OBD Master Pro ELM

OBD Master Pro turns your phone into a professional OBD2 scanner. Plug in a Bluetooth ELM327 (or compatible) adapter, connect, and read live engine data, diagnostic trouble codes, freeze frame, VIN and vehicle health — then clear the check engine light when the repair is done. WHY DRIVERS SWITCH TO OBD MASTER PRO • Fast ELM327 connection — scan paired Bluetooth adapters and start in seconds • Scan, read and clear DTCs (stored, pending and permanent) • Plain-English code descriptions, not just P0xxx numbers • Live PID dashboard: RPM, speed, coolant, load, throttle, MAF, boost, power, fuel pressure • Live charts plus 0–100 style acceleration tests • Vehicle health score with battery, charging, engine and turbo • Freeze frame, O2 sensor test, I/M readiness, fuel-system status • VIN decode and warning-light overview (MIL / check engine) • CSV and PDF export for shops, buyers and service history WORKS WITH THE ADAPTER YOU ALREADY OWN Designed for ELM327 Bluetooth OBD2 adapters and popular ELM-compatible dongles, including: • ELM327 Mini (Bluetooth) • vLinker FD, vLinker BM, vLinker MC+ • OBDLink LX and OBDLink MX+ • Vgate iCar Pro • Veepeak / OBDCheck BLE / OBDCheck BLE+ • BlueDriver • Carly adapter • Nexas NexLink • Most generic ELM327 Bluetooth / Wi-Fi OBD-II scan tools If your dongle speaks ELM327 AT commands over Bluetooth, OBD Master Pro is built for it. Pair the adapter in Android Bluetooth settings, open the app, tap to connect. CHECK ENGINE LIGHT — FROM SCAN TO CLEAR When the malfunction indicator lamp (MIL) turns on, scan Diagnostic Trouble Codes in one tap. See Powertrain / Chassis / Body / Network codes with severity tags, read freeze-frame snapshots from the moment the fault set, then clear all DTCs after you fix the cause. Clearing codes does not repair the car — it resets the lamp so you can confirm the fix. LIVE DATA LIKE A DEALERSHIP TOOL Watch SAE J1979 PIDs update in real time. Gauges for RPM, vehicle speed, coolant temperature, engine load, boost / MAP, estimated power and more. Graph speed, throttle and RPM together. Run a 0–100 style sprint. Log trips. Export CSV when you need a record. PRO TOOLS ON YOUR PHONE • Health report with PDF export • Battery / ATRV charging status • Turbo and boost test (MAP, barometric, estimated power) • Warning lights (MIL, battery, temperature, oil, charge) • Freeze frame data • O2 sensor voltages (Mode 05 / PIDs 14–1B) • I/M readiness monitors for emissions tests • Fuel system open / closed loop status • Mode 09 vehicle information (VIN, calibration) WHO IT IS FOR DIY owners, tuners, used-car buyers, fleets and independent shops who need an honest OBD2 ELM327 app: read codes, live data, readiness and freeze frame without a $400 handheld. WHAT YOU NEED • A 1996+ gasoline (or supported diesel) OBD-II vehicle • A Bluetooth ELM327 or compatible OBD2 adapter plugged into the OBD-II port (usually under the dash) • Android Bluetooth permission to find nearby adapters This app is a diagnostic aid. It does not replace a qualified technician. Always diagnose the root cause before clearing codes. Some vehicles and cheap clone adapters vary in protocol support (ISO 15765 CAN, KWP, PWM, VPW). Download OBD Master Pro and turn an ELM327, vLinker, OBDLink, Vgate or Veepeak adapter into a full OBD2 code reader, live-data scanner and check-engine reset tool.