ELM327 Buletooth/Wifi OBD2 Code Scanner is handle scan tool which can work with iPhone,iPad,Android. ELM327 support reading and clearing fault codes,display current sensor data including Engine RPM,Fuel System Status,Vehicle speed and so on. ELM327 also has USB version.
This article will guide you on how to install ELM327 Bluetooth OBD scanner on your Android device. (This also applies to Jailbroken iOS devices.)
STEP 1: Turn ON Car Ignition and Then Plug in ELM327 Bluetooth Scan Tool into Cars Port
FIRST Turn ON cars ignition (one position before engine starts). And only then...
Plug ELM327 Bluetooth scanner into cars connector.
STEP 2: Pair ELM327 Bluetooth Device to Phone/Tablet
(NOTE: You only have 60 seconds to pair the Bluetooth scanner from the time you connect it to the car — to the time of entering the Pairing code. If more then 60 second pass — then Pairing code will be rejected and you'll have to plug out the scanner and try again. So have your Bluetooth devices window open, so you can immediately connect as soon as you see ELM327/OBDII/Unknown Device show up.)
Touch Settings 
» Wireless & Networks » Check the Bluetooth box and go to » Bluetooth Settings.
From here — scan for devices and ELM327 Bluetooth obd scanner will show up as either: ELM, ELM327, CAN, OBD, etc.
When you're asked for passcode to pair, enter: 6789
If "6789" doesn't work, then try "1234" or "0000".
Done!
STEP 3: Launch the OBD App
Launch the OBD app you've downloaded from Google Play store or The dealer— and connect to ELM327. This is usually done in "Settings" within the App.
Example of typical Android OBD app.
Happy car scanning!
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