I had the same issue at around 40k miles. Just take your car to the dealer and they'll replace the front passenger seat coushion and sensor for you. There wasn't even a recall going on when it happened to me but they didn't hesitate to replace it.
Quote:
To respond to the problem, BMW said it would extend the warranty to 10 years without any mileage limit for the following vehicles: 2006 6 Series, 2006 3 Series with standard seat, 2004-2005 Z4, 2004-2006 7 Series, 2006 X5, and 2004-2006 5 Series with comfort seats.
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I've got sport seats and still had the problem but I assume they would also cover sport seats if you're out of warranty on you 325 and you have sport instead of standard seats.