the.com/diagnostics
The art of asking why before you start replacing things at random.
means The process and tools used to identify the cause of a problem in a body, machine, or system.
from From Greek diagnostikos, able to distinguish, built from dia (apart) and gnosis (knowledge) — literally knowing-through.
Car cultureOBD-II port standardized vehicle diagnostics across America in 1996.
Two halvesDiagnosis names the problem; prognosis predicts how it ends.
Hidden costOften the bill before any actual repair begins.