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A Google search turns up that it is "insufficient coolant temperature" for another make of vehicle, however it should be the same for your Cayman. What was the ambient temperature? The solutions discussed in the Google search for the Mazda 3 were replacing the thermostat.
 

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A Google search turns up that it is "insufficient coolant temperature" for another make of vehicle, however it should be the same for your Cayman. What was the ambient temperature? The solutions discussed in the Google search for the Mazda 3 were replacing the thermostat.
Yup, this is not a manufacturer specific code:
P0126 - OBD II Trouble Code
Generic OBDII Codes Part 1 & 2 (P0001 to P3493) - Rennlist Discussion Forums

Thermostat stuck open is the most probable cause.

Let us know what the fix is once you get your car back.
 
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