BMW Z4 2006 What's making this chirping sound whilst engine on?



It appears to be coming from the dash area. Mechanic took a look at the engine and said it wasn't that and seemed like something in the dash area. I took it to the garage as I noticed when coming to a stop at lights, I would have to downshift earlier than usual, failing to do so would cause the car to stall. This happened once ad the engine light stayed on in amber. I cleared the codes and it's not come back since.
Any insight would be grately appreciated.
Cheers
 
We had a similar thing on our Ford Focus a few years ago, turned out to be the fan belt, had it changed and the noise went away.
 
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