this sensor is at the back of the compressor usually.

The sensors would be similar across the range of cars - I bought a compressor clutch assy for my w124 too, it was sold on ebay as S500 compressor clutch unused.. I paid 40 bucks for it and its a perfect fit - same part no too.

You can try the jyard for it. It usually is good for a long time. Most people have had klima relay or other problems.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)