How to Install ELM327 Bluetooth OBD Scanner on Windows
Posted by Alex (Im) E. on 27 December 2012 06:03 PM
elm327 bluetooth
elm327 bluetooth

Common ELM327 Bluetooth OBD Scanners

This article will guide you how to pair ELM327 Bluetooth scanner on your Windows system. (Instructions for MAC users).

It will then successfully work with any OBD-II software (like award-winning TOAD).


Other Resources:

   >Instructions for ELM327 USB Cable
   >Instructions for pairing ELM327 Bluetooth on your Android Phone/Tablet


STEP 1: Plug Bluetooth into Car's OBD Port

It looks like this...

obd-ii dlc connector

obd port car

Car's OBD port is usually found on the driver side dashboard under the steering wheel...

location of car obd dtc port

Can't find car's OBD port? Locate it here.


STEP 2: Turn ON Car Ignition

This is one step before engine is powered.


STEP 3: Add and Pair ELM327 Bluetooth to Windows


Right click on Bluetooth icon in task manager > Add a Device

bluetooth elm327 add



Select ELM327 Bluetooth device. It'll come under different names like: OBDII, OBD-II, VLink, Can OBDII, etc.

NOTE: It can take up to 15 seconds for Bluetooth signal to show.


  1. If signal does NOT show, then exit the screen. Disconnect ELM327 Bluetooth from car. Then insert it again into car's port, and do another "Add a Device".
  2. If signal STILL doesn't show, then restart computer, and do another "Add a Device". Repeat these suggestions in variations until signal eventually shows. Because as long as the red Power light is lit on the ELM327 Bluetooth device, it means it's physically working, and MUST be detected.
  3. WORD OF CAUTION: Any attempt to detect ELM327 Bluetooth after pairing it for the FIRST time — may NOT show inside "Add a Device" anymore. In this case, it's found inside "Show Bluetooth Devices".





When you see list of pairing options like this:


(For Windows XP users, your option will be: Use the passkey found in the documentation)

Enter the pairing code:

Pair code: 1234

If above doesn't pair, then: 0000





Additional Step for Windows XP Users

Once it's paired, the wizard will display COM port numbers:

bluetooth elm327 adapter

Write down the number of the Outgoing COM port. You will need it later to configure the OBD software.



STEP 4: Launch OBD Software and Connect to Vehicle

Launch OBD Software. (We recommend professional TOAD software which is 100% compatible with Bluetooth.)

Click "Connect" and it should automatically detect ELM327 Bluetooth device, and connect to car's ECU.



Troubleshooting Connection Issues:

If OBD software has trouble connecting to your car, then set baud rate of connection to: 9600 or 110. Hopefully the software you're using has this option inside it's Settings. For example TOAD software has option to force 9600 bits per second, which instantly fixes random disconnection issues.

If your OBD software doesn't have option to limit connection speed, then you can also limit it through Windows settings. Here's how...

  1. Go to Device Manager > and expand "Ports (COM & LPT)".

    Windows XP:

    Control Panel » System » "Hardware" tab » Device Manager » Ports (COM & LPT)

    Windows Vista/7/8/10:

    Control Panel » System » Device Manager » Ports (COM & LPT)

  2. Right-click on "Standard Serial Bluetooth" (it may be a different name for you) > Properties


  3. Go to "Port Settings" tab > Lower "Bits per second" to 110. Click Ok. As seen below. Then attempt to reconnect to your car inside the OBD software.





(971 vote(s))

Address: PO Box 1315, Byron Bay, NSW 2481, Australia

facebook-social linkedin-social youtube-social

Copyright © ,, All Rights Reserved.

sae memberNRMA Approved
TRUSTe Certified Privacy Seal