One problem related to accelerator pedal has been reported for the 2003 Mercury Marquis. The most recently reported issues are listed below.
Accelerator pedal and brake pedal are located too close together. This would cause a misapplication to the wrong pedal when braking or accelerating, at the same time. Had taken vehicle to dealership, and mechanic could not resolve the problem.
| Vehicle Speed Control problems | |
| Accelerator Stuck problems | |
| Car Accelerates On Its Own problems | |
| Accelerator Pedal problems |