Pid 164 code for dt466 i do no its injection control pressure above below desierd level but need remedy?

There is an Injection Control Valve located on the rear of the Injection pump just above the air compressor that controls the injection pressure, that is causing your problem. If this does not fix it then your pump is bad. These valves are very sensitive and if you do not change your oil as you should then they become damaged.

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