2003 Bmw Z4: Reliability Data

Source: NHTSA — 459 complaints
459
Total Complaints
43,000mi
Median Mileage
STEERING
Top Issue
7
Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

24,554 25th Percentile
43,000 Median Mileage
69,091 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

STEERING
325
AIR BAGS
27
ELECTRICAL SYSTEM
13
STEERING:ELECTRIC POWER ASSIST SYSTEM
10
ENGINE AND ENGINE COOLING:ENGINE
6
VEHICLE SPEED CONTROL
6
ENGINE AND ENGINE COOLING
5
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
4
UNKNOWN OR OTHER
4
EQUIPMENT
3

Severity Assessment

7
Crashes
0
Fires
2
Injuries
0
Deaths

Sample Complaint Reports

"THE VEHICLE LOST POWER STEERING, THE MECHANIC STATED THE STEERING GEAR BOX NEEDED TO BE REPLACED. *JB"
"THE VEHICLE WAS TURNED OFF TO FILL WITH GAS, WHEN THE VEHICLE WAS TURNED BACK ON, THE STEERING HAD GONE OUT. THE DEALER HAD REPLACED THE STEERING COLUMN GEAR AND REPROGRAMMED THE EPS AND THE LWS WITH THE CIP V 7.0. MR SCC"
"ENGINE SURGED THEN REVVED UNCONTROLLABLLY AFTER STARTUP. CONTINUED TO SURGE AND IDLE WITH RPM ALTERNATING BETWEEN 0 - 2500 RPM THE ACCELORATOR WAS UNRESPONSIVE.*AK AFTER STARTUP THE CAR SURGED FORWARD. DAMANGE TO FRONT BUMBER AND CRACKED LIGHT RESULTED. DEFECTIVE PART: BAD THROTTLE HOUSING..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28