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Did you get a resolution to this, I have the same issue in my 04 Discovery
Trouble code P0455 means: Evaporative Emission System Leak Detected (gross leak/no flow)
It may be that your Heater core is leakng Antifreeze. Not good.
Overfilling a power steering system with fluid can cause overpressure. You may cause a leak in your lines or pump.
It look's like you have to use Land rover fluid-Part # LRN 2261 Power steering/Ace fluid. I put regular fluid in my 99 land rover now I have a leak.
If the gear box warning light is still coming on after repairing it on a 1998 Landrover Discovery, then the light has to be reset with the computer. Try disconnecting the battery for a few minutes.
A leak.
It means you have a small evaporative leak in your fuel system. Check that the fuel cap is tight, and check that the rubber seal is not cracked.
Try the cam covers
Broken or split hose Radiator leak heater core leak
no, You will have to replace the intake gasket, CAUTION DO NOT USE STOP LEAK.
assuming you have the k series engine I would investigate signs of head gasket problems if you have no visible leaks. you might want to try a pressure tester on the cooling system this usually makes leaks more evident.