I just want to attempt to kill off some Internet myths again. Cleaning IAT sensor WILL NOT improve engine performance or fix any engine problems.     This right here is an IAT sensor for 98.5 to 02 Dodge Cummins 24V engine. This sensor has about 50k miles of gunk on it. This has ZERO impact on the sensor ability to read air temperature in the manifold. Cleaning the sensor will do nothing for performance or MPG. The way to check the IAT sensor for problems is with a live data