Two problems related to air bag not deploy have been reported for the 2006 BMW Z4. The most recently reported issues are listed below.
Passenger seat occupancy sensor failure. 2006 BMW Z4. Sensor mat failed without stress on the seat. It appears to fail over time. Passenger airbag defaults to off condition. If an accident occurs with a passenger in the car the passenger airbag will not deploy. 2005 and earlier models have been offered a 10 year extended warranty to cover this problem with the same part. No additional warranty has been offered for 2006 models.
Passenger airbag deactivation light always on (since 20,000 miles approx) together with dashboard airbag warning light. Garage diagnosed faulty passenger seat pressure mat and advised passenger airbag would not deploy in the event of an accident. BMW norwell MA, who sold the car to us, stated no recall on 2006 model (conversation with their service dept. Of 10/21/2011) although all Z4s up to 2005 were recalled for mat replacement. BMW were clearly still fitting defective pressure mats in the 2006 models and would appear to be not only jeopardising our safety but also avoiding their responsibilities.