Diago AI

Why is my car…?

The #1 question asked — and we have the #1 answer.

Diagnose your vehicle problem

Add your vehicle details and describe the issue. Cars, trucks, RVs, motorcycles, boats, farm equipment, small engines, and more.

✓ 3 of 3 free diagnoses remaining

Symptom-based guidance from your description — not a replacement for a scan tool or hands-on inspection.

Vehicle details

VIN optional — fills year, make & model

Decoded via NHTSA (free). We don’t save your VIN unless you opt in below.

Take or upload a photo of the whole vehicle for a ballpark year/make/model — use VIN above for exact specs.

Year

Make

Model

Mileage optional

Engine type optional

ZIP code or city (for local stores & mechanics)

Email optional — get your report emailed to you

The problem

Symptom category optional

Description

Fault codes optional

If you have codes from a scan tool, enter them here (e.g. P0300, P0420)