It's not available as spare from LR, your only chance is from a scrapyard or bite the bullet and buy a new engine harness, it will improve driveability as well cos it contains all the sensor's plugs and they are all affected by heat in time so the signals are not 100% accurate anymore...i replaced mine as preventative maintainance as i didnt like the look of the old one and the engine ran much better after that without having any fault logged before