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P1411 trouble code
My boxster also had a P1411 trouble code ,secondary air injection system-signal implausible (cylinders 4 thru 9). I did some trouble shooting and checked the Air change over valve PT#993-113-245-01 with a hand vacuum pump , unit would not hold vacuum .I also verified that there was a vacuum signal going to the air change over valve from the electric change over valve and that all the vacuum lines were intact and not cracked. I replace the defective air change over valve and cleared the CEL and the code has not returned over a year later. Hope this might help .
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