Symptoms
Oil and dust on the ECU plug under the driver's seat, misfires or running issues.
The fix, step by step
- The injector harness lives inside the rocker cover; oil wicks out through the plug seal and along the main loom to the ECU.
- Remove the acoustic cover, unplug the barrel connector and check for oil.
- Replace the injector harness; if oil has reached the main engine loom, replace that too.
- Light contamination can be flushed with contact cleaner, but replacement is the real fix.
Tools & part numbers
- Basic hand tools, contact cleaner
- genuine injector harness
Where to buy the parts
Td5 injector harness and rocker cover gasketRovers North ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Land Rover 90 / 110 / Defender parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.