Range Rover Engine Swap NIGHTMARE: Fixing "Restricted Performance”

Is your Range Rover L405 4.4 TDV8 stuck in the dreaded "Restricted Performance" limp mode? After a full engine swap, this SUV was still suffering from severe power loss. In this step-by-step diagnostic video, I show you the real fix for Range Rover underboost and DPF fault codes (like P0046 and P242F) without instantly replacing expensive parts. We dive under the hood to perform a complete variable geometry turbo (VGT) actuator cleaning, vacuum/pressure test, and a precise turbo actuator calibration. Next, we tackle the exhaust system by forcing a full DPF (Diesel Particulate Filter) regeneration in real-time. Watch the live data as the soot mass safely trends down from 18.15g to 17.25g. 👇 The exact OBD2 Scan Tool I use for all my module calibrations, DPF regens, and builds is linked down below! 🛒 Get it here: https://amzn.to/4atbUNi By the end of the ECU and system resets, live data confirms the beast is back. We take the Range Rover out for a final road test to prove full power is restored with zero faults—and enjoy a well-earned massage-seat cruise along the way! 😌 ⏱️ Diagnostic Video Chapters: 0:00 - Range Rover 4.4 TDV8 (L405) Restricted Performance 1:45 - Diagnosing Limp Mode & Turbo Actuator Fault Codes (P0046) 3:30 - VGT Turbo Actuator Cleaning & Vacuum / Pressure Test 6:15 - ECU System Resets & Turbo Actuator Calibration 9:20 - Live Data: Forced DPF Regeneration Process in Real Time 12:45 - Monitoring DPF Soot Mass Trending (18.15g down to 17.25g) 15:30 - Final Road Test: Full Power Restored & Massage Seats! 📬 For collabs or questions: [email protected] #RangeRover #RestrictedPerformance #MechanicLife