Home >> Audi >> 2009 >> A4 Base, 2D Convertible >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> 2.0L - Turbo Engine Mechanical, Engine Code(S): BPG, BWT >> 15 - Engine - Cylinder head, Valvetrain >> Cylinder head, removing and installing >> Cylinder head, assembly overview >> Checking cylinder head for distortion