Inspection After Removal

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

Clean the EGR bypass valve and EGR bypass tube mounting surfaces of gasket material. Do not allow debris into the EGR bypass tube or EGR valve.
Clean the EGR bypass tube and the turbocharger mounting flange mounting surfaces of gasket material.
NOTE: It is common for the EGR components to have a buildup of carbon on their inside surfaces. This buildup is normal and does not need to be removed.
Inspect the EGR bypass tube for cracks, distortion, corrosion, and soot streaking on the outside of the connection tube, which would indicate an EGR leak.