OBD2 Engine & Car Diagnostics

Turn your Android phone into a powerful OBD2 car scanner, Check Engine diagnostic tool and live engine data monitor.
OBD2 Engine & Car Diagnostics connects to compatible Bluetooth OBD2 interfaces to read vehicle fault codes (DTC), monitor ECU sensors, record driving sessions and analyse engine performance.
BLUETOOTH ELM327 ADAPTER REQUIRED
To read real ECU data, you need a compatible Bluetooth ELM327 OBD2 adapter or supported equivalent, plugged into your car's OBD2 diagnostic port. The adapter is sold separately and is not included with the app. A phone alone cannot read ECU data. Compatibility depends on the adapter, vehicle and ECU.
LIVE OBD2 DATA & CAR DASHBOARD
Track supported engine parameters in real time:
• Engine RPM, vehicle speed and engine load
• Coolant and intake air temperature
• Throttle position and intake manifold pressure
• Mass air flow (MAF), fuel trims and fuel level
• Fuel pressure and fuel rail pressure
• EGR readings and adapter voltage
• Other available OBD2 PID sensor values
The app automatically detects which standard parameters your car supports. Missing readings are not treated as zero or confirmed faults. Configure a live dashboard with selected gauges.
CHECK ENGINE LIGHT & CAR FAULT CODES
• Read supported diagnostic trouble codes (DTC)
• Inspect ECU and vehicle information
• Check emissions readiness monitors
• Review diagnostic context and fault information
• Clear supported codes when appropriate
Clearing an error code does not fix the underlying mechanical or electrical problem.
DRIVING SESSIONS & HISTORY
Record ECU measurements, timelines, charts, session events and statistics. Review saved sessions and diagnostic trends without reconnecting to the vehicle.
GPS & PHONE SENSOR ANALYSIS
When supported by your phone and permissions, capture GPS speed, acceleration, gyroscope, vibration and microphone-based measurements alongside OBD2 data.
ADVANCED ENGINE ANALYSIS — PRO
Use combined analysis to compare ECU and phone measurements, including GPS speed versus ECU speed and engine RPM versus microphone signals. Explore patterns involving engine RPM, speed, load, airflow, GPS, vibration and sound. Review supporting evidence, confidence levels and suggested follow-up checks. These are diagnostic observations, not confirmed mechanical diagnoses.
CHARTS & PDF DIAGNOSTIC REPORTS
Inspect time-based sensor charts, physical units and session statistics. PRO provides detailed PDF reports for saving, reviewing or sharing with your mechanic.
FREE & PRO
FREE offers core OBD2 features and live vehicle data. PRO unlocks advanced analysis, expanded history, replay tools, configurable dashboards and detailed reports. Choose monthly, 6-month or yearly PRO access, or a one-time Lifetime purchase.
SUPPORTED CAR BRANDS & COMPATIBILITY
Designed for vehicles supporting standard OBD2/EOBD, including compatible models from:
• Volkswagen (VW), Audi, Skoda, SEAT, CUPRA
• Ford, Opel, Vauxhall, BMW, MINI
• Mercedes-Benz, Renault, Dacia
• Peugeot, Citroën, DS, Fiat, Alfa Romeo
• Toyota, Lexus, Honda, Nissan, Mazda
• Hyundai, Kia, Suzuki, Mitsubishi, Subaru
• Volvo, Jeep, Chevrolet, Jaguar, Land Rover
In Europe, EOBD support generally applies to petrol cars from around 2001 and diesel cars from around 2004. Some older cars may work. A listed brand does not guarantee compatibility: supported PIDs and functions vary by model, year, engine, ECU and adapter. Manufacturer-specific diagnostics may not be available.
IMPORTANT SAFETY INFORMATION
This app provides diagnostic observations and does not replace professional vehicle inspection or manufacturer service procedures. Do not interact with the app while driving; review detailed results only when safe.

Recent changes:
What's new in OBD2 Engine & Car Diagnostics?

• Bluetooth ELM327 OBD2 car scanner support
• Live engine data, RPM, temperature and ECU monitoring
• Check Engine light and DTC fault code diagnostics
• GPS, vibration and phone sensor analysis
• Advanced ECU analysis and driving session history
• Interactive charts and detailed PDF reports
• Improved performance and diagnostic data stability

Connect a compatible ELM327 adapter and explore your vehicle's performance!