Aaron Lamert

I have F-Pace 2017 which when sitting still in idle once warmed up is letting exhaust fumes into cabin. Had the car 8 months the before problem started. New injectors put in, four new seals with 7 inch bolts and a new hose. Four visits to the same garage and its still not fixed. They are now saying they think there is a pressure issue and it's due to a possible mapping issue? Any suggestions as I haven't mapped it.