Kia Optima: Measurement PointMeasurements should be taken at the center of the hole.

Measuring Actual Dimensions
Checking Cables And WiresHorn
To sound the horn, press the horn symbol on your steering wheel.
Check the horn regularly to be sure it operates properly. ...
Inspection
1.
Ignition "ON"
2.
Using the scan tool.
3.
Emit intensive light toward photo
sensor using a lamp, and check the output voltage change.
...
Troubleshooting
Symption
Suspect area
Remedy
Engine misfire with abnormal internal lower engine noises.
Worn crankshaft bearings
Loose or out of s ...