Insignia CDTi Tyre Pressure Sensor

[chrisnj]

Hi,

Apologies if this has been asked/mentioned before, I did a quick search and didn't find anything.

It looks as though one of the tyre pressure sensors on my work insignia is dying. After a few miles I get the message "Service Tyre Monitor System" together with the associated puncture light flashing. If you then cancel this and look at the tyre pressures, the offside rear isn't showing a reading.

My guess is that the sensor is dying, does this sound about right? Anyone know how much a new sensor/valve costs, and do I need to replace all 4?

Apologies if the questions are a bit obvious.

Thanks
Chris