Use 5 Whys root-cause thinking to identify a process countermeasure for a diagnostic comeback.
A vehicle returns with the check-engine light two days after an evap repair. The original RO shows codes cleared, part replaced, and a short idle test, but no pending-code recheck. 5 Whys asks why repeatedly until the team reaches a controllable process cause and countermeasure. The common trap is stopping at technician missed the code. That may be true, but it is too shallow to prevent recurrence because it does not explain why the miss was possible or undetected. Why 1 and 2 Why did the light return? A second evap code became active after the customer drove. Why was…
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