Remove the engine intake air temperature sensor for inspection and replacement.
Removing the engine cover (see Checking the condition and replacing spark plugs).
With the ignition off, by pressing the spring retainer of the engine control wiring harness block..
... disconnect the block from the air temperature sensor.
Using the "21" head, we loosen the sensor tightening..
... and turn it out of the threaded hole of the intake manifold receiver.
Install the intake air temperature sensor in the engine in reverse order.