Intake manifold runner position sensor / actuator fault — the classic VAG 2.0 TDI code for a broken swirl-flap linkage inside the plastic intake. On CR-TDI Golf, Passat, Tiguan and Audi A4/A6 it's an epidemic issue: the plastic lever that moves the flaps snaps off internally, the position sensor sees the mismatch, and P2015 stores. It's almost never the sensor — it's always the manifold.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email bob@bobsmechanicalrepairs.co.uk.