Funny (not very) sensor readings (fault to 0v)

So I am in the process of investigating this issue with my car where I get limp mode under certain circumstances. There is a long-winded thread about it separate to this but I wanted to keep these more focussed questions shorter and sweeter!

My issue doesn't appear to be specific to one sensor, more a group of sensors, however one of the codes I intermittently get is P007C (Intake air temp).

Now, when I monitor the behaviour of this sensor on the oscilliscope function in FORScan I get this peculiar behaviour.

Usually the IAT sensor (CACT - voltage is turquoise in the photo) gives readings between about 2.8 and 3.5v and it does behave normally for most of the time. Under certain conditions however = (>40mph, accelerating, engine warm), the sensor starts spiking down to 0v in this strange pattern, I then get the codes & limp mode... If I unplug the sensor completely I get steady 5v.

In the photo attached, you can see the strange behaviour that occurs during the period when I press the throttle (Marked in yellow).

I have ordered a replacement sensor, and a replacement PCM (ECU) is on its way as well as those are possibilities I was considering. I've tried wiggling everything around, shaking and wiggling the loom etc etc to see if I can replicate the behaviour but nothing.


My question is - what could cause this sensor to fault to 0v in such a pattern.