So the codes showed you have a EGR issue??  If not I would suspect the Discos MAP sensor issue when towing - basically when under load like towing MAP is not what the ECU expects and throws up a temporary fault display but clears by turning off - so if not EGR codes present try cleaning the MAP sensor - easily done.
If you shop around EGRs are not all that expensive but getting them blanked with a emulator/remap is preferred.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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