right ive just wired up my speed limit defencer, went for a quick test to make sure it works and it does, car doesnt run any differently in the slightest, everything smooth as always, when i booted it down the motorway my engine management light came on, i pulled over in the lay by, checked my oil and was real low (changing it today) when i turned my ignition back on, the light was gone, then when i booted it again it came on? i have FCD fitted but its never done this before