2003 Chevrolet Impala vs 2003 Mercury Grand Marquis
Complaints, recalls, TSBs, investigations and safety ratings side by side, from official federal data. Last verified Aug 7, 2026. Raw complaint counts are not adjusted for sales volume.
| Metric | 2003 Chevrolet Impala | 2003 Mercury Grand Marquis |
|---|---|---|
| NHTSA complaints | 694 | 362 |
| Recall campaigns | 5 | 1 |
| Service bulletins (TSBs) | 477 | 90 |
| Investigations | 1 | 6 |
| Crash reports | 32 | 22 |
| Fire reports | 32 | 2 |
| NCAP overall rating | — | — |
| EPA MPG (combined) | 20–22 | 18 |
| Median reported incident mileage | 85,000 mi | 87,000 mi |
Reported problems side by side
| Component | Chevrolet Impala | Mercury Grand Marquis |
|---|---|---|
| Electrical System | 264 | 51 |
| Exterior Lighting | 103 | 207 |
| Engine | 88 | 5 |
| Engine and Engine Cooling | 80 | 13 |
| Service Brakes, Hydraulic | 54 | 4 |
| Steering | 30 | 28 |
| Air Bags | 39 | 11 |
| Vehicle Speed Control | 23 | 27 |
Symptoms owners describe
| Won’t start | 69 | 0 |
| Stalling | 56 | 15 |
| Rust / corrosion | 21 | 10 |
| Overheating | 18 | 0 |
| Vibration / shaking | 15 | 5 |
| Check engine light | 12 | 0 |
| Hesitation / surging | 12 | 0 |
| Loss of power | 11 | 0 |
2003 Chevrolet Impala
2003 Mercury Grand Marquis
Compare all Chevrolet Impala vs Mercury Grand Marquis 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.