PHASE 10 DECISION SUPPORT
Start with evidence—not a replacement part.
Choose a code or symptom. Car Trouble Lab returns a reviewed sequence of safety actions, first checks, and confirmatory tests. It does not diagnose the vehicle.
Important limits
A vehicle can have more than one fault, and the same code can have several causes. Stop driving if braking, steering, fuel leakage, overheating, oil pressure, severe knocking, smoke, or restraint-system behavior makes the vehicle unsafe.
How the decision paths are built