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I guess a used vehicle isn't covered under the Lemon Laws - but since it's a diesel, you may be in line for Porsche to buy it back from you due to dieselgate. There is a longish thread on this subject if you have several hours to waste reading it:

http://rennlist.com/forums/porsche-c...ion-issue.html

 

No help on the check engine lite front (although I went through similar issues with my 2013 S recently), but just to point out that in California consumers apparently do have protections under the Song-Beverly Act for used cars IF the manufacturer's warranty (either original or extended/CPO) is in effect when the problems occur.

Not sure if this applies in your case, but if so you might want to talk to a lemon law lawyer about it. Even if the car is running fine, I'd suspect the light qualifies as a serious defect in that:
a. The car would not pass smog with it lit (admittedly the diesels have a whole additional set of challenges on this front)
b. It might indicate a problem that would cause further damage, for which you'd be on the hook, if you continue driving the car.

Good luck.

 

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Interesting that the coil light on the dash lights up all of the time on yours...I never see that light on my dash...even when the car has sat outside in -3 degree temps. The MFD on mine will on cold-start mornings say "Engine Starts" while the glow plugs fire off. the longest that has shown on mine has been 2-3 seconds before the engine fires over.

 

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