I have a non-EGR head that I just installed onto my 07 Subaru Outback. The engine does have an EGR on it. So my question is this, if I just leave the EGR pipe unconnected but the valve is and open to air would that throw a CEL? When I check the OBD2 list for the 07 Subaru it only has a p0400 which is when there is no flow. The sensor is basically sensing flow, I am not sure if it knows the difference between getting flow from the exhaust port of the head versus flow from atmosphere.
Reason I ask is that I don't want to drill and tap the new head if I don't have to. I will do it though if having the EGR open to atmosphere is going to throw a CEL.
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