WhisperCarChat with your car. Fix problems before they cost you.
WhisperCar is the AI mechanic in your pocket. Tell it your make, model and year — then ask anything: check engine lights, trouble codes like P0420, oil changes, strange noises. Clear answers for your exact car, in seconds.
Your car finally has answers
Free download. Set up in under a minute — just enter your make, model and year and start asking.
Android · Free with in-app Pro · Cancel anytime through Google Play
A car diagnostic app that talks like a friend, not a manual
From "what's that light?" to "here's exactly what to do" in three steps
Tell it what you drive
Enter your make, model and year. WhisperCar builds a profile around your exact vehicle — specs, fluids, tire sizes, service intervals — so every answer fits your car, not a generic one.
Ask anything, any way
Type it or say it with hands-free Live Talk: a warning light, a trouble code from your OBD2 ELM327 scanner, a strange noise, or "why is my fuel economy dropping?"
Act with confidence
Get likely causes, how urgent it is, and what to do next — a quick DIY fix or a shop visit. Smart mileage-based reminders keep you ahead of oil changes, services and inspections.
Chat with your car
Mechanic-level answers without the jargon — ask about warning lights, noises and maintenance in plain language.
Live Talk voice mode
Have a natural back-and-forth conversation while you drive. No typing, no tapping — just ask out loud.
Trouble code decoder
Reads engine trouble codes (CEL) with an OBD2 Bluetooth adapter and explains what they mean for your car.
AI specifications
Auto-filled specs — engine, oil type, fluids, tire sizes, capacities — with on-demand re-checks.
Smart maintenance reminders
Mileage-based alerts for oil changes, services and inspections, timed to your actual driving.
Car photo gallery
Front, rear, side and top views matched to your vehicle so you always know what you're looking at.
Car problems, answered — then solved with WhisperCar
Straight answers to the questions drivers actually search — and how to get the vehicle-specific version for your own car.
What does the P0420 code mean? Causes, fixes & cost
Catalyst efficiency below threshold — what it really means, whether you can keep driving, and the cheap fixes to try before replacing the converter.
Read the guide → Warning lightsWhy is my check engine light on?
From a loose gas cap to a misfire: the most common causes, how to tell how serious it is, and when to stop driving.
Read the guide → MaintenanceHow often should I change my oil?
Conventional vs synthetic intervals, why "every 3,000 miles" is outdated, and how to reset your oil life indicator.
Read the guide → SpecsWhat oil does my car take? (And tire pressure, and every other spec)
How to find the exact oil type, viscosity and capacity for your engine — plus tire sizes, fluids and more.
Read the guide → DiagnosisWhy is my fuel economy dropping?
The 8 most common reasons your MPG falls — ranked from free fixes to real repairs — and how to find yours.
Read the guide → DiagnosisCar making a strange noise? What squeals, clicks and grinds mean
Decode the sound by when it happens — braking, turning, accelerating — and learn which noises can't wait.
Read the guide → OBD2Free OBD2 scanner app: read codes with your phone & an ELM327
Turn a $10 Bluetooth adapter and your Android phone into a diagnostic tool — and get AI explanations of every code.
Read the guide → MaintenanceCar maintenance schedule by mileage: 30k, 60k, 90k checklists
What actually needs doing at each interval, what it costs to skip, and how to never miss a service again.
Read the guide → AI mechanicAsk a mechanic online free: how an AI mechanic answers in seconds
Skip the forum wait and the shop diagnostic fee — how AI car assistants answer vehicle-specific questions instantly.
Read the guide →Frequently asked questions
What does the P0420 code mean?
P0420 means "Catalyst System Efficiency Below Threshold (Bank 1)" — your catalytic converter isn't cleaning exhaust gases as well as it should. It can be the converter itself, but it's often a lazy oxygen sensor or an exhaust leak, so don't buy a converter on day one. Learn more →
Why is my check engine light on?
Anything from a loose gas cap to a misfire can trigger it. A steady light usually means "get it checked soon"; a flashing light means "stop driving." WhisperCar lists the likely causes for your exact vehicle and how urgent each one is. Learn more →
How often should I change my oil?
Roughly every 3,000–5,000 miles on conventional oil and 7,500–10,000 miles on synthetic — but the right number depends on your engine and driving. WhisperCar tracks your mileage and reminds you when it's actually due. Learn more →
What oil does my car take?
It depends on your exact engine — viscosity, spec and capacity all vary. WhisperCar auto-fills AI-powered specifications for your vehicle (oil, fluids, tire sizes, capacities) with re-checks on demand. Learn more →
Why is my fuel economy dropping?
Most often: low tire pressure, a dirty air filter, worn spark plugs, dragging brakes or a failing oxygen sensor. Start with the free checks and work up. Learn more →
Why is my car making a strange noise?
The sound plus the situation is the clue: squealing when braking points to pads, clicking when turning to CV joints, grinding anywhere to "look at it now." Describe it to WhisperCar for causes ranked by likelihood for your car. Learn more →
Is there a free OBD2 scanner app that works with ELM327 adapters?
Yes — WhisperCar pairs with OBD2 ELM327 Bluetooth adapters to read engine trouble codes, then its AI explains each code in plain English for your specific car and tells you what to do next. Learn more →
What maintenance does my car need at each mileage?
Service items cluster around 30k, 60k and 90k miles — filters, fluids, plugs, belts, inspections. WhisperCar turns that into smart mileage-based reminders for your actual car. Learn more →
Can I ask a mechanic online for free?
With WhisperCar you ask an AI trained to answer like a knowledgeable mechanic — instantly, tailored to your make, model and year, with a free tier to start. Learn more →
Is WhisperCar free?
WhisperCar is free to download with a free tier. Carvis Pro unlocks unlimited chat, AI specs with re-checks, the car photo gallery and smart service reminders — billed through Google Play, cancel anytime. Get it on Google Play →
Finally understand the car you drive
Warning lights decoded. Maintenance handled. A mechanic-level AI that knows your exact car — free to download on Google Play.
Download WhisperCar free