If this "Temp II" sensor is the one that plugs into a flange on the
coolant line, I assume it is technologically very similar to the ones VW
used on the Digifant A2 Jettas (I owned a '91) and this sensor would
routinely fail every 12 - 24 months and yes I did get some replacements
that were bad out of the box.  Though in that car the failures were very
difficult cold starts and rough running/low power until warm (I think it
thought the engine was already warm and it did not provide the cold
start enrichment).

Allan
--
1991 Vanagon GL