Really Disappointed. Paid over $500 dollars for re...

Really Disappointed. Paid over $500 dollars for regular service and fix check engine/ Def fault. Left after paying bill and both lites came on again. Told me would go away on its own. Never did. Then next day truck completely failed. Towed to Coastal Ford where they said it was nox sensor. Now they have me over barrel as part is double than cost online. Paid $4000 for extended warranty thru Secure , and they wont cover either. Online I found out this is huge problem with F350 s etc. Ford knows about it but will not issue recall. Never buy a Ford again.