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It is not the EGR valve but rather the EGR exhaust cooler. It is a booger to change just did one this week. Unless your are quite mechanically inclined leave it for someone else. Not a lot of special tools involved just hard work.
The easiest way to tell if it is the EGR cooler or head gaskets is to remove your oil filler cap. Being it is the high point in the engine moisture will collect here. Touch the water with your finger and taste it. If it tastes like antifreeze it is likely head gaskets. If there is no condensation it likely is the EGR cooler. The only way to confirm this is to loosen the X- over pipe and pressurize cooling system to about 15 psi. Do not start engine,and wait. If the cooler is leaking, after a few minutes it will be leaking out the exh pipe where you loosened it.
As for check engine or ECM codes, if will not set any codes so computer diagnostics will not help.
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