^^ Thank you for the info...it's very timely!
Just had my aircon regassed today as I found it was so ineffective. I hoped it was just low gas, but had read about the sensor issue, so thought I would re-gas first & then ready my wallet for £50 for a new sensor.
My car has had a replacement aircon pump under warranty, but not under my ownership (car is an '08 model).
I was told there was no gas in the system when they (re)filled it, but they couldn't see a leak. I was told there is a fault code from the pressure switch, so left feeling reasonably ok that it was 'just' a sensor.
Parked up at home and could hear a high pressure leak from the car after it was turned off - could only be coming from the air con system.
At least they have added dye so we can see where the leak is.
This is starting to sound expensive...