3 door cossies do have an engine management light, as jr cossie has found. it's on the small panel above the digi clock, with the low fuel warning and low washer water warning. it's an orange warning lamp that comes on when the ecu senses a fault with a sensor or something.

look here and here and here for what to do (build a test light, check the error code, find the error and fix it).

job done. enjoy cossie ownership