There are 1 owner-reported engine complaints for the 2005 BMW Z4in NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
TL*THE CONTACT OWNS A 2005 BMW Z4. THE CONTACT STATED THAT WHEN TURNING ON THE VEHICLE, THERE WAS AN ABNORMAL NOISE. THE VEHICLE WAS TAKEN TO A DEALER, WHO DIAGNOSED THAT THE BELT TENSIONER NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 42,800.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026