One problem related to bumper has been reported for the 2004 BMW 7 Series. The most recently reported issues are listed below.
While driving at 45 mph consumer heard a loud bang outside of the vehicle. Consumer pulled over and inspected the vehicle, but could not find a problem. A day later, the check engine light came on and remained on. Dealer found that the fender cover came off, and could be the cause of the check engine light being on.