Here are our favorite OBD2 WIFI scanners for iPhone and iPad From there, you can see if it’s going to be a simple mechanical fix that you can do yourself, or if it’s time to visit your friendly neighborhood mechanic. Have you ever wondered why that Check Engine light is on? Well pick yourself up an OBDII scanner for iPhone, connect it to your OBDII port, and start pulling DTC’s or Diagnostic Trouble Codes without paying big money at the dealership. These OBD2 WiFi scanners will really let you put your Apple smartphone to good use. Hello! Mike here from to bring you our list of the cheapest and best OBD2 iPhone Scanner. How can a WiFi OBDII scanner save me money?.Which OBD2 app should I use for my iPhone?.Here are our favorite OBD2 WIFI scanners for iPhone and iPad.