OBD Master Pro | Car Scanner

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About this app

OBD Master Pro turns your phone into a professional car diagnostic scanner. Read and clear check engine codes, monitor live sensor data, detect mileage fraud, and check EV battery health — all with any ELM327 adapter. No expensive hardware lock-in.

VEHICLE HEALTH SCORE
Get an instant health rating (0-100) every time you scan your car. Track changes over time with the built-in trend graph and spot problems before they turn into costly repairs.

READ & CLEAR CHECK ENGINE CODES
Scan for stored, pending, and permanent diagnostic trouble codes (DTCs). Every code comes with a plain-language explanation — no mechanic needed. Clear your check engine light with one tap. Search through a built-in DTC database with manufacturer-specific fault codes for 30+ brands and 1,500+ enhanced definitions.

REAL-TIME LIVE DATA
Monitor 50+ OBD2 parameters in real time: RPM, speed, coolant temperature, fuel pressure, intake air temp, oxygen sensors, and more. View data on customizable live charts. Set threshold alerts with voice (TTS), vibration, and push notification warnings.

MULTI-ECU ADVANCED DIAGNOSTICS
Go beyond basic engine diagnostics. Scan ABS, SRS (airbag), transmission, body control module, instrument cluster, climate control, and power steering — features usually found only in professional scan tools costing $200+. Powered by UDS protocol (ISO 14229).

MILEAGE FRAUD DETECTION
Buying a used car? Protect yourself. OBD Master Pro reads the real odometer value stored in ECU memory and compares it to the dashboard reading. Detects rollback and tampering across 45+ vehicle brands.

EV & HYBRID BATTERY CHECK
Check your electric or hybrid vehicle's battery health: state of charge (SOC), state of health (SOH), individual cell voltages, pack temperature, and degradation analysis. Currently supports Hyundai/Kia EVs and Nissan Leaf, with more brands coming.

PERFORMANCE TOOLS
- Turbo boost pressure gauge
- Real-time torque & horsepower calculation
- CO2 emission monitor
- Quarter mile & 0-60 acceleration timer

HEAD-UP DISPLAY & CAR MODE
Project your speed and RPM onto the windshield with HUD mode. Switch to the simplified Car Mode interface while driving — large buttons, essential data only, voice commands for hands-free operation.

DATA LOGGING & REPORTS
Record full diagnostic sessions and export as PDF reports or CSV data files. Share scan results instantly via QR code. Track every trip with GPS logging and monitor fuel economy trends over time.

COMPLETE DIAGNOSTIC TOOLKIT
- Freeze frame analysis
- Emission readiness (I/M) check
- O2 sensor monitoring & analysis
- 12V battery & alternator health test
- Mode 06 on-board monitoring results
- Service interval reset
- VIN decoder & vehicle identification
- Custom PID builder for advanced users
- Fuel tank sensor calibration
- Smart maintenance reminders
- Customizable dashboard with drag-and-drop layout

MULTI-VEHICLE SUPPORT
Register and switch between multiple vehicles. Each vehicle keeps its own diagnostic history, health scores, and maintenance schedule.

WORKS WITH ANY ELM327 ADAPTER
No proprietary hardware required. Connect via:
- Bluetooth Classic & BLE (Low Energy)
- WiFi
- USB OTG — the only OBD2 app with wired USB support

ECU CODING — UNLOCK HIDDEN FEATURES
Customize your VW, Audi, Skoda or Seat with 80+ verified coding features. Activate needle sweep, mirror folding on lock, comfort turn signals, disable Soundaktor, configure DRL options, Coming Home lights and more. Safe & reversible automatic backup before every change. No expensive dongle needed. MQB platform.

- 20 languages: English, German, French, Spanish, Italian, Portuguese, Russian, Turkish, Polish, Dutch, Japanese, Korean, Chinese, Hindi, Arabic, and more

REQUIREMENTS
- OBD2-compatible vehicle (1996+ US, 2001+ EU, 2005+ most regions)
- ELM327-compatible Bluetooth, BLE, WiFi, or USB adapter

Download OBD Master Pro and take control of your car's health.

What’s new

NEW: ECU Coding for VW, Audi, Skoda & Seat — 80+ features to unlock hidden functions like needle sweep, mirror folding, comfort turn signals, Soundaktor disable and more. Safe & reversible with automatic backup.
Fixed: Foreground service crash on Android 12+
Fixed: Rare LazyColumn crash on certain screens
Improved: Category filtering on ECU Coding screen
Improved: All coding screen strings now fully localized