its down to pressure, if the injectors block can cause that code followed by p2051 i think or close to that lol, if there leaking off too much drop in pressure causes the code, etc etc etc, its common for injectors to fail,. if one or more has failed you must check the fuel system for swarf as you would then need new pump injecor/s and a full system clean out inc drop tank

ive got a 05 x-type on my driveway (same engine) pumps failed filled fuel pipes etc with swarf and fooked injectors.

hence i said leak off to test the injectors, then recode to check they have not lost code, then fuel to see if the pumps caused the problems.