There is no sensor in the mount, only valve. At idle valve opens to allow liquid in the mount move more freely and absorb vibration. Under load valve closes to reduce engine movement. I think by default valve is closed so if it has failed you will have more vibration at idle but it's hard to notice. Sometimes it's just corrosion in the plug.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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