One problem related to turn signal flasher unit has been reported for the 2001 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Mercury Grand Marquis based on all problems reported for the 2001 Grand Marquis.
Turning signal started to flashing really fast, took vehicle to dealer and could not find cause. Engineer repaired lights. Consumer stated that seat belt warning light stopped working right after they fixed turn signal light.
| Exterior Lighting problems | |
| Headlights problems | |
| Turn Signal Flasher Unit problems | |
| Turn Signal problems |