Porsche Repair Questions? Ask a Mechanic for Answers ASAP
Thank you for choosing JustAnswer, I am happy to assist you today. First of all i would like to sum up your concern so i can verify that i have all the information correct. Your 2011 Boxster Spyder was origonally setting a P1699 fault, and you replaced the alternator, and it is still setting the same fault, so replacing the alternator didnt effect the issue in any way.
Your fine, i was just clarifying to make sure i understood the situation correctly.
Did the previous owner tell you why the alternator was replaced? This is important because the most likely cause of this failure is a failed alternator, otherwise we have a wiring issue or a bad DME.