Reverse sensors module

[ishaanmalhotra]

I have a e85 Z4 2.0
When I put the car in reverse, my sensors give a long continuous beep and then stop beeping.

Is it due to the reverse sensor module ? if yes, where is the location of the module in the car so that I can replace it

 

[srhutch]

More likely just one sensor.

Put the ignition on and in reverse and put your ear to the sensors. The one not making a noise has the issue.