2012 Infiniti M37 vs 2012 Kia Optima
Complaints, recalls, TSBs, investigations and safety ratings side by side, from official federal data. Last verified Aug 8, 2026. Raw complaint counts are not adjusted for sales volume.
| Metric | 2012 Infiniti M37 | 2012 Kia Optima |
|---|---|---|
| NHTSA complaints | 30 | 919 |
| Recall campaigns | 0 | 5 |
| Service bulletins (TSBs) | 86 | 241 |
| Investigations | 0 | 7 |
| Crash reports | 1 | 25 |
| Fire reports | 1 | 77 |
| NCAP overall rating | — | 5/5 |
| EPA MPG (combined) | 21 | 26–36 |
| Median reported incident mileage | 62,000 mi | 82,120 mi |
Reported problems side by side
| Component | Infiniti M37 | Kia Optima |
|---|---|---|
| Engine | 6 | 398 |
| Steering | 11 | 188 |
| Electrical System | 3 | 122 |
| Power Train | 5 | 54 |
| Air Bags | 8 | 48 |
| Service Brakes | 2 | 52 |
| Fuel/propulsion System | 1 | 42 |
| Vehicle Speed Control | 2 | 40 |
Symptoms owners describe
| Airbag warning light | 5 | 19 |
| Stalling | 0 | 110 |
| Clunking / rattling | 0 | 74 |
| Check engine light | 0 | 73 |
| Loss of power | 0 | 49 |
| Vibration / shaking | 0 | 32 |
| Hesitation / surging | 0 | 22 |
| Won’t start | 0 | 14 |
2012 Infiniti M37
2012 Kia Optima
Compare all Infiniti M37 vs Kia Optima years →
Method. Complaints are unique NHTSA reports. A vehicle that sold more units will naturally accumulate more complaints — use shares and read the underlying reports before drawing conclusions.