P0410 and P1411 Solved
 

I was getting the P0410 (Signal Implausible Cylinders 1 - 3) and P1411 (Signal Implausible Cylinders 4 - 6) codes indicating a problem with the secondary air injection system.

Looked into the possible sources and it looked like this was going to be hard to diagnose down to one component and the likely components all looked hard to reach so I took it into my local indy. He found a leaking vacuum hose and cracked vacuum reservoir. CEL gone.

http://i1114.photobucket.com/albums/...ne/EvapRes.jpg

Wonderful news! Thanks for posting this. Others will find it and save time and money diagnosing it...

Good deal. Thanks for posting this. Who is your indy?

I had the work done at House Automotive in Pasadena. Greg Hwang is the owner. Great staff and they do very good work.

Pasadena Porsche Repair | Porsche Maintenance Woodland Hills | Transmission Repairs ?House Automotive

Thanks for the info. I've been having the same code pop up once in awhile and I have a new one of those. It came with the car lol. I didn't know what it was.
Question: can you point out where it is located?
Thanks in advance

I ended up replacing all the hoses and the reservoir. The hoses looked perfectly fine until you removed them and checked closely at the bend. Ad of course the reservoir crack is so difficult to see unless you put it under high power light and use magnifying glass. Guess you could pressurise it to test as well.

Its kind of buried in the engine which is why I decided not to DIY it (is DIY a verb? I guess it is for me!). What I read is that you can get to it from the top of the engine by removing the passenger side intake manifold or go through the engine service panel behind the seats and remove the alternator.

Of course, there are several other components that can also cause this pair of CEL's like the change over valve or the check valve. Or it could just be a leaking hose/line.

Here is a reference diagram: Porsche Boxster Air Injection Parts

Here is a photo (courtesy of our sponsor) showing the reservoir with the red arrow. The passenger side intake has been removed and the reservoir is behind the alternator.

http://i1114.photobucket.com/albums/...one/VacRes.jpg

Here is a really detailed video showing how to diagnose and fix this:
And links to cheap new parts

https://youtu.be/go34DJAuPyg