Hi BobBob Lincoln said:OK.Code 23 - Air charge temperature sensor out of rangeThis is a small thermistor (variable resistor) that is mounted in the throttle body, and it's used only on cold engine starts. It senses the cold air and adds a little extra bit of fuel. There are two wires running to it. Check the wires to be sure it's connected and the connection is clean. If it fails, it should cause no harm.