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Old 07-21-2010, 08:32 PM   #3
shanneba
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Join Date: May 2008
Location: Indiana
Posts: 2,094
My Ride: 2003 330Ci
I found a few links when I searched yahoo with BMW P1721 and BMW P0721.

One indicated the fluid level could be low. It could also be a wiring problem to the transmission output speed sensor.
Another indicated the battery voltage could be too low.
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Last edited by shanneba; 07-21-2010 at 08:33 PM.
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