After replace of secondary air injection pump and clean of valve/hose

[ciaka]

Replaced the pump bank 2 with new OEM one. Cleaned out the valve and hose.

Reset the car to clear the CEL.

That was about 5 days ago. Today, CEL back on.

Checked and same error was on - P0492.

Rechecked hose connection, clear.

Rechecked electrical connection and cleaned with contact cleaner and blew dry. Check.

Reset system again.

Any ideas on what could be going on here? Is there a fuse for air pumps that could be bad from when blades were all broken up?

Help is needed and greatly appreciated.

[Ahsai]

Pretty detailed diagnostic steps and info in this thread http://www.renntech.org/forums/topic/35578-04-cayenne-turbo-p0492-codesecondary-air-injection-bank-2/

Edited May 15, 2014 by Ahsai

[ciaka]

got the sucker.

Located fuse in manual for secondary air pumps.
They are located in engine compartment (next to brake fluid reservoir).
Open the lid, and look for:
Fuse 3 - sec. air pump bank 1 (pass side)
Fuse 4 - sec. air pump bank 2 (driver side)

Mine was bank 2 (driver). Pulled out and seemed OK until I looked very closely and observed black residue on inside of plastic cover.
Checked with ohmmeter and confirmed lack of continuity. Fuse blown.
Checked fuse 3 and confirmed it is OK with Ohmmeter (near zero resistance).

So now I will have to hunt down a 40A fuse for this sucker to confirm the final fix.

Moral of the story - check your fuse too.