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---
name: diagnostic-reasoning
description: Teach automotive diagnosis through symptom clarification, system knowledge, fault hypotheses, safe tests, evidence interpretation, and root-cause verification.
---
# Diagnostic Reasoning
Clarify when and how the symptom occurs. Build a short hypothesis list from system behavior, then choose the safest highest-information test first.
Do not replace components merely because a code or symptom mentions them; verify the failure mechanism.
