what should I expect to pay a mechanic to have this done

Question

About what should I expect to pay to have this done?

Answer 1

P0401 Insuficient EGR flow

P0174 System lean Bank 2

This depends  on what was found and the what the fix was, When it comes to a fuel trim lean this is the condition of the condition, It can be from a faulty 02 sensor , to a vacuum leak , or related to the EGR that was insufficient. , In your case this would be a search and find repair and retest. so the amount of time spent would vary. Something like this would be the hourly rate the shop would charge, and how how long the shop diagnosis took. It going to be between you as a customer and them as a shop