Same issue happened to me but I did smell coolant briefly. I pulled over and looked around the trunk and under the car but I did not see any leaks. After about 5 minutes I restarted the car and the light never came back on.
When I got home I was a little low on coolant. Maybe 1/2 quart so I filled it to full level. Just for a precaution I replaced the coolant cap. The light never came back on. I even took the car on a 3000 miles road trip through Nevada and Utah desert and Colorado Pikes Peak. The light never came back.
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2008 Boxster S PDE2
02 Boxster S Blk on Blk(Stock for the Wife)
88 turbo S (My Toy) slightly modified
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