What breaks most · 2002 to 2016 model years
BMW Z4 problems by year
Owners have filed 1,101 safety complaints with NHTSA about the BMW Z4 across model years 2002 to 2016. Three years stand out: 2003 for steering complaints, 2004 for steering complaints and 2005 for steering complaints. The quietest years are 2013, 2002 and 2014.
- Years to check closely: 2003, 2004, 2005
- Fewest complaints: 2013, 2002, 2014
- Complaints on file
- 11012002 to 2016, all trims
- Worst year
- 2003384 complaints
- Crashes reported
- 147 fires · 5 injuries · 2 deaths
- Typical failure mileage
- 45kMedian where owners gave mileage
- Recall campaigns
- 34Across 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) | |
| 384 | 5 | 4 | Steering (318) | |
| 368 | 1 | 1 | Steering (339) | |
| 171 | 1 | 0 | Steering (158) | |
| 73 | 1 | 2 | Steering (47) | |
| 30 | 3 | 2 | Steering (11) | |
| 12 | 0 | 2 | Steering (5) | |
| 17 | 1 | 4 | Wheels (10) | |
| 8 | 0 | 5 | Engine and cooling (2) | |
| 24 | 1 | 6 | Wheels (7) | |
| 3 | 0 | 3 | Wheels (1) | |
| 4 | 1 | 3 | Fuel system (1) | |
| 2 | 0 | 1 | Exterior lighting (1) | |
| 1 | 0 | 1 | Seat belts (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% |
318 | 2 | Shop all steering parts, not filtered to this vehicle |
| Air bags | 7% |
28 | 1 | Check recalls for air bags on NHTSA.gov |
| Electrical systemAlternators, starters and ignition | 3% |
12 | 1 | Shop electrical system parts for the 2003 BMW Z4 |
| Engine and coolingRadiators, thermostats and cooling | 3% |
10 | 0 | Shop engine and cooling parts for the 2003 BMW Z4 |
| Body and structureDoors, latches and body hardware | 2% |
7 | 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 | 2% |
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.
-
On warm days the steering at higher speed gets hard to steer ; to the point of being unsteady. At lower speeds and cooler temps the hard steering can bs handled but is still troublesome. Need someone to talk to bmw.
-
Steering sticks while driving. Happens at different speeds. Takes effort to "free up the steering wheel" very annoying and dangerous.
-
Steering binds in center position when driving at speed. Small corrections are hard to make as steering resists & then over corrects. Problem is most noticeable during hot weather and has progressively become worse overtime .
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 30, 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 384 complaints, led by steering.
What is the most common BMW Z4 problem?
On the 2003 model year, the most-reported component is steering with 318 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 45,000 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.