Ask what happens if the first diagnosis is wrong. A straight answer names the next test instead of adding a second vague price.
Local availability of parts changes the timeline. A page that pretends every part is https://jimsexcelautoautomechani719625.blogkoo.com/auto-repair-in-bechtelsville-pa-for-small-business-what-the-details-actually-say-before-the-first-visit-63438546