1998 Mercury Grand Marquis vs 1998 Pontiac Bonneville
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 | 1998 Mercury Grand Marquis | 1998 Pontiac Bonneville |
|---|---|---|
| NHTSA complaints | 143 | 277 |
| Recall campaigns | 5 | 1 |
| Service bulletins (TSBs) | 164 | 51 |
| Investigations | 3 | 2 |
| Crash reports | 8 | 9 |
| Fire reports | 8 | 28 |
| NCAP overall rating | — | — |
| EPA MPG (combined) | 18 | 19–20 |
| Median reported incident mileage | 84,700 mi | 71,863 mi |
Reported problems side by side
| Component | Mercury Grand Marquis | Pontiac Bonneville |
|---|---|---|
| Engine and Engine Cooling | 26 | 194 |
| Electrical System | 15 | 28 |
| Fuel System, Gasoline | 7 | 33 |
| Steering | 17 | 7 |
| Power Train | 8 | 13 |
| Exterior Lighting | 16 | 4 |
| Suspension | 16 | 2 |
| Vehicle Speed Control | 9 | 8 |
Symptoms owners describe
| Stalling | 12 | 43 |
| Vibration / shaking | 5 | 0 |
| Overheating | 5 | 24 |
| Check engine light | 0 | 11 |
| Hesitation / surging | 0 | 7 |
1998 Mercury Grand Marquis
1998 Pontiac Bonneville
Compare all Mercury Grand Marquis vs Pontiac Bonneville 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.