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Explore possible causes
Jax asks follow-up questions about your symptoms and vehicle. AI guidance can be wrong and is not a substitute for an inspection.
HoodHero for drivers
Your car problem, explained properly.
Car making a new noise, or a warning light worrying you? Describe the symptoms to Jax, explore possible causes and compare estimated repair costs before deciding what to do next.
- Membership required for main features
- No OBD adapter needed for chat
- Built around your vehicle
Illustrative example, not a quote or guaranteed saving.
Before buying diagnostic hardware
Do you need an OBD adapter to get started?
No adapter is needed to discuss symptoms with JAX. Reading codes directly from the vehicle is a separate task. Our guide to AI car diagnosis without an OBD scanner explains the difference and how to prepare a useful symptom description.
Understand your vehicle history
What do those MOT advisories actually tell you?
Read our guide to MOT history, advisories and mileage to compare past tests, collect useful records and prepare questions for your garage. Includes a free notes worksheet.
More than a fault-code reader
What HoodHero helps you do.
£
Compare real options
See estimated DIY and garage costs, likely time, difficulty, tools and parts before choosing a route.
✓
See what a repair involves
Review steps, tools, difficulty and safety warnings. Only attempt work within your competence; use a qualified mechanic when needed.
VIN
Identify the right vehicle
Use VIN or UK registration data where available to reduce guesswork around specification and fitment.
OBD
Make sense of OBD-II
Connect supported ELM327 equipment and turn diagnostic trouble codes into understandable next actions.
PDF
Build a useful history
Keep vehicles, diagnoses and completed repairs together, then export records for resale or reference.
How it works
A better decision in three steps.
Add your vehicle
Enter what you know or use a supported vehicle lookup to start with the right context.
Describe the symptom
Chat naturally, dictate hands-free or add a photo when something visual matters.
Choose the next step
Review possible causes, estimated costs, safety and difficulty before taking action.
Safety comes first
Know when not to keep driving.
HoodHero highlights urgent symptoms and repair risks, but it cannot physically inspect your vehicle.
Jax is an AI assistant, not a certified mechanic. If a warning involves braking, steering, fuel, fire, overheating or immediate danger, stop safely and seek qualified help.
Download is free; the main diagnostic and repair features require a paid membership. Available plans, prices, renewal terms and any eligible offers are shown in the app before purchase.