Just to second everyone else, 2010 transit, dodgey injector bore washed cylinder and scored all the bore, new injector, piston, rings & shells etc, honed cylinder and been fine ever since, engineering company we use said they've done stacks of em!!! Our customer replaced all injectors to prevent it happening again in the near future! Symptoms were a DTC for injector circuit, knocking noise and low compression on offending cylinder!

Hth
Craig