What Is Engine Diagnostics?
Diagnostics means finding the actual cause of a problem before touching parts. We use factory-level scan tools to read live data and fault memory, then verify with testing — smoke testing for boost and vacuum leaks, compression and leak-down for mechanical health, oscilloscope work for electrical faults. On BMWs we have the added advantage of having seen most failures many times: we know what an N54 does when its injectors go, and what an S55 crank hub problem looks like before it grenades.
