01
Build the case
Tell us the year, make, model, engine, scan codes, symptoms, and what has already been tested.
AI diagnostics / real test paths
Stop throwingparts at it.Find the problem.
DiagWrench turns your vehicle symptoms into a guided, test-first diagnostic path—so you can work from evidence, not expensive guesses.
Year / make / model awareBuilt for DIY mechanics
DiagWrench command centerLive diagnostic
Active vehicle
1998 Ford F-150
4.6L V8 · P0171 · rough idle
In progress
Next check
Inspect for a vacuum leak
Verify unmetered air before replacing sensors.
Test plan
02 / 04- Read fuel trims at idle
- Smoke test intake system
- Confirm O2 response
Test first. Replace only when evidence points there.
No mystery advice. No parts-cannon repairs.
Each guide connects your vehicle details to a specific test, then shows what a pass or fail means before you spend on a repair.
How it works
A clear path from symptom to next move.
02
Run the right checks
Get a prioritized test path with the expected result, required tools, and the reason each check matters.
03
Make the call
Use the evidence to rule out noise, isolate the likely fault, and know when a repair actually makes sense.
Diagnose smart. Fix right.
Get a plan before you buy another part.
Start with the clues you already have. DiagWrench helps you ask the next useful question.
Start a diagnostic