One problem related to hydraulic power assist steering system has been reported for the 1998 Mercury Marquis. The most recently reported issues are listed below.
On two occasions whenever vehicle ran over puddle of water it caused the vehicle to lose power steering assist for approimately 20 second or less. Dealer notified.
| Steering Idler Arm problems | |
| Steering Gear Box problems | |
| Hydraulic Power Assist Steering System problems | |
| Steering problems |