2004 Mercury Grand Marquis problems & reliability
347 owner complaints filed with NHTSA for the 2004 Mercury Grand Marquis, alongside 1 safety recall campaign. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
9 complaints report injuries (10 injured, 1 deaths reported).
Federal crash records (FARS 2020–2023): 2004 Mercury Grand Marquis vehicles were involved in 47 fatal crashes with 37 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Exterior Lighting | 206 | 59% |
| Steering | 65 | 19% |
| Electrical System | 40 | 12% |
| Vehicle Speed Control | 23 | 7% |
| Engine and Engine Cooling | 10 | 3% |
| Power Train | 9 | 3% |
| Structure | 8 | 2% |
| Visibility | 7 | 2% |
| Air Bags | 6 | 2% |
| Interior Lighting | 6 | 2% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Half of the failures with a reported odometer reading occurred by 82,500 miles (middle 50% between 55,000 and 110,000 miles), based on 277 complaints that included mileage.
Complaints by incident year
What owners report
“The contact owns a 2004 Mercury Grand Marquis. The contact received NHTSA Campaign Number: 15V861000 (Exterior Lighting). The contact stated that while driving at night, the headlights were flickering and became inoperable. Occasionally, the headlights operated as designed. There were no warning lights illuminated…”
Exterior Lighting · filed Aug 29, 2025
“The contact owns a 2004 Mercury Grand Marquis. The contact stated that while the vehicle was parked, the key fob became inoperable. The contact was not able to start the vehicle with the security warning light illuminated. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was…”
Electrical System · filed Aug 4, 2025
“The contact owns a 2004 Mercury Grand Marquis. The contact stated while driving at an undisclosed speed at night, he became aware that the headlights were not functioning properly. No warning lights were illuminated. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired…”
Exterior Lighting · filed Jun 26, 2024
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- Loss of headlights
Preliminary Evaluation PE15028 · opened Aug 10, 2015 · closed Jan 8, 2016 · led to recall 15V861000
- Loss of headlamp/exterior lighting
Defect Petition DP15002 · opened Apr 1, 2015 · closed Aug 11, 2015
- Steering Column Shaft Obstruction
Preliminary Evaluation PE14021 · opened Jul 7, 2014 · closed Nov 21, 2014
- LOSS OF HEADLIGHT FUNCTION
Preliminary Evaluation PE08066 · opened Nov 26, 2008 · closed Mar 24, 2009
- SPARK PLUG EJECTION FROM CYLINDER HEAD
Defect Petition DP05005 · opened Sep 22, 2005 · closed Jan 4, 2006
Technical service bulletins
49 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2004 Mercury Grand Marquis. The 10 most recent:
Some 2000 and newer Ford, Lincoln and Mercury vehicles equipped with aluminum body panels may exhibit corrosion concerns appearing as bubbled and/or peeling paint with or without accompanying white dust. Panel…
TSB 19-2026 · Service Bulletin/Repair Instructions · issued Feb 7, 2019
Some 2000 and newer Ford, Lincoln and Mercury vehicles equipped with aluminum body panels may exhibit corrosion concerns appearing as bubbled and/or peeling paint with or without accompanying white dust. Panel…
TSB 19-2026 · Service Bulletin/Repair Instructions · issued Feb 7, 2019
The Powertrain Control/Emissions Diagnosis (PC/ED) manual has been revised for diagnosing electronic throttle bodies (ETBs). The ETC_ACT and ETC_DSD PIDs should not used to diagnose possible ETB concerns. The IDS has a…
SSM 46085 · Service Bulletin/Repair Instructions · issued Sep 21, 2016
Summary to be provided on a future date.
ASI-45182 · Service Bulletin/Repair Instructions · issued Jun 1, 2015
Ford: see document search button for owner letter. Information regarding the lighting control module extended warranty coverage, for some vehicles, to 15 years or 250,000 miles, whichever occurs first. Model 2003-2005…
CSP-14N01 · Service Bulletin/Repair Instructions · issued Apr 11, 2014
Ford: the lighting control module has extended warranty coverage, on certain vehicles, due to a possible crack on solder joint that connects relay to circuit board. Model 2003-2005 crown victoria, grand marquis. *pe
CSP-14-N-01 · Service Bulletin/Repair Instructions · issued Apr 11, 2014
Some 1997-2008 vehicles equipped with a 4.6l 2v, 5.4l 2v, or 6.8l 2v engine--spark plug thread repair procedure--not covered under new vehicle limited warranty. *nj this includes f-53 motorhome chassis. Updated 2/23/10…
07212 · Service Bulletin/Repair Instructions · issued Oct 1, 2007
Limited slip axle chatter, shudder, binding sensation, or vibration during low speed turning maneuvers. *tt
06216 · Service Bulletin/Repair Instructions · issued Jan 1, 2006
Wds cop kit diagnostic tip - coil on plug (cop) ignition systems - engine misfire or rough running. *tt
041601 · Service Bulletin/Repair Instructions · issued Nov 14, 2005
Safety belt retraction speed. *tt
042421 · Service Bulletin/Repair Instructions · issued Jun 7, 2005
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2004 Mercury Grand Marquis has 1 NHTSA recall campaign — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2004 Mercury Grand Marquis?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Owners most often reported problems around 82,500 miles — budget accordingly if the car is approaching that mileage.