They are low-cost units that can do anything a standalone OBDII unit can do at a much lower cost.
They are also simple to use with many Apps available for both Android and Apple smartphones.
The ELM327 is one such unit that connects to a phone over WiFi for communication. There is also a Bluetooth unit that simply communicates over Bluetooth instead of WiFi.
This makes it compatible with both Android and IOS devices since it shows up in the WiFi settings of a phone.
There is also many other Apps with Torque simply being the most widely used.
How To Use the WiFi OBDII Scan Tool with a Smartphone
- The first thing to do is download the Torque App from the Google Play store.
- Next plug the OBDII WiFi adapter into a vehicles OBDII port and turn the key on.
- Go to the phones WiFi setting and connect to the adapter which is named WiFi_OBD
- After connecting to the smartphone via WiFi open the App.
- Once the App and smartphone are communicating it will be ready to read and clear engine codes.
I used an Android smartphone to test the unit but Apple phones can also be used with the OBD Auto doctor App, or OBD Fusion App.
There are two version of the Torque App with both a free and paid versions.
Use the free version called Torque Lite first since it can read and clear codes and is free to use.
All cars and trucks built after 1996 have an OBDII port that can be used to troubleshoot a problem.
Some manufactures have add to the basic OBDII protocols to give more detailed information, but all 1996 and newer cars and trucks will have the basic OBDII protocols built-in.
For example, VW added what is called Vag-Com which added more detailed coded that are VW specific but still have the basic OBDII codes for troubleshooting.
Sometimes the App will need to be setup for WiFi and may be on Bluetooth. This happened to me with the Torque App.
To change this with Torque click the Settings Icon at the bottom left and go to Settings–>OBD2 Adapter Settings–>Connection and choose WiFi.
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Read More Reviews Here on Amazon
ELM327 Wifi OBD 2 OBD2 Fault Code Reader OBDII Scanner Adapter Car Diagnostic Tool for iPhone IOS Android Windows Vehicle Auto Check Engine Light for Cars
The WiFi Diagnostic scan tool is a very good budget unit that I plan to get much more use from.
There is much more information an app can give bedsides simply reading and clearing codes, such as showing oil pressure, temperature and much more.
So far the unit has been working very well for me. Of course, be sure to read other reviews to be sure it is a good unit for you.