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P0491-Secondary Air Injection System 2004 Cayenne S

jrgcom
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jrgcom Member

jrgcom

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My 2004 cayenne S with 188,000 (I am original owner), has a code P0491 which I determined was a blown fuse for Bank side 1 (passenger side of car). I replaced fuse and it has blown our immediately upon cold startup. What should i explore to find the culprit? Also, I added tires yesterday to the rear,  and I now have  a flashing PSM on dash when rpm is above 4000 or above 60 mph, in stop and go traffic, I noticed if I speed up to about 20, slack off throttle, there are a couple of clunk sounds coming from the rear of car (does not appear to be shifting on the display, only on occasion it has a hard shift, does this in manual and drive). Does this relate to a P0491 code? 

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