What breaks most · 2002 to 2022 model years
BMW Z4 problems by year
Owners have filed 1,280 safety complaints with NHTSA about the BMW Z4 across model years 2002 to 2022. Three years stand out: 2003 for steering complaints, 2004 for steering complaints and 2005 for steering complaints. The quietest years are 2002, 2016 and 2012.
- Years to check closely: 2003, 2004, 2005
- Fewest complaints: 2002, 2016, 2012
- Complaints on file
- 12802002 to 2022, all trims
- Worst year
- 2003414 complaints
- Crashes reported
- 207 fires · 6 injuries · 2 deaths
- Typical failure mileage
- 46kMedian where owners gave mileage
- Recall campaigns
- 59Across the years shown
Complaints by model year
Raw filings with NHTSA, not adjusted for how many were sold.
| Model year | Complaints | Crashes | Recalls | Most-reported component |
|---|---|---|---|---|
| 4 | 0 | 0 | Steering (3) | |
| 414 | 5 | 4 | Steering (342) | |
| 411 | 1 | 1 | Steering (378) | |
| 190 | 2 | 0 | Steering (172) | |
| 91 | 1 | 2 | Steering (55) | |
| 33 | 3 | 2 | Steering (11) | |
| 19 | 0 | 2 | Air bags (8) | |
| 22 | 1 | 4 | Wheels (11) | |
| 10 | 0 | 5 | Engine and cooling (3) | |
| 46 | 1 | 6 | Steering (13) | |
| 5 | 0 | 4 | Engine and cooling (3) | |
| 7 | 2 | 3 | Electrical system (3) | |
| 7 | 1 | 3 | Electrical system (3) | |
| 5 | 0 | 1 | Electrical system (2) | |
| 4 | 1 | 1 | Speed control and throttle (1) | |
| 5 | 1 | 6 | Engine (2) | |
| 5 | 1 | 6 | Steering (2) | |
| 1 | 0 | 5 | Unknown or other (1) | |
| 1 | 0 | 4 | Electrical system (1) |
What fails on the 2003 BMW Z4
| Component | Share of complaints | Filings | Crashes | Parts for this job |
|---|---|---|---|---|
| SteeringPower steering pumps, racks and hoses | 83% |
342 | 2 | Shop all steering parts, not filtered to this vehicle |
| Air bags | 7% |
31 | 1 | Check recalls for air bags on NHTSA.gov |
| Electrical systemAlternators, starters and ignition | 3% |
13 | 1 | Shop electrical system parts for the 2003 BMW Z4 |
| Engine and coolingRadiators, thermostats and cooling | 3% |
11 | 0 | Shop engine and cooling parts for the 2003 BMW Z4 |
| Body and structureDoors, latches and body hardware | 2% |
8 | 0 | Shop body and structure parts for the 2003 BMW Z4 |
| Powertrain and transmissionTransmission parts | 2% |
7 | 0 | Shop all powertrain and transmission parts, not filtered to this vehicle |
| Speed control and throttleThrottle and pedal sensors | 1% |
6 | 2 | Shop all speed control and throttle parts, not filtered to this vehicle |
| Fuel systemFuel pumps and injectors | 1% |
5 | 0 | Shop fuel system parts for the 2003 BMW Z4 |
One complaint can name more than one component, so shares add to more than 100%. "Unknown or other" is NHTSA's uncategorized bucket and is shown but never ranked.
In owners' words
Complaint narratives as filed with NHTSA, trimmed for length.
-
Steering is binding up, very hard to steer and control. Car starts out running fine after parked in hot weather and restarted it is almost uncontrollable. Looking for corrective action. Only 39,920 miles on car. Would like to use it or sell it, can do neither in current condition. Steering column needed or components
-
Power steering wheel went out of power during a trip at about 70mph. Yellow light at the dashboard went ON then so, car became imposible to drive or so.
-
While driving the vehicle will loose all power steering, and becomes very difficult to steer, warning lamp comes on with a steering wheel and a exclamation point. Has been diagnosed as needing a steering wheel column assembly.
How to read this page
Every figure comes from the National Highway Traffic Safety Administration's public complaint database, which holds every safety-related defect complaint filed by owners since 1995. We refresh it monthly and count each complaint once per component it names. Data through September 6, 2026.
NHTSA only accepts safety-related complaints. Rattles, paint, infotainment bugs and other annoyances are under-reported here, so this page is a map of what fails in ways owners consider dangerous, not a full reliability score.
Counts are raw. Use the year-over-year shape and the component mix, not the absolute numbers. Where a component maps to parts we stock, the row links to that category filtered to the year you are viewing. Air bag and seat belt complaints link to the recall checker instead, because those repairs are almost always covered.
Common questions
Which BMW Z4 years have the most problems?
By NHTSA complaint volume, 2003, 2004, 2005 carry the most filings on the BMW Z4. The 2003 alone has 414 complaints, led by steering.
What is the most common BMW Z4 problem?
On the 2003 model year, the most-reported component is steering with 342 complaints. The table above lists the top components for every year.
At what mileage do BMW Z4 problems start?
The median mileage at failure across all BMW Z4 complaints that include mileage is about 46,000 miles. Older model years skew higher; the per-year figure is in the "at a glance" card.
Are these complaints verified?
No. NHTSA publishes complaints as submitted and does not investigate individual filings. Patterns across hundreds of complaints are meaningful; a single one is not.