I was trusted by Audi (Main Engine Plant) to investigate an exceptionally difficult engine failure problem at its main engine plant. The issue had remained unresolved for approximately two years and had resulted in around 60 engine failures.
Although I was not an engine technology specialist, I used Six Sigma and Design of Experiments to introduce new approaches to the investigation and broaden the scope beyond its initial focus. Within four weeks, we identified the first critical issue, and within six weeks, two previously unrecognized problems underlying the engine failures had been identified.
I subsequently presented the findings to senior Audi management, including the CEO. My contribution was not to redesign the engine, but to provide the breakthrough in problem understanding that had eluded the investigation for two years. Audi ultimately concluded that the existing engine design could not be corrected and proceeded with the development of a new engine.