Fuel injectors do need to be coded but not doing so will not prevent the engine from starting and running. Common rail fuel injectors are very precise, and no two will ever be exactly the same. There are at least three injection phases, pre, main, and post, as well as after for DPF regeneration. The injector testing equipment generates a hexadecimal code which must be entered into the ECM. This code is so the ECM kno2s how to correctly operate each injector. If it's not coded, or if the code is wrong then the engine will not perform to it's optimum, or may run unevenly, but it should still run.
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