Could be wrong but as I recall if you just unplug w/o reprogramming the dash light will give you a fault.
A little more detail...on my '99 - the fault will clear after the car is turned off (so no spoiler fault on the next power on) but it will return if the car reaches 75mph when the ECU tries to raise the spoiler and stay illuminated until the power is turned off.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor