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Normal the Secondary Air Injection pump is a pollution device that helps light the cats quickly. If the fan is really LOUD it might need to be disassembled and cleaned. Search the web for cleaning 996 SAI fan. If it fails a new one is available from Bosch, you have to reuse the Porsche bracket, for under $300 or the same one in a Porsche box is available for ~ $1,100.
When you unplug it you will get a CEL. Plug it back in and after a number, 1 - 100?, Of successful starts the light should reset.
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
Last edited by FPB111; 10-14-2017 at 02:38 PM..
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