PRC4021 | Engine Wiring Harness - 2.25L, 2.5L Petrol, Diesel | Defender 1987-2006
To check the stock of Genuine Parts before placing an order please use our Contact Us page
To check the stock of Genuine Parts before placing an order please use our Contact Us page
Land Rover Part Number: PRC4021 - Engine Wiring Harness
PRC4021 is an engine wiring harness fitted to Defender models with 2.25L and 2.5L four-cylinder petrol and diesel engines. It carries connections for sensors, actuators, the engine control unit, starter and charging systems and routes electrical power and signal circuits between the engine control systems and the vehicle electrics. The harness is produced for multiple engine variants including petrol, naturally aspirated diesel and TDi installations - ensure the chosen harness matches the vehicle's engine type and connector layout. During installation ensure all connectors fully engage and the harness is secured to factory mounting points to avoid chafing and stress on terminals.
Use the compatibility data below to confirm fitment against your V.I.N.
Compatibility
- Defender (1987-2006) - 2.25L 4 Cyl Petrol
- Defender (1987-2006) - 2.5L 4 Cyl NA Petrol
- Defender (1987-2006) - 2.5L 4 Cyl NA Diesel
- Defender (1987-2006) - 2.5 4 Cyl TDi
Frequently Asked Questions
PRC4021 routes electrical power and signal circuits between the engine control systems and the vehicle electrics, providing connections for sensors, actuators, the engine control unit, starter and charging system on 2.25L and 2.5L four-cylinder engines. Common failure modes include damaged insulation, chafed wiring, corroded or broken connectors and intermittent faults caused by vibration, heat or contamination. Ensure the correct variant is selected for petrol, NA diesel or TDi engines, fully engage each connector and secure the harness to factory mounting points when fitting.
| Model | Variant |
|---|---|
| Land Rover Defender (1987-2006) | 2.25L 4 Cyl Petrol |
| Land Rover Defender (1987-2006) | 2.5L 4 Cyl NA Petrol |
| Land Rover Defender (1987-2006) | 2.5L 4 Cyl NA Diesel |
| Land Rover Defender (1987-2006) | 2.5L 4 Cyl TDi |
If you are unsure of compatibility with your vehicle, you can also confirm by checking against your V.I.N. Simply reach out to us with your V.I.N and desired part number via our Contact page or use our Finding Part Numbers page.
Inspect the wiring harness during routine servicing and replace it if insulation is damaged, connectors are corroded or terminals are broken, or if it is causing electrical faults. Have replacement and final routing carried out by a qualified technician to ensure secure attachment and correct connector engagement.
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