If the EGR is carbon-blocked open, the delete mod will not fix it.
The P0403 error means something is wrong on the electrical side of the EGR system - the solenoid is open circuit or short circuit. That is, the problem is in the wiring or the EGR solenoid itself.
Easy check...
The turbo vane control solenoid is the same. Just swap them and see if your EGR problem goes away and is replaced by boost control issues. If it throws a P0243 code, this is good - replace the solenoid. If not, start the painful process of tracing wires.
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