DiagNova - OBD2 Diagnostics

Guided OBD2 diagnosis

Free · Designed for iPad. Not verified for macOS.

New: guided live diagnosis, Pre-MIL prediction, a Safe-to-Drive verdict, and a shareable Second-Opinion certificate. Any ELM327 adapter. Free, no ads. DiagNova turns any ELM327-compatible OBD2 adapter into a guided diagnostic assistant. Most scanners stop at "here are your codes." DiagNova tells you the likely cause, whether the car is safe to drive, and walks you through the fix — using your car's own live data. WHY DIAGNOVA IS DIFFERENT • Guided live diagnosis — A decision-tree engine reads your live sensor data (RPM, fuel trims, MAF, O2, coolant) and ranks the most likely causes with confidence scores. No more swapping parts on a guess. • Safe-to-Drive verdict — A clear, conservative call — stop now, drive with caution, or you're OK — based on misfire severity, temperature, battery and code criticality. • Pre-MIL prediction — Reads Mode 06 on-board monitor trends to warn you before the check-engine light actually comes on. • Second-Opinion certificate — Export a shareable PDF that proves the diagnosis with the live data behind it. Bring it to the mechanic so you don't get upsold. • Multi-code root-cause correlation — When several codes fire together, DiagNova spots the single underlying fault that explains them. • Plain-language symptom search — Describe the problem in your own words and jump straight to the right playbook. EVERYTHING FROM ONE CHEAP ADAPTER • Stored, pending and permanent DTCs (Mode 03 / 07 / 0A). • Mode 06 on-board monitor test results and Mode 09 vehicle info (CALID / CVN / IUMPR). • Freeze-frame analysis — ranks causes from the snapshot saved when the fault triggered, no driving needed. • Per-cylinder misfire localization. • 97 DTC playbooks and 22 repair playbooks — and it learns: your repair outcomes refine the next diagnosis. EVERYDAY DASHBOARD • Live vitals strip — coolant, battery, fuel level, intake air, in real time. • Last-scan summary and session compare (DTC diff + PID trend charts). • Threshold alerts (coolant, fuel trim, battery) and readiness monitors for inspection. • VIN decoder, trip fuel-cost tracker, maintenance log with service reminders. • Adapter health check — detects common ELM327 clones and connection quality. • PDF / CSV export. FREE, PRIVATE, LOCAL-FIRST • 100% free — no subscription, no ads. • No accounts, no cloud, no tracking, no analytics. • All data stays on your device in a local SQLite database. Anything shared is strictly opt-in. WORKS WITH • Any ELM327-compatible adapter — BLE (Bluetooth Low Energy) and WiFi. DISCLAIMER DiagNova is a diagnostic aid, not a replacement for professional service. Always follow your vehicle manufacturer's repair procedures and observe safety warnings.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, KING DROID SRL, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    KING DROID SRL
    Size
    30.1 MB
    Category
    Productivity
    Compatibility
    Requires iOS 13.0 or later.
    • iPhone
      Requires iOS 13.0 or later.
    • iPad
      Requires iPadOS 13.0 or later.
    • iPod touch
      Requires iOS 13.0 or later.
    • Mac
      Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 KING DROID SRL
  • Privacy Policy

    • More by KING DROID SRL

    You Might Also Like