Since the freezing weather my front parking sensors give an almost constant tone when reverse selected Almost constant because it sometimes stops for a few seconds. I have cleaned the sensors, sprayed them with WD 40 and blasted them with air. Still doing it. Don't really want to take the bumper off. But may have to. Any thoughts?

A decent code reader will tell you which of the four is faulty. Could be the sensor, or could be the loom. Quite common to get increased resistance over time with damp getting into connectors and cables getting pinched/rubbing.

Unfortunately it will still be a bumper off job once you narrow it down. Current driveway contents:
2021 V60 Cross Country B5
2009 FL2 dog bus and shooting wagon

On Order: 2023 Fisker Ocean Ultra - deposit paid.

Thanks for that. I repaired the loom a few years ago. I suspect I will have get the bumper off if it doesn't dry itself out soon. I'll make up a new loom if it has gone again.

Hi,

do you know anyone with an IID you can plug it in to see sensors working and at what distance its showing, should at least narrow down to which sensor?

does not need to be linked to your car as your not going to change anything

 .
my first ever FL2 and I did keep it longer than most other cars!
But its now gone way up Norf

Even the basic Icarsoft I930 shown PDC codes and sensor distance readings.  2009 Rimini Red SE TD4. Soon to be sold.
Hyundai Ionic 5 Ultimate on order.
Gone. 2006 Tonga Green i6 HSE.

I only have a basic multi car code reader. I may as well invest in a decent land rover specific one. £134.99 for the Icarsoft on Amazon . Is that the recommended one?

thehelper wrote:

I only have a basic multi car code reader. I may as well invest in a decent land rover specific one. £134.99 for the Icarsoft on Amazon . Is that the recommended one?

Nodge68 wrote:

Even the basic Icarsoft I930 shown PDC codes and sensor distance readings.

Yes front and rear sensors are shown on my I930.
Did you update the firmware? I've updated mine a couple of times, maybe front sensor readings have been added in the firmware update? 2009 Rimini Red SE TD4. Soon to be sold.
Hyundai Ionic 5 Ultimate on order.
Gone. 2006 Tonga Green i6 HSE.

Hi, I can see the front sensors on the scanner but it is just the option to see the distance that is missing.
I tried an update but I get a message. "No mobile storage device found... It shows up on the pc as present but the msdiag does not recognise seem to see it. Tried formatting the card, still no joy.

Sussed the scanner problem. Update the scanner straight onto the SD card.The front sensors were not showing up until I changed the car profile to a later model on the scanner . Now I can see that the front left shows 255mm distance all the time. Bumper off after Xmas.

Ok bumper off and faulty parking sensor changed. All good but a slight increase in throttle speed increases the voltage by 0.1v and the news sensor distance reading decreases from 1.8 to 0.7 and tone becomes constant. Checked all wiring. If I change the new sensor to the opposite side the fault moves with it.
Any ideas anyone?

Was the replacement sensor a genuine part?
I've had issues with aftermarket PDC sensors. 2009 Rimini Red SE TD4. Soon to be sold.
Hyundai Ionic 5 Ultimate on order.
Gone. 2006 Tonga Green i6 HSE.

No not an original. I was going to send it back and order an original. But I tried swapping it with the dead one. Dead one is still dead and the fault is still present, just that now when I increase the revs one of the other sensors reacts by registering a decreased distance and triggering a constant tone.
I think the dead sensor has been dead for some time and I only noticed it because interrogated the system because of the new constant tone fault.
I am sure this fault only started after the car had been stood covered in ice for a few days.
Sensors are definitely changing their outputs when the voltage increases. I wonder if the parking module has a voltage regulator to smooth out any fluctuations in the supply to the sensors. Could that have failed?

I'm suspecting more than 1 sensor is faulty. I would have thought the PDC module will have voltage regulation, or a way to compensate for variables in system voltage.
First off test it with a genuine sensor. 2009 Rimini Red SE TD4. Soon to be sold.
Hyundai Ionic 5 Ultimate on order.
Gone. 2006 Tonga Green i6 HSE.