The ECU has detected a fault and switched to default settings - commonly called limp home mode. 
Hopefully just a clear of the codes will fix things or maybe just a dud sensor.  Unlikey to be more serious stuff.
I have had it twice on my FL1 - first was a failed fuel temp sensor and the second was some crude in the fuel shutoff valve - the ECU codes pointed me to the right direction in both cases.  While the check engine light was on the car drove like a dog bit still ran - not a lot of acceleration. 
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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