What’s wrong with my car?
Describe what it’s doing — a noise, a light, a smell, a trouble code — and get the most likely cause for your exact car, how to confirm it, and what the repair should cost. Free, in about 30 seconds.
Why this beats searching the code
Your exact car, not a forum thread
The same code means different things on different engines. Every answer is built for your year, make, model and engine — not a generic definition.
Grounded in real NHTSA data
Your symptom is weighed against real recall and owner-complaint records for your vehicle, so known failure patterns surface instead of guesses.
An honest confidence score
You are told how sure the answer is and what would make it surer. When it is safety-critical or beyond a driveway fix, it says so plainly.
How it works
- 1
Describe the problem
Plain English. A sound, a light, a smell, when it happens — whatever you noticed.
- 2
We cross-check the real data
Your symptom is weighed against recalls, complaints and known failure patterns for your exact vehicle.
- 3
Get a straight answer
The likely cause, how to confirm it, what it should cost, how urgent it is, and what to ask if you go to a shop.
Common questions
Is the diagnosis really free?
Yes. Describe the problem and get a full diagnosis without creating an account or entering a card. You only need a free account if you want to keep the result, add the car to your Garage, or run more diagnoses.
Do I need an OBD scanner or the trouble code?
No. Plain English is enough — a sound, a smell, a warning light, when it happens. If you already have a trouble code, add it and the answer gets sharper, but it is never required.
How accurate is it?
Every diagnosis is cross-checked against real NHTSA recall and owner-complaint data for your exact year, make and model, and comes back with an honest confidence score instead of a confident-sounding guess. When the evidence is thin, it says so — and when a problem is safety-critical or beyond a driveway fix, it tells you to see a mechanic.
Will it just tell me to replace expensive parts?
No — it ranks the likely causes cheapest-plausible-first and tells you what to test before anyone orders parts. A flashing check-engine light is often a $48 sensor rather than the $1,200 job, and knowing which one you have is the entire point.
Does it work on my car?
If it is a car or truck sold in the US since 1996 — the OBD-II era — then yes: every make, every model. The more detail you give about year, make, model and engine, the sharper the answer gets.
Looking for something specific? Browse trouble codes, symptoms, or common problems by vehicle.