Bulkhead Workshop › Land Rover models › Land Rover Defender Td5 › Workshop guide › Injector loom & ECU plug oil check

Land Rover Defender Td5: injector loom & ecu plug oil check

Electrical · Defender (1990–2016) · 1998–2007

How often: every 12,000 mi or year, whichever comes first. Oil wicks along the injector harness into the ECU plug, causing misfires and limp mode.

Work safely: support the vehicle on axle stands, never a jack alone; let it cool first. Check figures against your workshop manual. You do this work at your own risk.

Parts

Injector harness (if oily)
Electrical contact cleaner

Tools

Screwdrivers
Rags

Step by step

Unplug the engine harness connector at the ECU (Defender: behind the right seat base; Discovery 2: see your manual for the ECU position).
Look inside the plug for oil. Any oil means the injector harness is wicking.
Clean the connector with contact cleaner. If oil returns, fit an updated injector harness (or the plug-in harness kit).

More Land Rover Defender Td5 servicing

Engine oil & filter change every 6,000 mi or 6 months
Centrifugal oil filter rotor every 12,000 mi or year
Air filter element every 24,000 mi or 2 yrs
Fuel filter change & bleed every 24,000 mi or 2 yrs
Drain water from fuel filter every 12,000 mi or year
Fan / auxiliary belt check every 12,000 mi or year
Coolant drain, flush & refill every 3 yrs
Grease propshafts every 6,000 mi or 6 months
Check swivel housings & seals every 12,000 mi or year
Check gearbox, transfer & axle oil levels every 12,000 mi or year
Change gearbox & transfer box oil every 24,000 mi or 2 yrs
Change front & rear axle oil every 24,000 mi or 2 yrs
Steering & power steering check every 12,000 mi or year
Inspect pads, discs & brake hoses every 12,000 mi or year
Adjust transmission handbrake every 12,000 mi or year
Brake & clutch fluid change every 2 yrs
Suspension bushes, arms & dampers every 12,000 mi or year
Wheel bearings & hub seals every 24,000 mi or 2 yrs
Chassis & bulkhead inspection, rust-proofing every year
Annual safety inspection every year
Monthly walk-round checks every month

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