Parking sensor advice please

[Bandit12]

Been driving my C5 exclusive automatic for a few months now and love it!

However I noticed an intermittent fault with the reverse sensors. Occasionally on selecting reverse the warning module gives a constant tone regardless of how far away or close I am to any rear obstacles. This tone does not change until a forward gear is selected when it turns off. Sometimes selecting reverse again it will work properly and sometimes not.
Was wondering if this was a common prob that can easily be fixed ( a sticky switch which can be cured with a quick squirt of WD40 he asks hopefully:-)). When Ben 82 put the car on his lexia a couple of months ago we did not notice any error codes relating to it.

I have noticed the problem was quite frequent when I first picked up the car and is now very occasional but still annoying.

Any help/ideas are always gratefully received

Bandit

[qprdude]

I take it you have cleaned the sensors from road dust etc. Don't know if yours are distance adjustable or not' but I think mine are on the x7

[Bandit12]

Yes the parking sensors are regularly cleaned along with rest of the car. The distance is fixed to give intermittent beep from 1.5 metres and a solid beep from half metre.

It had a tow bar fitted professionally last year. Got lots of paperwork from some towbar and caravan specialist giving towbar and fitting costs and even got some wiring diagrams thrown in. I do not think the tow bar is an issue as the system works properly most of the time just plays up occasionally.

Bandit

[qprdude]

Someone on here had an intermittent problem too, but only while reversing down his drive. I think the sensors might have been tilted slightly downwards, and were picking up a response from the ground where the end of the drive changed angle to meet the pavement. My system shows which sensor is tripping the alarm, which means I know if one is not performing correctly.

[Ben82]

Random thought, could it be something that's cured by the good ol' curer of a lot of electrical ailments...the BSI reset?

Can't remember if it's something handled by the BSI or not though.