how much does it cost to flush out the DEF tank parts and labor?

Hi - I am Dave, contributing to RepairPal and providing expert advice since 2010. A quote on this kind of service is going to require interfacing and asking the question to a shop near you. I'm wondering why you would need to flush it out? Are you concerned about contamination? Has the warning light and checked? Hands on testing is needed to determine what is going on. That's the best first step. Reach out to a shop near you - https://repairpal.com/auto-repair-near-me Click the link to find some shops near you who can help out!