How a car works

All partsBMW M4 CSLElectrical systemDriver assistance sensors › Parking sensors

Parking sensors

Part of Driver assistance sensors · about $400 to replace

What it is

Ultrasonic sensors in both bumpers.

What it does

Measure distance to obstacles when parking.

How it fails

Paint build-up deafens them; a constant beep means one has failed.

MaterialPiezo transducer, painted cap
Spec12 sensors
2.5 m range
Parking sensors highlighted on the car

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