orange engine block light on dash

Hi All i have a manual 00 land rover discovery,yesterday while on motorway,revs starting getting slower,and had to pull over,and then noticed this orange light on top left of dash,i checked for oil water,all fine,restarted and after 1 hr,same happened again,anyone any ideas for cause of this
regards
jamesy

Sounds like it's gone into limp home mode. Could be any number of things, most likely emissions related, but could be something like an abs issue also.

Take it to a mechanic and have him read the dtc fault codes.