by 
The Curious Bag
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A car's speed sensor monitors how fast your car is going. This sensor relays the information to your speedometer so you can gauge your speed, according to Car Parts Wholesale.
History
Speed sensors and speedometers were once optional equipment on new cars, according to Car Parts Wholesale. Sensors now are required, and they can measure both speed and how quickly your speed changes.
Location
Engine speed sensors can normally be found on the crankshaft. Each wheel may have its own speed sensor.
Maintenance
A faulty speed sensor could compromise your car's performance or get you a speeding ticket, according to Car Parts Wholesale. Wipe away grime that has collected on your speed sensor.
Newer Cars
Newer cars may now use speed sensors to regulate power steering and your brake system, according to Engine-Light-Help. As computer systems become more complex, speed sensors are used to monitor more parts of your car.
Problems
You may be able to diagnose problems with a faulty speed sensor. Use a scan tool to see if the computer detects a problem.
Source:
Car Parts Wholesale/Speed Sensors
Engine-Light-Help/Vehicle Speed Sensor Description & Related Information
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