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Hello, this is my first post for my newly aquired 520i SE Automatic 2000/X (facelift model). The car runs fine and is a dream to drive but the only problem I have is with the parking sensors.

After reading several posts I carried out the "clicking" test by placing my ear closely to each sensor and listening for the "clicking" sound. I found one sensor not to be "clicking" so I replaced this with a used one from my local BMW breaker and Voila! Parking sensor system was working :)

A few days later unfortunately I got the dreaded long beep again when I selected reverse gear and once again I did not have functioning parking sensors. It did work again briefly when I reversed into my local KFC! ;-)

I did the "click" test once again and all sensors are "clicking" fine. Before I take the car and my wallet to get a diagnostic check done what else do I need to look at?

Someone said that it could be a broken wire but if this were the case would the sensors not then "click"? Any help or advise would be greatly appreciated,

Anesh.
 

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Getting long bleep because sensor thinks one of sensor thinks obstical is near so one of sensors is faulty, is working but faulty. need going on diag machine and do distance test on sensors.
 

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Discussion Starter #4
Thanks guys, I will go and get a diagnostic check done next week and post the result here,

Anesh.
 

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I found a way to test these yourself when I had a sensor stick on like yours it might work for you.
I removed all 4 sensors and re-connected but only lightly balanced them in the mounting holes (for some reason the sensor would not show a constant bleep when I switched on the PDC manually once I had disconnected and reconnected) It might just do this anyway if the cars been stopped for a while.
Then approach each sensor and when the faulty one is approached it wont stop bleeping, because they are loose you can quickly test over an over or move the suspect sensor to a different location. Just a thought are they painted ? if so flakey paint can cause a constant signal I was told (but it didn't hold true on mine)
 

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Discussion Starter #6
I found a way to test these yourself when I had a sensor stick on like yours it might work for you.
I removed all 4 sensors and re-connected but only lightly balanced them in the mounting holes (for some reason the sensor would not show a constant bleep when I switched on the PDC manually once I had disconnected and reconnected) It might just do this anyway if the cars been stopped for a while.
Then approach each sensor and when the faulty one is approached it wont stop bleeping, because they are loose you can quickly test over an over or move the suspect sensor to a different location. Just a thought are they painted ? if so flakey paint can cause a constant signal I was told (but it didn't hold true on mine)
Thanks but I saw this post too late :frown I took the car for a diagnostic at a BMW specialist who said the rear nearside centre was the faulty one (although it still "clicks") and the rear offside corner was not so strong but still working. I ordered a couple of these rear sensors from FAB this morning (£40+VAT for both) and they are on their way!

After this, I got into my car and would you believe it, parking sensors working! Could this be down to the hot weather we are having? I read somewhere that putting the sensors under a heat lamp can fix them?

I will leave them as they are until they fail again when I will then try the heat lamp cure. If that does not work then I will fit the ones I ordered from FAB. Will post any new findings.
 
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