Can anyone tell me what this is?

[ukdan]

Done a oil service on my car today and found a sensor/switch hanging down resting on the undertray.
Looks like it goes on the left hand engine mount.
Here is a pic of it back on the mount.....

[ukdan]

oops forgot to say, A4 2.0 TDI 2005 s-line 140bhp

[ukdan]

Anyone?

[sidewinder306]

I think the engine mount includes a vibration sensor. Not sure what it interfaces with though.