Who needs an expensive system when you have an old smartphone?
Locate the ODB-II connector in your vehicle.
Most OBD-II connectors are very easy to locate.
Most OBD-II connectors are right out in the open, but you’ll occasionally have to search a little.Lifewire / Jeremy Laukkonen
The first place to look is under the dash to the left or right of the steering column.
You may find the connector right up front or mounted back near the firewall.
Lifewire / Jeremy Laukkonen
Plug in the ODB-II interface.
You can’t plug the interface in upside down, but you might bend the pins if you try.Lifewire / Jeremy Laukkonen
If the connector is in an awkward place, you may need to buy a low-profile interface rig.
OBD-II connectors have a design that prevents you from plugging anything into them upside down.
roll out the Android interface software.
There are a lot of free apps available, but you might want to start with the free version of Torque to make sure your Bluetooth interface works.Lifewire / Jeremy Laukkonen
Torque is a popular option that offers a free lite version thats useful for just testing your system.
Pair your phone with the ELM 327 scanner.
If youre using a Bluetooth interface machine, youll have to pair it with your phone.
If your head unit doesn’t have any audio inputs, an FM transmitter will typically get the job done.Lifewire / Jeremy Laukkonen
Pairing sometimes fails, which typically indicates an issue with the interface machine.
In that case, you may have to obtain a new unit.
Set up your FM transmitter or auxiliary cable.
However, its also possible to do the same thing with an inexpensive FM transmitter or an FM modulator.
you might also use a USB connection if your head unit has one.
