SINCE 2004--Professional Auto Diagnostic Factory

ELM327 Bluetooth devices provide an easy way to scan an OBD-II system for codes, read PIDs, and aid in diagnostics. These devices 

represent a low cost way for DIYers to tackle computer diagnostics, and they can even be useful to seasoned techs who find themselves 

away from their dedicated scan tools. However, there are a few ELM327 Bluetooth-related issues that it’s important to be aware of. 

Low-cost devices that include unauthorized ELM327 microcontroller clones often exhibit strange behaviors, and even legitimate hardware 

will fail to work with certain devices.

Pairing ELM327 Bluetooth Devices

Aside from the situations outlined above, pairing ELM327 Bluetooth devices with smartphones, tablets, and PCs is typically a simple 

procedure. The most common steps are:

Plug the ELM327 Bluetooth device into the OBD-II port Set the smartphone, tablet, or laptop to “scan” for available connections Select

the ELM327 scan tool Input the pairing code, In most cases, the documentation that comes with an ELM327 Bluetooth scanner will include 

the pairing code and any special instructions that differ from that basic outline. If no documentation is included, some common codes include:

0000

1234

6789

9999

If those codes don’t work, other sequential sets of four numbers are sometimes used.