Ff17 is throttle position sensor its the variable resistor on the throttle body or wiring to it thats causing the fault code the car will carry on working but the fueling will not be correct cos its working on get you home system so the ecm uses basic settings to keep the engine running ie, avg temp etc.
SOURCE: what does the check engine light vcm code
this has to do with the engines ability to warm up and meter the fuel. either the thermostat is sticking or the coolant temp sensor is out of range. there are 2 of them at least, one for the guage and one for the pcm. if you find it is the t-stat sticking, replace with jaguar parts.
SOURCE: Check engine light VCM code "FUEL 14"?
my manual says fuel fail 14 deals with yourr coolant temperature sensor is no in operating range
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