Hi, my 2009 Superb rear sensors started playing up in the winter, with sometimes on/off, 3-second beep etc.

Just wondering if there is any other route to fix them other than main dealers?

Thanks.

Possibly water ingression. VCDS might tell you which sensor it is. If you don't have access to VCDS, then when the sensors are behaving themselves, lie in the boot and place a hand in front of each sensor, if one doesn't cause a beep then that's your faulty one.

Options would be to whip the bumper, spray the sensor with WD40 to expel the water. Most likely it will need a replacement sensor. Check the part number off the sensor and order one from ebay, etc.

Good luck!

Thanks for the reply mate. I'll try and get some to do VCDS on it.

Possibly water ingression. VCDS might tell you which sensor it is. If you don't have access to VCDS, then when the sensors are behaving themselves, lie in the boot and place a hand in front of each sensor, if one doesn't cause a beep then that's your faulty one.

Options would be to whip the bumper, spray the sensor with WD40 to expel the water. Most likely it will need a replacement sensor. Check the part number off the sensor and order one from ebay, etc.

Good luck!

I'm assuming that when the system discovers a fault it shuts it off anyway, so when the sensors are behaving themselves surely they will all be working anyway? If that makes sense.

I currently have the same problem with my 07 superb, annoyingly I had the bumper off about 3 weeks ago when I fitted a tow bar.

I'll have to get it plugged in as I'm struggling to identify the faulty sensor, I know on my old BMW a good working sensor would emit a buzzing noise so it was easy to identify the faulty one.

Yes it makes sense.

If the system recognises a sensor as faulty then when you engage reverse for the first time after turning on the ignition it will emit a long solid beep which is a different tone to the nornal parking sensor beep. VCDS will show an fault code during Auto-scan.

In the early stages of water ingression, the system may function but the faulty sensor might think that it is right next to an object and give off a long contiuous "standard" parking sensor beep even when you're nowhere near anything. However, when the car gets close to a real object, one of the other sensors picks the object up and causes beeps at a frequency. It's during this stage that a VCDS scan will not show an error, but the lying in the boot method will find the faulty sensor.

Another way to check if there is a faulty sensot is to engage reverse with the car not started and get very close to each sensor, one at a time, you should hear the sensor clicking very faintly. If you can't hear the clicking on one of them then that is the faulty one.

Ian