I called out Landrover Assistance after getting a Restricted Performance message and being reduced to 30mph. They found code P0405-77 and suggested I would need a new EGR valve (under warranty) After more severe problems I took it to the dealers who found the same code but their instructions were to follow LTB00739. The car seems to drive better but I am yet to test it on a long run.

Can someone please explain what LRB00739 does.

Has anyone experience of this fault