Stop paying someone
to guess.
A diagnostic plan built from your car’s own service history — not a generic fault list you could have found on a forum. Ranked causes with honest confidence, a test you can run in a driveway, and a clear line for where DIY stops.
Describe what it does
Symptoms, noises, warning lights, codes, when it happens, and what was worked on recently.
It reads your history
Every service record, installed part and receipt already in your garage becomes context.
You get ranked causes
In order, with what each one is based on — and a confidence rating that is allowed to say “limited”.
You run the tests
Step by step, pass or fail. Each result narrows the next step, or sends you to a professional.
Intermittent rough idle.
Here is the whole plan.
Sample data on a sample vehicle. It shows the shape of a real report: what was read, what it concluded, and how sure it is.
- Oil & filter changeAUG 24 · 42,180 MI
- Performance intake installedJUL 12 · 41,600 MI
- Brake pads & rotorsJUN 08 · 40,850 MI
- No spark plug recordNOT IN HISTORY
A missing record does not mean the work was never done — which is exactly why the first test is a history review rather than a part order.
- 01Spark plugs past service interval42k miles with no replacement on recordLikely
- 02Ignition coil on a single cylinderMatches an intermittent, cold-start patternPossible
- 03Vacuum leak after intake workAn intake went on 3,400 miles agoWorth a look
Ranked from this car’s own records, not from a generic fault list.
Two ways to read it.
Expert, or step by step.
Every test comes both ways: the whole thing on one page if you already wrench, or one step at a time with the safety warning before the step, not after it.
From a symptom to a next step.
Example concern: intermittent rough idle. This report demonstrates how context, possible causes, and guided checks fit together.
Close the gaps before the guesswork.
Review service dates, mileage, and notes for relevant prior work. Record what is known and what needs confirmation. No physical repair is performed in this demo.
The relevant history is documented and readable.
The relevant history is missing or inconclusive.
Results stay in this preview and are not saved to an account.
This diagnostic plan is guidance only and is not a replacement for a certified mechanic. Paddiq does not claim certainty, and it will tell you when the evidence is thin rather than inventing a confident answer.
Give yours a home.
Your car deserves more than a folder of receipts.
Join the beta Free to get started. No credit card needed.