A 320d that drops into limp mode (power restricted to ~2,500 RPM) is one of the most common UK BMW faults. The cause is almost always one of: DPF blockage, intake swirl flap failure, boost leak or EGR cooler failure — in roughly that order on N47/B47.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].