Hey y'all, I'm new to these forums and have a car that I am trying to fix. The error codes are P0299- Turbo Underboost, P2227 Barometric Pressure Circuit Rage/Performance, and P00B7- Engine Coolant Flow Low/Performance. I'm currently trying to fix my girlfriend's old car so her father can sell it. Their "mechanic" replaced the turbo and water pump, however these codes are still showing and I believe the parts were bought brand new. Any thoughts? Any help is much appreciated!!