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  #27  
Old 02-01-2013, 06:04 AM
Davidf Davidf is offline
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Location: Austin, TX
 
Join Date: Dec 2012
Posts: 91
Mein Auto: various BMW's
The (future) AGA secondary air port cleaning kit will only fix the "secondary air low flow" error message. The fault is generated due to carbon build-up in the heads that clog the port at the exhaust valve. The carbon build-up is due to the leaky valve stem seals. The AGA kit might allow sufficient cleaning of the ports to make head removal not necessary, but at $250 it is about the same cost as removing the heads DIY when you figure in head gasket and head bolt parts cost. Plus, pulling the heads ensure a better job of cleaning than using the AGA kit. IMHO.
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