Equal-exposure complaint evidence and changes in the reported problem mix

2003 vs 2004 KIA OPTIMA

NHTSA Consumer Complaints complaints · snapshot 2026-08-21

Share shifts show how a vehicle's problem mix changed. They do not measure reliability, and complaint counts are not normalized for sales volume.

First 275 months on market for each model year

Exposure window calculated through Aug 22, 2026

Age-matched reports

▲ 59.3% more reports in the equal exposure window

NHTSA Consumer Complaints complaints · snapshot 2026-08-21

Component share shift

Bars start at the neutral midpoint. Left means a smaller share; right means a larger share.

View component share data as a table
Component 2003 share 2004 share Share change
FUEL SYSTEM 5.7% 2.2% ▼ 3.5 pts smaller share
VISIBILITY 3.6% 0.5% ▼ 3.1 pts smaller share
ELECTRICAL SYSTEM 10.7% 13.0% ▲ 2.3 pts larger share
AIR BAGS 10.7% 8.5% ▼ 2.2 pts smaller share
SEAT BELTS 0.7% 2.2% ▲ 1.5 pts larger share
SUSPENSION 5.0% 6.3% ▲ 1.3 pts larger share
SERVICE BRAKES 1.4% 2.7% ▲ 1.3 pts larger share
POWER TRAIN 4.3% 3.1% ▼ 1.2 pts smaller share
TIRES not reported 0.9% ▲ 0.9 pts larger share
STEERING not reported 0.9% ▲ 0.9 pts larger share
STRUCTURE 12.1% 13.0% ▲ 0.9 pts larger share
ENGINE 5.0% 4.5% ▼ 0.5 pts smaller share
LANE DEPARTURE not reported 0.5% ▲ 0.5 pts larger share
EXTERIOR LIGHTING 1.4% 1.8% ▲ 0.4 pts larger share
VEHICLE SPEED CONTROL 1.4% 1.8% ▲ 0.4 pts larger share
WHEELS 0.7% 0.5% ▼ 0.3 pts smaller share
UNKNOWN OR OTHER 71.4% 65.9% ▼ 5.5 pts smaller share

NHTSA Safety Recalls recalls · snapshot 2026-08-22

Recall campaigns

2003 2

Campaign components: FUEL SYSTEM, GASOLINE and SUSPENSION

2004 1

Campaign components: SUSPENSION

NHTSA Consumer Complaints complaints · snapshot 2026-08-21

Safety signals

◆ Fires
2 → 3
◆ Injuries
6 → 8