Your car's black box, decoded in real time.
OBD Master turns your phone into a professional diagnostic scanner. Read fault codes, watch live engine data, and run a full pre-purchase check before handing over a single dollar.
Toolbox
Everything a mechanic carries — in one app.
From weekend wrenchers to certified techs, OBD Master delivers shop-grade insight.
Live Engine Data
Stream RPM, speed, coolant temp, MAF, O2 sensors and 100+ PIDs in real time with smooth gauges & graphs.
Fault Code Scanner
Read & clear DTCs across engine, transmission, ABS and airbag systems with plain-English explanations.
Pre-Purchase Inspection
Run a one-tap health check before buying any used car. Hidden faults, readiness monitors, and history — exposed.
Performance Meters
0-60 mph, quarter-mile, horsepower & torque estimates straight from your ECU.
Session Recording
Log drives and replay sensor data side-by-side to diagnose intermittent issues like a pro.
Emissions Ready
Check OBD readiness monitors and pass smog/MOT inspections with confidence.
3 Steps
From port to plain English in 60 seconds.
Plug in adapter
Connect any ELM327 Bluetooth or Wi-Fi OBD-II adapter to your car's OBD port.
Pair with OBD Master
Open the app, tap connect, and your ECU streams live data in seconds.
Diagnose & fix
Read codes, watch sensors, record drives — and know exactly what's wrong.
For Buyers
Don't buy someone else's problem.
Sellers can clear the check-engine light minutes before you arrive. OBD Master sees through it — surfacing stored codes, readiness flags, and live sensor truth so you walk away or negotiate hard.
- Hidden fault codes the seller cleared
- Catalytic converter & O2 sensor health
- Misfire counters on every cylinder
- Transmission temperature & shift quality
- Readiness monitors (was it just cleared?)
- Real fuel trims and engine load
FAQ
Questions from the garage.
Do I need a special adapter?
Any standard ELM327-compatible OBD-II Bluetooth or Wi-Fi dongle works. Most are under $20.
Which cars are supported?
Nearly every gasoline car from 1996+ and diesel from 2004+ sold in the US, EU, and most markets worldwide.
Can it clear the check engine light?
Yes — read, decode, and clear stored DTCs across engine, transmission, ABS, and SRS modules.
Does it work offline?
Live data and code reading work fully offline. Code descriptions are cached after first use.
Stop guessing. Start diagnosing.
Download OBD Master and turn your phone into a pro-grade scan tool today.