The evidence-based mechanic helper.
"I just got quoted $3,800." Before you sign that estimate — get a second opinion built the way a good diagnostician actually works: evidence first, verdict last, and an honest list of what your problem isn't.
Then print the case file and hand it to your mechanic — you're paying for the fix, not the guessing.
The same loop a great diagnostician runs — never guess-and-replace.
Repair paperwork, trouble codes, photos, sounds, drive data. What already exists decides most cases.
Honest probabilities from your vehicle's documented failure history — not generic internet guesses.
The single cheapest question, photo, or driveway test that separates the leading suspects.
A ranked verdict, the don't-buy list, and a case file you can print for your mechanic.
Open the Kia and work a case yourself, or replay the documented F-150 case to see how it ends.
Case history stays alive while a vehicle is active. Lapsed vehicles go read-only for 90 days with export, then are deleted.
Before anyone theorizes, RootCause collects what already exists.
RootCause never directs work on brake hydraulics, SRS/airbags, or pressurized fuel — those hand off to a shop, every time.
Plenty of apps read codes. None of them keep a case file, weigh evidence honestly, tell you what not to buy, or hand you a printout for the shop.
Every answer, photo, and test result accumulates per-vehicle. The verdict cites its evidence — and keeps getting smarter about your exact vehicle.
The most valuable sentence in a diagnosis is "it's not the head gasket." Every verdict names the expensive repairs the evidence argues against.
Walk in with the diagnostic already done. You pay for the fix, not the guessing hours — and the printout is your defense against the upsell.
Per-vehicle pricing, no subscription surprise: your case history stays alive while your vehicle is active.
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