986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - P1411 & Bad AOS... Any possible connection?

smokey-burnout · 07-03-2007, 07:50 AM

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 .

07-03-2007, 07:50 AM	#5
smokey-burnout Registered User Join Date: Nov 2006 Location: ca Posts: 3	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 .