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So the first time I took my car for a drive after winter break - I've got this weird cooling system fault message. Not my picture and not 981, but the same exact message:
First I freaked out and was thinking of calling a flatbed. Then I realized that engine sounds normal, no smoke coming anywhere, and cooling gauges stay in the usual range. So I drove with it for a day. No problems. Engine temps normal. Weird message pops up every time you start the car.
Finally I made it to the dealer. They diagnosed that "one of two vacuum censors" detected some problems with one of the vacuum valves "that are used for many things". And to get to that sensor is 3 hour / $450 job. That's just to (hopefully) diagnose the exact reason for the message. Internet wisdom says that this message is always related to vacuum hose that goes to PSE exhaust. That needs tightening. But I don't have PSE exhaust
Mechanic said they had a lot of those problems with recent 911. It's still unclear to me what getting "to that sensor" achieves and how it'll help diagnose what valve is giving the error.
After setting an appointment for this 3 hours job, it occurred to me to ask if they tried to reset the error. No they didn't. So I asked them to do it just for fun. Error is gone and I drove 120 miles after that without error reappearing.
My hope is that winter storage + air filters change might have triggered some rare condition for that error. And now everything settled and I will see the error no more.
Will keep you updated.

First I freaked out and was thinking of calling a flatbed. Then I realized that engine sounds normal, no smoke coming anywhere, and cooling gauges stay in the usual range. So I drove with it for a day. No problems. Engine temps normal. Weird message pops up every time you start the car.
Finally I made it to the dealer. They diagnosed that "one of two vacuum censors" detected some problems with one of the vacuum valves "that are used for many things". And to get to that sensor is 3 hour / $450 job. That's just to (hopefully) diagnose the exact reason for the message. Internet wisdom says that this message is always related to vacuum hose that goes to PSE exhaust. That needs tightening. But I don't have PSE exhaust
Mechanic said they had a lot of those problems with recent 911. It's still unclear to me what getting "to that sensor" achieves and how it'll help diagnose what valve is giving the error.
After setting an appointment for this 3 hours job, it occurred to me to ask if they tried to reset the error. No they didn't. So I asked them to do it just for fun. Error is gone and I drove 120 miles after that without error reappearing.
My hope is that winter storage + air filters change might have triggered some rare condition for that error. And now everything settled and I will see the error no more.
Will keep you updated.