The temperature sensor was always a known weak spot, and there used to be regular issues reported on here in the early days of the RCZ.
I haven’t seen that much of a problem reported with it recently, and I had thought maybe they had sorted the issues connected with it. Perhaps they are fitting a modified part when replacing the sensor, as appears to be the case with several parts that have had known problems, timing chain tensioner, front suspension strut top mounts to name a couple.
It does seem that the likely fault is with the sensor, which shouldn’t involve a massive cost. (You could always mention that as it I still a known issue, would Peugeot be prepared to contribute to the bill). Worth a try. :eusa-think: