Description
Complete engine wiring harness for vehicles with a robotized gearbox. For Citroën C1, Toyota Aygo and Peugeot 107 1.0 automatic.
Product Overview
This complete engine wiring harness is designed for 1.0 KR engines equipped with an automated (robotized) gearbox used in early Citroën C1, Peugeot 107 and Toyota Aygo models. It includes the main loom and all necessary branches to connect engine sensors, actuators and gearbox interface. Commonly referenced by product codes 821210H310 and B000687980, this harness is intended as a direct replacement for worn or damaged original wiring on vehicles with the specified engine and transmission configuration.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C1, Toyota Aygo, Peugeot 107
- Product Codes: 821210H310
- Other Numbers: B000687980
Function And Fitment
The wiring harness routes power and signal connections between the engine control sensors, actuators (injectors, ignition components), and the automated gearbox control interface. Proper routing and secure fixing prevent chafing, water ingress and connector stress. This harness is specific to the 1.0 KR engine with the robotized (automated manual) transmission used on the listed models—ensure the vehicle’s engine and gearbox type match the description before installation.
Installation Recommendations
- Disconnect the Battery Before Work: Always disconnect the negative terminal of the battery before starting removal or installation to avoid short circuits and protect electronic modules.
- Follow Manufacturer Procedures: Remove any obstructing components (airbox, engine covers, battery tray) to gain safe access. Observe original routing and secure points—replace any broken clips, grommets or cable ties.
- Inspect Connectors And Pins: Check all connectors and pins for corrosion, deformation or bent contacts. Clean with appropriate contact cleaner and replace damaged connectors rather than forcing a poor connection.
- Secure And Protect: Use original or equivalent clips and grommets to prevent chafing against sharp edges or moving parts. Ensure connectors at the gearbox and bulkhead are properly sealed.
- Post-Installation Checks: Reconnect the battery, clear any diagnostic trouble codes, and perform a functional check of engine management and gearbox communication. Verify no warning lights remain and that gears engage correctly.
- Professional Assistance: If you are not experienced with vehicle electrical systems, have the installation performed or checked by a qualified technician.
How To Replace (High-Level)
- Park vehicle on level ground, engage parking brake and disconnect battery.
- Remove components blocking access to the harness (battery, airbox, covers).
- Label and unplug each connector from sensors, actuators and gearbox—note routing and fixation points.
- Unbolt harness brackets and free the loom from clips and grommets, remove old harness.
- Route new harness following original path, secure with clips/grommets, and reconnect all plugs.
- Reconnect battery, perform diagnostic check and road test to confirm correct operation.
Why The Part Most Commonly Fails
- Connector Corrosion Or Water Ingress: Moisture and contaminated connectors lead to poor contacts and intermittent faults.
- Mechanical Damage And Chafing: Incorrect routing, broken clips or rubbing against sharp edges causes insulation wear and short circuits.
- Vibration And Heat Stress: Continuous engine vibrations and underbonnet heat can degrade insulation and connector housing over time.
- Rodent Damage: Chewing by rodents can sever or expose wires, a common issue in parked vehicles.
- Poor Previous Repairs: Improper splices, low-quality crimps or unsealed repairs introduce failure points.
Why Choose This Harness
Replacement with the correct harness restores reliable electrical connections between the engine and gearbox control systems, reducing faults, intermittent sensor errors and gearbox communication problems. Using the matching product codes (821210H310 / B000687980) increases the chance of direct fitment and reduces installation time for professional technicians and DIY mechanics alike.
Keywords
Wiring Harness, Engine Wiring Loom, Citroën C1 Wiring, Peugeot 107 Wiring, Toyota Aygo Wiring, 1.0 KR, Robotized Gearbox, 821210H310, B000687980
