One problem related to ignition anti-theft immobilizer/proximity key/sender has been reported for the 2004 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mercury Grand Marquis based on all problems reported for the 2004 Grand Marquis.
The contact owns a 2004 Mercury Grand Marquis. The contact stated that while the vehicle was parked, the contact noticed that the key fob became inoperable. The contact was not able to start up the vehicle with the security warning light illuminated. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 90,000.
| Electrical System problems | |
| Headlights Turn Off While Driving problems | |
| Instrument Panel problems | |
| Dashboard Failed problems | |
| Battery problems | |
| Ignition Anti-theft Immobilizer/proximity Key/sender problems | |
| Instrument Panel Failure problems | |
| Horn Assembly problems |