Service function guideTurbocharger Inspection

This guide delivers a complete, professional workshop procedure for inspecting a turbocharger on passenger cars and light commercial vehicles, covering shaft play measurement, boost leak detection, and oil supply verification. It is written for working mechanics and experienced DIY owners who already understand forced induction fundamentals and want a repeatable diagnostic sequence. Readers will learn how to prepare the vehicle safely, perform each check with common workshop tools, interpret the results against factory tolerances, and decide whether the unit can stay in service or must be replaced. The guide also addresses vehicle-specific differences, common mistakes, troubleshooting when readings are ambiguous, and the aftercare steps that protect a freshly inspected or replaced turbocharger.