Possible Causes

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

This DTC is set when the engine control module detects that the signal high time is greater than the maximum value
Electromagnetic compatibility interference
Other related DTCs
Connector is disconnected, connector pin is backed out, connector pin corrosion
Flex fuel sensor circuit, short circuit to ground, short circuit to power, open circuit, high resistance
Flex fuel sensor failure