986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post

thom4782 · 12-08-2012, 08:43 AM

I chased the P0410 and P1411 based CEL problem in my car for a year. I took the car to two independents. The first replaced a lot of parts for $$$. The problem persisted. The second spent a number of hours smoke testing and ultimately suggested that I take it to the dealer. Finally, the dealer found and solved the problem.

I think the dealer succeeded because it tested the system to see if it could hold a vacuum in the first place. It turned out in my car that the vacuum reservoir was the problem area and the CEL problem disappeared once it was replaced.

My experience suggests that one find a way or have a shop test to see if the secondary system can hold a vacuum before beginning to change out parts. If the vacuum can't be held, then it's likely a tube, connector, or the reservoir is where the problem lies. If a vacuum is held, then the seconday air system has a bad valve, is clogged or something else outside the seconday air system is causing the bad readings.

12-08-2012, 08:43 AM	#12
thom4782 Registered User Join Date: Sep 2010 Location: Foster City CA Posts: 1,099	I chased the P0410 and P1411 based CEL problem in my car for a year. I took the car to two independents. The first replaced a lot of parts for $$$. The problem persisted. The second spent a number of hours smoke testing and ultimately suggested that I take it to the dealer. Finally, the dealer found and solved the problem. I think the dealer succeeded because it tested the system to see if it could hold a vacuum in the first place. It turned out in my car that the vacuum reservoir was the problem area and the CEL problem disappeared once it was replaced. My experience suggests that one find a way or have a shop test to see if the secondary system can hold a vacuum before beginning to change out parts. If the vacuum can't be held, then it's likely a tube, connector, or the reservoir is where the problem lies. If a vacuum is held, then the seconday air system has a bad valve, is clogged or something else outside the seconday air system is causing the bad readings. Last edited by thom4782; 12-08-2012 at 08:45 AM.