Start with the symptom
Tell us what the vehicle does, not what the internet says it needs.
The sound, warning lights, timing and recent work give us a better starting point than a guessed component.

Test the relevant system
Evidence narrows the decision.
Appropriate tests can show what supports the concern and what still needs more investigation.

Explain the limits
A result should say what is known and what is not.
We keep the reported concern and the finding separate so you can see how the recommendation was reached.

Approve the next step
You choose whether parts or more work go ahead.
The cost and return plan stay visible before a component is ordered.
