MERCEDES BENZ SERIES
No.	Product Name	OEM	Application
P140010	PDC Parking Sensor	A0009052402   A2215420417	Mercedes Benz
P140020	PDC Parking Sensor	A2125420118	Mercedes Benz
P140030	PDC Parking Sensor	A2125420018	Mercedes Benz
P140040	PDC Parking Sensor	A0009050242	Mercedes Benz
P140050	PDC Parking Sensor	A0009050342	Mercedes Benz
P140060	PDC Parking Sensor	0015427418 0045428718 0035428718	Mercedes Benz
P140070	PDC Parking Sensor	0005425418	Mercedes Benz
P140080	PDC Parking Sensor	0015425918	Mercedes Benz
P140090	PDC Parking Sensor	A1695420518	Mercedes Benz

A sensor is placed on the rear bumper of the car, which is capable of both emitting and detecting ultrasound. As it pulses, a computer measures the time it takes for the sound it emits to be heard again. Parking sensor operate at a close range and some sensors have a minimum operating range. When the user set distance threshold is passed, the sensor will emit an audible sound alerting the driver that it is getting close to an object. the distance thresold is useful for those who may want to leave more room behind their vehicles, and those who like to squeeze in as tight as possible. Some more expensive models may also have an extra unit inside the car which can also visually alert the driver.