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P0491 Secondary Air Pump Question

Posted 9th February 2008 at 21:22 by Logle
Hi all,
I have the infamous code P0491, and have been troubleshooting the secondary air pump system on my 02 M5. Took the cover off and verified the pump is working at startup. In fact it would not stop on its own. I unplugged the connector (while running), then plugged it back in and the pump stopped running. Is this normal? I thought the pump was supposed to stop after about 15 seconds on its own. Could this be a problem in the valve? Any help would be appreciated but otherwise the car runs great!

Thanks,

Bob in Austin
02 M5

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