Where to find the ambient air temperature sensor?

The ambient temperature sensor is location on the lower portion of the front bumper more toward the driver side. Its is usually mounted the lower grille area and has a pointed cone shape. Inspect the electrical connector and wiring this sensor can get abuse from road debri and curb damage. As for the check engine light have you had the vehicle scanned for the check engine light (most auto part suppliers will do this for free), if so what is the code?

Check out the diagrams (Below)

Please let us know if you need anything else to get the problem fixed.

Cheers

Hold on. You took advice from a parts salesman. Diagnostic fault codes never say to replace parts or that they're bad. They only indicate the circuit or system that needs further diagnosis. This is especially true with this circuit. Temperature sensors have only one electrical component inside so failure is almost unheard of in any brand. It is much more likely there is a wiring problem like a corroded or stretched terminal in a connector or a cut wire.

Also, based on your comment about the grille, it sounds like you're looking for the wrong sensor. There may be one near the grille for an inside thermometer, but that isn't monitored by the Engine Computer and won't set a fault code or turn the Check Engine light on. You need the intake air temperature sensor that is part of the emission controls and fuel injection systems. It may also be called the charge temperature sensor. That will be somewhere in the fresh air intake hose or the intake manifold. It should be pretty easy to get to.