One problem related to headlight switch has been reported for the 1998 Mercury Marquis. The most recently reported issues are listed below.
Headlights failed to operate properly. Consumer states at 18880 miles headlights fogged up on driver's side, passenger's side fogged up at 22704 miles, dealer replaced them, however at 41396 miles headlights fogged again and dealer would not replace.
| Headlights problems | |
| Headlight Concealment Device problems | |
| Headlight Switch problems |