have 4 codes come up on adi could someone tell me what i would need to do to fix?
1.cylinder 4 glow plug circuit (electical fault0674

2.cylinder 3 glow plug circuit (electical fault0673

3.egr system:insufficent flow0401

4.boost pressure regulation :limit exceeded (overboost)p0234
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On the Glow Plug issues, I'd check the wiring connections (put some di-electric grease in the connectors to keep water and such out) especially the wiring harness ground connections to the block or body. Loosen them up and retighten to be sure they're making good contact.

The EGR and Turbo issue could be a vacuum supply issue if they get their vacuum from the same line. Check and make sure the vacuum lines that go the actuators are not cracked or leaking. The vacuum source for these may not be manifold vacuum but instead use a vacuum pump. However, I can't say for sure on your car.