefits

High-quality connector interfaces for direct fit, optimized routing to avoid chafing and heat exposure, and correct pinouts for sensors and injectors. Replacing a damaged harness restores intermittent faults such as misfires, sensor errors, poor idle, or no-start conditions that often come from wiring faults. Suitable for professional workshops and experienced DIY mechanics who perform engine electrical repairs.

Compatibility And Typical Applications

Fits Citroën and Peugeot vehicles equipped with the 1.6 e-HDi Euro 5 engine family. Common vehicle applications include:

• Citroën Berlingo B9
• Citroën C4 II
• Peugeot 308
• Peugeot Partner Tepee

Part numbers frequently used to identify this harness: 9673749980, 9678305680, 6585J5.

Technical Information

• Manufacturer: Citroën / Peugeot (Stellantis)
• Model: 1.6 e-HDi Euro 5
• Product Codes: 9673749980; 9678305680; 6585J5
• Additional Numbers: 6585J5 | 9673749980 | 9678305680

How The Part Works

The engine wiring harness routes power and signal lines between the engine control unit, fuel injectors, sensors (such as crankshaft position, camshaft position, temperature and pressure sensors) and ancillary components. It transmits sensor data to the ECU and delivers switching power to actuators, allowing the ECU to control fuel delivery, emissions systems and engine management functions.

Why This Part Fails Most Often

• Mechanical Damage: Abrasion against chassis components or clips causing wire breaks.
• Heat Degradation: Prolonged exposure to high temperatures near the exhaust or turbocharger can cause insulation to harden and crack.
• Corrosion and Moisture: Water ingress at connector interfaces leads to contact resistance and intermittent faults.
• Rodent Damage: Chewing of insulation or wires can cause open or short circuits.
• Accident Damage or Previous Poor Repairs: After-collision deformation or low-quality splices create failure points.

Replacement Procedure

Basic replacement steps for experienced technicians or competent DIY mechanics:

• Disconnect the negative battery terminal before starting to avoid short circuits or ECU damage.
• Label all connectors and take reference photos to ensure correct reconnection.
• Remove protective covers, routing clips and any obstructing components to access the harness path.
• Unplug connectors at sensors, injectors and actuators, releasing any locking tabs carefully to avoid damage.
• Extract the old harness, noting routing and clip positions. Compare the new harness to ensure identical connector types and lengths.
• Install the new harness following original routing, secure with clips and ties, and ensure no contact with hot or moving parts.
• Reconnect all connectors, reattach protective sleeves and covers, then reconnect the battery.
• Perform a full system check: clear fault codes, start the engine, and verify sensor readings and idle stability. Address any fault codes that appear after installation.

Installation Recommendations

• Always Disconnect The Battery Before Work. This prevents short circuits and potential ECU damage.
• Inspect Connectors And Pins For Corrosion Or Bent Pins Before Reassembly.
• Secure Routing Away From Heat Sources And Moving Parts Using Correct Clips Or Ties.
• Use Dielectric Grease On Exposed Connectors To Reduce Moisture Ingress Where Applicable.
• After Installation, Run A Diagnostic Scan And Test Drive To Confirm All Systems Operate Normally.

Typical Lifespan And Maintenance

There Is No Fixed Replacement Interval For A Wiring Harness; It Usually Lasts The Life Of The Vehicle Unless Damaged. Regular Visual Inspections, Prompt Repair Of Chafed Or Damaged Sections, And Protecting Connectors From Moisture Extend Service Life.

Notes For Buyers

This harness is intended for vehicles listed above and is often located by part number in workshop documentation. When ordering, include the manufacturer part numbers 9673749980, 9678305680 or 6585J5 to speed identification.

Product Overview

This main engine wiring harness is an OEM specification component designed for Stellantis vehicles equipped with the 1.6 e‑HDi 68 kW diesel engine. It supplies power and signal distribution between the engine sensors, actuators and the vehicle electrical system. The harness is a direct-fit replacement for the original part numbers listed below and is intended for professional workshops and experienced DIY mechanics who require an exact-match wiring solution for repair or replacement.

Applications

Commonly fitted to:

• Citroën C4 II (1.6 e‑HDi 68 kW)
• Peugeot 308 (1.6 e‑HDi 68 kW)

Function And Benefits

The engine wiring harness routes power and communication signals between the engine control modules, sensors (e.g. crankshaft position, camshaft position, temperature, pressure) and actuators (fuel injectors, EGR, throttle control where applicable). A correct harness ensures reliable sensor readings, signal integrity and secure electrical grounding. Replacing a damaged harness restores electrical reliability, prevents intermittent faults and avoids damage to connected components.

How Replacement Is Performed

Replacement requires careful disconnection and reconnection of multiple connectors and secure routing through engine bay grommets. Typical steps:

• Isolate vehicle power by disconnecting the negative battery terminal and wait a few minutes to discharge capacitors.
• Remove engine covers, intake plumbing or auxiliary components that obstruct access to the harness routing.
• Label or document connector positions to ensure correct reassembly. Unclip and release the harness from brackets and retainers.
• Disconnect all electrical connectors and sensors from the old harness and transfer any reusable brackets or clips if required.
• Install the new harness, route it following the original path, secure with clips and grommets, and reconnect all connectors firmly until they click.
• Reinstall removed components, reconnect the battery and perform basic checks: engine cranking, no warning lights, and verify sensor signals where possible.

Installation Recommendations

Recommendations for safe and durable installation:

• Always disconnect the battery before starting work and follow the vehicle manufacturer’s removal/installation procedures to avoid damage to components.
• Inspect all connectors, pins and grommets; clean corrosion and replace damaged seals to ensure proper contact and moisture protection.
• Replace missing or broken clips and secure the harness away from hot surfaces and moving parts to prevent chafing.
• Use dielectric grease on connector pins where appropriate to improve corrosion resistance and electrical contact longevity.
• After installation, clear fault codes and perform a test drive to confirm stable engine operation and absence of intermittent faults.

Most Common Causes Of Failure

• Mechanical damage and abrasion from rubbing against sharp edges or broken clips.
• Heat degradation from proximity to exhaust components or prolonged exposure to high under‑bonnet temperatures.
• Corrosion and water ingress at connector interfaces, often accelerated by damaged grommets or seals.
• Oil and chemical contamination weakening insulation and connector seals.
• Rodent damage or previous poor repairs that left weakened or spliced wires.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C4 II; Peugeot 308 (1.6 e‑HDi 68 kW)
• Product Codes: 9803029180, 9678305680
• Other Numbers: 9678305680 | 9803029180

For Mechanics And DIYers

If you are a professional technician or an experienced DIY mechanic, this harness gives you an OEM‑matched replacement to restore correct engine wiring. Ensure correct routing and secure fastening to prevent future faults. Using the original part numbers when ordering increases the chance of receiving the correct harness for the 1.6 e‑HDi engine.