Trust the car’s data, Not the sales pitch.
Know what you're buying before you pay. Plug in your Bluetooth OBD‑II scanner. Diagnose AI does the digging for you. It uncovers hidden trouble codes, detects possible code resets, spots possible VIN mismatches, and checks safety recalls.
A car can look perfect and still hide expensive problems.
When you buy used, the seller usually knows the vehicle better than you do. A clean dashboard is helpful—but it is not the whole story.
- A recently cleared warning light can make a problem harder to spot in a quick test drive.
- You may not know which signals deserve a mechanic's second opinion before you commit.
- A basic code reader gives you data but little help deciding what to do next.
More evidence. Less guessing.
Diagnose AI organizes the signals available from the vehicle into a buyer-friendly report, so you can understand what deserves a closer look before you negotiate.
Plain-English signals
Understand codes, readiness, and vehicle data without a mechanic dictionary.
Clear priorities
See what may be routine and what deserves a closer look before you buy.
Better seller questions
Leave with a practical list of items to discuss, verify, or inspect further.
Bring clarity to the driveway.
VIN and recall context
Confirm vehicle specs against the physical VIN plate and check for unperformed safety recalls before you buy.
Turn scan signals into the right seller questions
Diagnose AI interprets obscure fault codes and readiness flags so you know exactly what to ask the seller or a mechanic.
Illustrative sample. Results and available data vary by vehicle, adapter, and vehicle-system support.
Check-engine light on? Start with context, not panic.
Connect your scanner to turn supported codes and vehicle data into a plain-English explanation, practical next steps, and likely repair possibilities—so you can speak with a mechanic better prepared.
Get the app Informational guidance only. Safety-critical concerns should always be verified by a qualified mechanic.What the code means
Translate technical fault codes into language you can actually understand.
What to do next
See what may need attention now and what can be investigated next.
Likely repair paths
Review possible causes and repair outcomes, ordered from more likely to less likely.
Better mechanic questions
Walk into the repair conversation knowing what to clarify before approving work.
Three steps to a more informed offer.
Enter or scan the VIN
Identify the vehicle and check for applicable open safety recalls before you spend time negotiating.
Inspect and connect
Follow the guided inspection and, with a compatible adapter, collect read-only OBD-II evidence from the vehicle.
Get your buyer report
Review codes, readiness, reset context, VIN consistency, supported live data, priorities, and questions to ask the seller.
Works with standard $10–$35 Bluetooth OBD-II scanners.
No proprietary hardware needed. Diagnose AI connects over Bluetooth with many standard OBD-II scanners, including Bluetooth Low Energy models. It supports many vehicles sold in the United States, including most gasoline vehicles from 1996 onward and light-duty diesel vehicles from 1997 onward. Available information varies by vehicle and scanner.
Need help connecting, scanning, or restoring Pro?
Email support with your phone model, OS version, vehicle year/make/model, adapter brand, and a short description of the issue. Most adapter problems are solved by checking ignition state, Bluetooth permissions, and adapter compatibility.
Include this for faster help
- Phone model and OS version
- OBD-II adapter brand and model
- Vehicle year, make, model, and engine
- Screenshot or fault code if available
Questions buyers and drivers ask before getting started.
Do I need an OBD-II adapter?
Yes. Diagnose AI needs a compatible OBD-II adapter to read fault codes and vehicle data from your car. The adapter plugs into the vehicle's diagnostic port.
Can Diagnose AI tell me whether a used car is safe to buy?
No app can guarantee a vehicle's condition. Diagnose AI helps you identify supported diagnostic signals, organize what they may mean, and decide when to ask more questions or get a qualified pre-purchase inspection.
Does a recent reset clue prove the seller is hiding something?
No. Incomplete readiness monitors or recently cleared information can happen for many reasons. They are useful context to ask about and, if needed, investigate with a mechanic—not proof of dishonesty or mileage fraud.
What does the buyer report include?
Where supported, the report can organize fault codes, readiness status, reset context, VIN consistency, applicable recall information, live data, priorities, and practical questions to ask the seller.
Is this a replacement for a mechanic?
No. Diagnose AI provides informational guidance to help you understand codes and prepare for repair. Always verify safety-critical issues with a qualified mechanic.
Can the app tell me if it is safe to drive?
The app can provide practical urgency guidance based on the code, common causes, and symptoms. It cannot guarantee safety. If the vehicle feels unsafe, stop driving and get professional help.
Does every vehicle show the same live data?
No. Available data depends on the vehicle, adapter, ECU support, and connection quality. Some vehicles provide more sensor data than others.
How do I restore a Pro subscription?
Open the app, go to your profile or subscription screen, and tap Restore Purchases. App Store purchases are managed by Apple.
Clear policies. Straight answers.
Privacy Policy
Effective May 24, 2026 · Updated October 17, 2026
Diagnose AI collects only the information needed to provide, protect, and improve the app.
1. Information We Collect
- Account and Purchase Data: Email address, account identifier, product and transaction details, and purchase status. Payment-card details are handled by the app store and are not provided to us.
- Vehicle and Diagnostic Data: VIN and vehicle details, fault codes, available readings, mileage, symptoms, guided-check answers, scan history, and saved reports.
- AI and Support Content: Questions, chat history, vehicle context, and information you choose to send when requesting support.
- App Diagnostics: Limited pseudonymous usage events and redacted error information may be collected to improve reliability.
2. How We Use Your Data
- Operate your account, scans, saved reports, and purchases.
- Identify vehicles, check available recall data, and provide diagnostic and AI-assisted guidance.
- Provide support, maintain security, and improve app reliability.
3. AI and Service Providers
Relevant vehicle data, diagnostic information, and messages are sent to an AI service when you request AI features. We do not intentionally add your name, email address, or account ID, but anything you type may be included.
We share only the information needed with providers that support account access, cloud processing, AI features, vehicle and recall lookups, purchases, and app diagnostics. These providers must protect the information consistently with this policy. We do not sell personal information for advertising.
4. Data Security
We use reasonable technical and organizational safeguards to protect account-linked information. No online service can guarantee absolute security.
5. Retention and Your Choices
Account-linked data is kept while needed to provide the app or until you delete it or your account. Some transaction, security, or legally required records may be retained longer.
You can request account deletion in the app or at team@diagnoseai.us. Email requests are handled within 30 days. Account deletion does not cancel an app-store subscription, and it cannot remove PDFs you saved or shared outside the app.
6. Children's Privacy
Diagnose AI is not intended for children under 13 years of age. We do not knowingly collect data from children.
7. Contact
For privacy questions or data deletion requests, contact team@diagnoseai.us.
Terms of Service
Effective Date: May 24, 2026. Last Updated: October 17, 2026.
By downloading or using Diagnose AI, you agree to these Terms of Service. If you do not agree, do not use the app.
1. Description of Service
Diagnose AI is a vehicle diagnostic assistance application that can help organize supported VIN, recall, OBD-II, and live-data information into informational buyer and repair guidance.
2. Disclaimer of Liability
Diagnose AI provides informational guidance based on available vehicle data. It does not replace a qualified mechanic or pre-purchase inspection and cannot guarantee vehicle condition or safety.
- Vehicle and OBD-II information can vary by vehicle, adapter, system support, and connection quality. Some mechanical, electrical, structural, safety, or vehicle-history issues may not be visible through the available data.
- Buyer Reports support your decision-making but cannot certify vehicle condition, roadworthiness, history, mileage accuracy, recall completion, or seller intent.
- Confirm safety-critical concerns and high-cost purchase or repair decisions with a qualified mechanic or professional pre-purchase inspector.
- To the maximum extent permitted by applicable law, Diagnose AI and its affiliates are not responsible for losses resulting from decisions made solely from app-generated guidance. Nothing in these Terms limits rights or liability that cannot legally be limited.
3. AI-Generated Content
- AI-generated explanations may be incomplete or outdated and should be considered alongside available vehicle data and professional judgment.
- Do not rely solely on AI output for safety-critical vehicle decisions.
4. Subscriptions and Payments
- Pro features may be available through an in-app subscription processed by Apple.
- Subscriptions renew automatically unless cancelled at least 24 hours before the renewal date via your Apple ID settings.
- Refund requests must be submitted directly to Apple at reportaproblem.apple.com.
5. Account Responsibilities
You are responsible for maintaining the confidentiality of your account credentials. Use the app only while safely parked, and obtain the vehicle owner's permission before connecting an adapter to a vehicle you do not own.
6. Termination
We reserve the right to suspend or terminate accounts that violate these terms, abuse the service, or engage in fraudulent activity including attempts to exploit subscription systems.
7. Governing Law
These terms are governed by applicable law. Any disputes will be resolved through binding arbitration or in the jurisdiction where the company operates.
8. Changes to Terms
We may update these terms occasionally. Continued use of the app after changes constitutes acceptance of the revised terms.
9. Contact
Questions about these terms? Email team@diagnoseai.us.
The car has a story. You make the call.
Buying? Review the VIN, recalls, and warning signs in one Buyer Report.
Already driving? Understand fault codes, likely causes, and what to check next.