Re: Check Engine Light - ON, PO113
IAT=intake air temperature sensor. It's located in the air intake assembly. First check for a bad connection. If that's OK, you can connect an ohm meter to check the reading against the current temp. If the reading is off, replace the sensor. If the reading is OK, it's a wiring problem back to the computer. The sensor is easy to replace. Inexpensive to buy (about $30).